Dr Subhasish Mitra

Dr Subhasish Mitra

Research Associate

School of Engineering

Career Summary

Biography

Subhasish Mitra is currently a research associate in the Discipline of Chemical Engineering, School of Engineering. Before entering into academic research, he worked for 7 years as a chemical process engineer in the domain of process development, troubleshooting and design in mineral processing, petrochemicals and oil & gas industries.

His present research interests encompass complex multiphase flow systems specifically interfacial flow problems involving droplet and bubble dynamics which primarily form the basis of many process and mineral engineering applications. Of particular interest is understanding the phase interactions in droplet-particle and bubble-particle systems and also associated heat and mass transport process and turbulence wherever applicable.

Research involves use of high speed imaging to capture the small scale interaction dynamics, thermal imaging for temperature measurement, and particle image velocimetry (PIV) for liquid phase velocity measurement; and computational modelling of these interactions using computational fluid dynamics (CFD) and discrete element method (DEM) approach.



Qualifications

  • Doctor of Philosophy, University of Newcastle
  • Bachelor of Technology (Honours), Vidyasagar University West Bengal India
  • Postgraduate Certificate in Nuclear Science & Eng, Bhabha Atomic Research Centre, India
  • Master of Technology, Indian Institute of Technology - Kanpur

Keywords

  • CFD
  • Drops, bubbles and particles
  • Fluid mechanics
  • Heat and mass transfer
  • Image processing
  • Interfacial science
  • Multiphase flow

Languages

  • Bengali (Mother)
  • English (Fluent)
  • Hindi (Fluent)

Fields of Research

Code Description Percentage
091501 Computational Fluid Dynamics 40
091505 Heat and Mass Transfer Operations 40
090406 Powder and Particle Technology 20

Professional Experience

UON Appointment

Title Organisation / Department
Research Associate University of Newcastle
School of Engineering
Australia

Professional appointment

Dates Title Organisation / Department
14/01/2008 - 12/07/2009 Senior Process Engineer

Held responsibility for various process design activities associated with Oil & Gas processing facility which included FEED documents review, preparation of design basis, steady state simulation using Hysys, hydraulic calculations, equipment sizing (2 & 3 phase separators, vessel, tanks, pumps, heat exchanger sizing check with HTRI, column hydraulics check by KG Tower/SULTRAY), de-pressurizing calculations, utility consumption calculations, preparation of PFD, P&ID, Cause & Effect diagram, Process Datasheet preparation for various equipment, sizing of PSV. Familiarity with design standards: SHELL DEP, API 520, 521, 2000 etc. Prepared various utility system design guidelines and compiled a report on gas sweetening methodology for internal use.

Petrofac Engineering India Ltd.
India
17/05/2007 - 16/01/2008 Process Technology Analyst

Provided process solution services (process simulation and optimization) to overseas client (Olefins & Surfactant Division, SASOL North America Inc, Louisiana) on successful operation of heavy alcohol production plant (crude alcohol separation unit, heavy alcohol splitter unit and end product refining unit) from ethylene feed stock.

Ingenero Technologies (India)
India
9/12/2005 - 14/05/2007 Manager (Process)

Involved in operation and troubleshooting of High Density Polyethylene Plant (1, 60,000 MT/yr, (Process Licensor - M/s Basell Polyolefins, Germany) in Indian Petrochemical Corporation Ltd., Bharuch, Gujarat producing nine different types of Blow moulding grade, film grade and pipe grade pellets.

Relaince Industries Ltd.
India
2/09/2002 - 5/12/2005 Scientific Officer

Involved in operation and associated troubleshooting of mineral processing of radioactive ore for intended use as nuclear power reactor Fuel. Additionally was responsible for procurement of plant equipment and instruments which involved technical specifications preparation, techno-commercial evaluation of vendor’s offer and onsite performance testing of the items.

Bhabha Atomic Research Centre
India

Awards

Award

Year Award
2014 Outstanding paper award, Multiphase Flow (Session 1), 10th international conference on heat transfer, fluid mechanics and thermodynamics, (HEFAT), Orlando, Florida, USA
10th international conference on heat transfer, fluid mechanics and thermodynamics, (HEFAT), Orlando, Florida, USA

Scholarship

Year Award
2011 University of Newcastle Postgraduate Research Scholarship (centrally funded) for Ph.D. program
Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
2011 PhD fellowship from Dept. of Petroleum & Geosystem engineering, University of Texas, Austin (USA)
University of Texas At Austin
2009 MHRD scholarship, Govt. of India for M.Tech program
Indian Institute of Technology Kanpur
2001 Department of Atomic Energy (DAE) scholarship, Govt. of India scholarship for postgraduate program in Nuclear Sc.& Engg.
Bhabha Atomic Research Centre
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Book (1 outputs)

Year Citation Altmetrics Link
2011 Mitra S, Computational Fluid Dynamics Modeling of Trickle Bed Reactor Hydrodynamics, Reactor Internals, Catalyst Bed, 160 (2011)

Journal article (21 outputs)

Year Citation Altmetrics Link
2017 Mitra SSK, 'Letter to the Editor: Comment on "Evaporation phenomenon past a rotating hydrocarbon droplet of ternary components"', International Journal of Heat and Fluid Flow, (2017)
DOI 10.1016/j.ijheatfluidflow.2017.07.001
2017 Ghatage SV, Shakhaoath Khan M, Peng Z, Doroodchi E, Moghtaderi B, Padhiyar N, et al., 'Settling/rising of a foreign particle in solid-liquid fluidized beds: Application of dynamic mesh technique', Chemical Engineering Science, 170 139-153 (2017)

© 2017 Elsevier Ltd The modeling of moving objects has been the focus of many studies and has succeeded to attract sufficient attention by researchers. However, commonly used mod... [more]

© 2017 Elsevier Ltd The modeling of moving objects has been the focus of many studies and has succeeded to attract sufficient attention by researchers. However, commonly used modeling approaches such as discrete element modeling (DEM), direct numerical simulations (DNS) lack simplicity and have been computationally intensive. In the present work, simple method of dynamic mesh in the framework of computational fluid dynamics has been employed. Eulerian-Eulerian simulations of a monodisperse solid-liquid fluidized bed (SLFB) have been carried out. A foreign particle (settling particle or rising bubble) was inserted in the system to study the effect of turbulence in SLFB on the motion of settling particle. The operating and geometrical parameters have been chosen based on the experiments performed by Ghatage et al. (2013). The results showed that the model can satisfactorily predict the settling velocity for low voi dage fluidization in 2D as well as 3D simulations. Computational fluid dynamics (CFD) simulations at higher values of superficial liquid velocity showed liquid bubbles confirming the transition to heterogeneous regime. These liquid bubbles directed the settling particle to move zig-zag resulting in lower settling velocity. The size and number of the bubbles increase with an increase in the liquids velocity indicating increased heterogeneity. However, CFD predicted larger and higher number of bubbles than experimentally noted. This resulted in an increase in the deviation of predicted settling velocities from experimentally observed with an increase in superficial liquid velocity. In case of bubbles, it was observed that the dynamic mesh method is greatly dependent on the regime of operation in the column and works only in the range of low voidage when the fluidized bed is homogeneous and does not contain liquid bubbles.

DOI 10.1016/j.ces.2017.01.064
Co-authors Md S Khan, Elham Doroodchi, Geoffrey Evans, Behdad Moghtaderi
2017 Gao Y, Mitra S, Wanless EJ, Moreno-Atanasio R, Evans GM, 'Interaction of a spherical particle with a neutrally buoyant immiscible droplet in salt solution', Chemical Engineering Science, 172 182-198 (2017)

© 2017 Elsevier Ltd The complex interactions of rigid spherical particles with interface (e.g., gas-liquid or liquid-liquid) underpin important industrial applications such as th... [more]

© 2017 Elsevier Ltd The complex interactions of rigid spherical particles with interface (e.g., gas-liquid or liquid-liquid) underpin important industrial applications such as the separation of minerals using flotation method. The objective of the present work was to investigate this interaction process both experimentally and theoretically involving different size of particles (radius¿~¿100¿200¿µm) with varying surface wettability (contact angle¿~¿50¿70°) and a stationary neutrally buoyant immiscible oil-water interface (aniline droplet in salt solution) utilizing high speed imaging technique. The results showed that the particle size significantly affects the collision mechanism wherein collision with particle rebound was noted for larger size particles and collision without particle rebound was noted for the smaller size particles. Increasing surface hydrophobicity of the particles was found to be a governing factor that strongly attaches the particle to interface with immersion depth as high as ~50% of particle radius. Collision polar angle was also noted to be a critical parameter that governs the attachment process. When collision polar angle was increased from 15° to 55°, attachment time was noted to increase by ~2.5 times indicating decreasing probability of attachment. A discrete element model (DEM) was also developed to predict the interaction outcomes with suitable modification of the governing forces. To account for the effect of interface deformation, a spatially dependent capillary force profile was utilised incorporating the effect of interface deformation. The contact force model was modified to produce the collision with/without rebound outcomes. Also, the short range hydrodynamic drag force model was modified using suitable correction factors to account for the resistance in the intervening film between the approaching particle and the interface. Experimentally determined parameters such as droplet-particle separation distance, particle trajectory and velocity were compared with the DEM model predictions and reasonably good agreements were obtained.

DOI 10.1016/j.ces.2017.06.018
Co-authors Roberto Moreno-Atanasio, Geoffrey Evans, Erica Wanless
2017 Mitra SSK, Evans GM, Doroodchi E, Pareek V, Joshi JB, 'Interactions in droplet and particle system of near unity size ratio', CHEMICAL ENGINEERING SCIENCE, (2017)
DOI 10.1016/j.ces.2017.03.059
Co-authors Geoffrey Evans, Elham Doroodchi
2016 Mitra S, Doroodchi E, Evans GM, Pareek V, Joshi JB, 'Interaction Dynamics of a Spherical Particle with a Suspended Liquid Film', AICHE JOURNAL, 62 295-314 (2016) [C1]
DOI 10.1002/aic.15027
Citations Scopus - 2
Co-authors Elham Doroodchi, Geoffrey Evans
2016 Mitra S, Thi BTN, Doroodchi E, Pareek V, Joshi JB, Evans GM, 'On wetting characteristics of droplet on a spherical particle in film boiling regime', CHEMICAL ENGINEERING SCIENCE, 149 181-203 (2016) [C1]
DOI 10.1016/j.ces.2016.04.003
Citations Scopus - 5Web of Science - 3
Co-authors Elham Doroodchi, Geoffrey Evans
2016 Wang G, Nguyen AV, Mitra S, Joshi JB, Jameson GJ, Evans GM, 'A review of the mechanisms and models of bubble-particle detachment in froth flotation', Separation and Purification Technology, 170 155-172 (2016) [C1]

© 2016 Elsevier B.V. Only when the process of particle detachment is well understood and modelled can minerals recovery using the flotation process be modulated to achieve a high... [more]

© 2016 Elsevier B.V. Only when the process of particle detachment is well understood and modelled can minerals recovery using the flotation process be modulated to achieve a high efficiency by suitably changing the operating parameters. This is vitally necessary for the recovery of coarse particles in an energy efficient way, as detachment is the key limiting factor in the successful recovery of large particles. However, until the detachment mechanism is more fully understood, an upper limit on the floatable particle diameter still remains unidentified. To assess the current state of knowledge available in this area, a comprehensive literature review on the mechanisms and models of the bubble-particle detachment process in froth flotation is presented. In general, the detachment process is considered to be a stochastic process, and is usually attributed to the dynamic interactions with the turbulent flow structures (eddies) in the flotation environment which cause particles to detach because of dissipating energy. In this paper, previous studies on bubble-particle detachment have been critically analyzed with respect to the formulation of the models in predicting the detachment probability of particles. The models are classified into three different categories: force balance analysis; energy balance analysis and empirical analysis of particle size compared to maximum floatable particle size. Attention is also paid to an understanding of the mechanisms of bubble-particle detachment in quiescent and turbulent liquid flow fields. The predictions of all these models have been compared with the published experimental data and it was found that models which take an accurate consideration of the influence of eddies on a particle's detachment give the closest predictions. The generally held concept of bubble-particle detachment inside an eddy was experimentally validated, where a particle was observed to rotate on the surface of a bubble, resulting in a centrifugal acceleration 20 times that of gravitational acceleration. The aim of this paper is to review the developments and limitations of the existing models. The experimental work is reviewed so as to reveal the mechanisms of bubble-particle detachment. Therefore, the future development of models is identified in order to successfully predict particle detachment.

DOI 10.1016/j.seppur.2016.06.041
Citations Scopus - 1
Co-authors Geoffrey Evans, Graeme Jameson
2016 Khan MS, Mitra S, Ghatage SWAPNIL, Doroodchi E, Joshi JB, Evans GM, Mitra SSK, 'Segregation and dispersion studies in binary solid-liquid fluidised beds: A theoretical and computational study', POWDER TECHNOLOGY, (2016)
DOI 10.1016/j.powtec.2016.12.070
Co-authors Md S Khan, Geoffrey Evans, Elham Doroodchi
2016 Hoque MM, Mitra S, Sathe MJ, Joshi JB, Evans GM, 'Experimental investigation on modulation of homogeneous and isotropic turbulence in the presence of single particle using time-resolved PIV', Chemical Engineering Science, 153 308-329 (2016) [C1]
DOI 10.1016/j.ces.2016.07.026
Co-authors Mohammad Hoque, Geoffrey Evans
2016 Nguyen TBT, Mitra S, Duong VD, Nguyen VD, Evans GM, 'The effects of variable thermophysical properties on droplet evaporation in high temperature convective flow environment', Journal of Science and Technology, 6 21-24 (2016) [C1]
Co-authors Geoffrey Evans
2016 Khan MS, Mitra S, Ghatage SWAPNIL, Doroodchi E, Joshi JB, Evans GM, 'Segregation and dispersion studies in binary solid-liquid fluidised beds: A theoretical and computational study', Powder Technology, (2016)
DOI 10.1016/j.powtec.2016.12.070
Co-authors Geoffrey Evans, Elham Doroodchi, Md S Khan
2015 Gao Y, Wang G, Evans GM, Wanless EJ, Sathe M, Mitra S, Moreno-Atanasio R, 'Modelling the Motion of a Collected Particle over a Bubble Surface', Procedia Engineering: New Paradigm of Particle Science and Technology Proceedings of The 7th World Congress on Particle Technology, 1346-1355 (2015) [C1]
DOI 10.1016/j.proeng.2015.01.266
Citations Scopus - 3Web of Science - 2
Co-authors Geoffrey Evans, Erica Wanless, Roberto Moreno-Atanasio
2015 Nguyen TTB, Mitra S, Pareek V, Joshi JB, Evans G, 'Comparison of vaporization models for feed droplet in fluid catalytic cracking risers', Chemical Engineering Research and Design, 101 82-97 (2015) [C1]

© 2015. Vaporization of atomized feedstock is one of the critical processes in fluid catalytic cracking (FCC) risers; which is more often ignored in most of the FCC riser modelli... [more]

© 2015. Vaporization of atomized feedstock is one of the critical processes in fluid catalytic cracking (FCC) risers; which is more often ignored in most of the FCC riser modelling studies. In this study, two different vaporization mechanisms of feedstock namely homogeneous mode and heterogeneous mode were studied. Different homogeneous models duly validated for various pure component droplets were applied to predict the vaporization time of the feed droplets typically expected in FCC feed vaporization zone. A new physical model for heterogeneous vaporization considering droplet-particle collision mechanics was also developed in the present study which compared well with the other existing heterogeneous modelling approaches. Comparison of the two vaporization modes indicates that under typical operating conditions of FCC riser, vaporization time of feed droplets predicted by heterogeneous mode is always lower than the homogeneous mode at least by an order of magnitude due to significant increase in heat transfer coefficient which accounts for droplet-particle contact. It is expected that actual vaporization time of feed droplets in an industrial FCC riser should lie in the range predicted by these two vaporization mechanisms which actually set the two limiting modes of vaporization. Obtained results predicted by the models could be used to aid design of the FCC feed vaporization zone.

DOI 10.1016/j.cherd.2015.03.020
Citations Scopus - 5Web of Science - 3
Co-authors Geoffrey Evans
2015 Wang G, Gao Y, Mitra S, Li Y, Zhou S, Evans G, 'Instantaneous bond number for a particle detaching from a bubble', International Journal of Mineral Processing, 142 22-29 (2015) [C1]
DOI 10.1016/j.minpro.2015.03.012
Citations Scopus - 4Web of Science - 2
Co-authors Geoffrey Evans
2015 Hoque MM, Sathe MJ, Mitra S, Joshi JB, Evans GM, 'Comparison of specific energy dissipation rate calculation methodologies utilising 2D PIV velocity measurement', Chemical Engineering Science, 137 752-767 (2015) [C1]

© 2015 Elsevier Ltd. It is critical to have an efficient energy budget in all the industrial process applications involving multiphase flow system where a significant amount of p... [more]

© 2015 Elsevier Ltd. It is critical to have an efficient energy budget in all the industrial process applications involving multiphase flow system where a significant amount of power is invested to achieve a desired outcome such as valuable particle collection and recovery in mineral flotation circuits. In order to achieve this aim there needs to be an ability to properly characterise the energy dissipation in the system; and from this knowledge to develop methodologies so that the supplied energy is distributed suitably among the eddies of different sizes which are responsible for enhancing different transport events such heat/mass transfer, mixing etc. The aim of the study was to obtain the 2D instantaneous velocity field in a homogeneous near isotropic turbulence field using particle image velocimetry (PIV) and then compute the space and time averaged specific energy dissipation rate from velocity field using four different methods, namely: (1) dimensional analysis, (2) velocity gradient, (3) structure function, and (4) energy spectrum. The system was studied in the Taylor Reynolds number range of 24-60, where it was found that the difference between the computed specific energy dissipation rates could be as much as 100 percent. Whilst it was found that there were uncertainties in all four methodologies, it is argued that the energy spectrum method is likely to give the most realistic quantification of the specific energy dissipation rate value since it was shown to satisfy the system energy balance which was not possible to do so for the other three methods. The energy spectrum method also had the added benefit of incorporating integral scale, Taylor microscale and Kolmogorov length scales in the quantification of the specific energy dissipation rate; whereas the other three methods are limited to either integral scale or Taylor microscale only. The limitation of the energy spectrum method, however, is the resolution of the energy spectrum down to the Kolmogorov length scale due to the noise in the measurement; and to resolve this problem a filter was applied to denoise in the dissipation range.

DOI 10.1016/j.ces.2015.06.056
Citations Scopus - 3Web of Science - 2
Co-authors Geoffrey Evans, Mohammad Hoque
2015 Gumulya M, Utikar RP, Pareek V, Mead-Hunter R, Mitra S, Evans GM, 'Evaporation of a droplet on a heated spherical particle', CHEMICAL ENGINEERING JOURNAL, 278 309-319 (2015) [C1]
DOI 10.1016/j.cej.2014.11.024
Citations Scopus - 6Web of Science - 5
Co-authors Geoffrey Evans
2014 Wang G, Sathe M, Mitra S, Jameson GJ, Evans GM, 'Detachment of a bubble anchored to a vertical cylindrical surface in quiescent liquid and grid generated turbulence', Canadian Journal of Chemical Engineering, 92 2067-2077 (2014) [C1]

© 2014 Canadian Society for Chemical Engineering. Turbulence plays a critical role in detachment process of bubble from a solid surface. To investigate this effect, detachment pr... [more]

© 2014 Canadian Society for Chemical Engineering. Turbulence plays a critical role in detachment process of bubble from a solid surface. To investigate this effect, detachment process of a stationary air bubble from a nozzle in both quiescent and turbulent liquid field was studied. A stationary vertical (flat-ended) needle of ID 1.24mm was used as a nozzle to generate a bubble which was anchored to the needle tip. Different sizes of bubbles were generated in quiescent liquid. Volume and contact angle for these bubbles were measured precisely using microscopic imaging technique and correlated. In the quiescent case experiments, a constant contact angle of 90° and bubble diameter of 3.05±0.004mm were obtained consistently. A simple force balance approach was proposed assuming bubble in equilibrium to determine this maximum bubble diameter during detachment. The detached bubble size calculated using this approach agreed fairly well with the experimental results. An oscillating grid device capable of operating at different frequencies was then applied to generate a homogeneous, near-isotropic turbulent velocity field around the anchored bubble. It was observed that for detachment of smaller bubbles, higher turbulence intensity was indeed necessary. The turbulent flow field was quantified using particle image velocimetry (PIV) technique and resolved into flow structures (eddies) of different length scales using a Gaussian filter. It was concluded that smaller eddies perturbed the bubble interface whilst the larger eddies contributed to weakening of the capillary force causing the bubble detachment. Energy dissipation profile obtained from the PIV images indicated significant energy dissipation near the bubble compared to the bulk fluid which supported the fact that strong interactions between bubble and eddies were indeed responsible for bubble detachment.

DOI 10.1002/cjce.22085
Citations Scopus - 5Web of Science - 4
Co-authors Geoffrey Evans, Graeme Jameson
2014 Gumulya M, Utikar RP, Pareek V, Tade MO, Mitra S, Evans GM, 'Modelling of the interaction between a falling n-heptane droplet and hot solid surface', Chemical Engineering Science, 116 23-37 (2014) [C1]

Accurate prediction of the interactions between evaporating liquid droplets and solids are critical for many industrially important processes. A model based on coupled Level Set-V... [more]

Accurate prediction of the interactions between evaporating liquid droplets and solids are critical for many industrially important processes. A model based on coupled Level Set-Volume of Fluid approach was developed to simulate the interaction of evaporating liquid droplets with hot solid surfaces. The model incorporates appropriate source terms in the multiphase calculations to account for the heat and mass transfer. Accurate and stable numerical procedure was developed and incorporated in open source solver OpenFOAM. A brief discussion on the model development along with several key issues that are associated with this process was presented. The resulting numerical model was validated through the experimental data of Chandra and Avedisian (Chandra, S., Avedisian, C.T., 1991. Proc. R. Soc. Lond., Ser. A 432, 13-41). Although some discrepancies were found between the numerical results and experimental data, the model was found to be capable of reproducing the reduced droplet spreading rate as the temperature of the surface is increased away from the saturation temperature. The decrease in rate of surface wetting results from the combined effects of surface tension, viscous forces and evaporation at the liquid-solid-vapour contact line. Further, the effects of increased pressure at the solid-liquid interface resulting from the rapid evaporation of the liquid, which in some cases can be quite severe such that the liquid gets lifted-off from the surface, were also captured, in good agreement with experimental observations. Finally, the effects of the solid temperature on the evaporation and heat transfer rates of the droplets were presented and analysed. © 2014 Elsevier Ltd.

DOI 10.1016/j.ces.2014.04.032
Citations Scopus - 2Web of Science - 2
Co-authors Geoffrey Evans
2013 Mitra S, Doroodchi E, Pareek V, Joshi J, Evans GM, 'Collision behaviour of a small spherical particle on a large stationary droplet', Proceedings. Chemeca 2013, (2013) [E1]
Citations Scopus - 6Web of Science - 3
Co-authors Elham Doroodchi, Geoffrey Evans
2013 Mitra S, Sathe MJ, Doroodchi E, Utikar R, Shah MK, Pareek V, et al., 'Droplet impact dynamics on a spherical particle', CHEMICAL ENGINEERING SCIENCE, 100 105-119 (2013) [C1]
DOI 10.1016/j.ces.2013.01.037
Citations Scopus - 23Web of Science - 22
Co-authors Elham Doroodchi, Geoffrey Evans
2012 Mitra SS, 'Control moisture problems in slurry-based polyolefin operations', Hydrocarbon Processing, 91 77-82 (2012) [C1]
Show 18 more journal articles

Conference (12 outputs)

Year Citation Altmetrics Link
2016 Hoque M, Mitra S, Joshi JB, Evans G, 'Modulation of pressure spectrum properties owing to particle-liquid interaction in oscillating-grid turbulence', The 15th International Workshop on the Physics of Compressible Turbulent Mixing (2016)
Co-authors Geoffrey Evans, Mohammad Hoque
2016 Gao YA, Mitra S, Wanless EJ, Moreno-Atanasio R, Evans GM, 'Interaction of a spherical particle with a neutrally buoyant immiscible droplet in salt solution', CHEMECA 2016: Chemical Engineering - Regeneration, Recovery and Reinvention (2016) [E1]
Co-authors Geoffrey Evans, Erica Wanless, Roberto Moreno-Atanasio
2016 Khan M, Mitra S, Ghatage S, Peng Z, Doroodchi E, Moghtaderi B, et al., 'Pressure drop and voidage measurement in solid-liquid fluidized bed: experimental, mathematical and computational study', CHEMECA 2016: Chemical Engineering - Regeneration, Recovery and Reinvention (2016) [E1]
Co-authors Md S Khan, Elham Doroodchi, Geoffrey Evans, Behdad Moghtaderi
2016 Khan M, Mitra S, Abbasfard H, Peng Z, Doroodchi E, Moghtaderi B, et al., 'Measurement of fluctuating velocities and dispersion behaviour of particles in a solid-liquid fluidised bed', CHEMECA 2016: Chemical Engineering - Regeneration, Recovery and Reinvention (2016) [E1]
Co-authors Md S Khan, Elham Doroodchi, Hamed Abbasfard, Geoffrey Evans, Behdad Moghtaderi
2016 Nguyen TBT, Mitra S, Pareek V, Joshi JB, Evans G, 'Modelling evaporation of mono and binary component alkane droplets in different convective flow conditions.', Proceedings of the 10th Australasian Heat and Mass Transfer Conference, 2016 (2016) [E1]
Co-authors Geoffrey Evans
2015 Khan M, Mitra S, Karim I, Ghatage S, Peng Z, Doroodchi E, et al., 'Bed Expansion Behaviour in a Binary Solid-Liquid Fluidised Bed with Different Initial Solid Loading- CFD Simulation and Validation', Eleventh International Conference on CFD in the Minerals and Process Industries (2015) [E1]
Co-authors Geoffrey Evans, Behdad Moghtaderi, Md S Khan, Elham Doroodchi
2015 Hoque M, Mitra S, Ghatage S, Sathe M, Joshi JB, Evans GM, 'Relating characteristic of turbulence with pressure spectrum using time resolved PIV' (2015) [E2]
Co-authors Mohammad Hoque, Geoffrey Evans
2015 Nguyen TBT, Mitra S, Pareek V, Joshi JB, Evans G, 'Vaporization of binary mixture droplet in hot convective environment' (2015)
Co-authors Geoffrey Evans
2015 Khan M, Mitra S, Ghatage S, Peng Z, Doroodchi E, Moghtaderi B, et al., 'Expansion behavior of binary solid-liquid fluidised bed with different solid mass ratio' (2015) [E1]
Co-authors Geoffrey Evans, Md S Khan, Behdad Moghtaderi, Elham Doroodchi
2013 Mitra SSK, Sathe MJ, Doroodchi E, Pareek V, Joshi JB, Evans GE, 'In-flight collision behaviour of droplets on a spherical particle falling under gravity', 8th World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics (2013) [E1]
Co-authors Geoffrey Evans, Elham Doroodchi
2013 Wang G, Sathe M, Mitra S, Joshi J, Jameson G, Evans GM, 'Influence of grid-generated turbulence on detachment of a bubble anchored to a vertical cylindrical surface: Application to mineral flotation systems', Proceedings. Chemeca 2013 (2013) [E1]
Co-authors Geoffrey Evans, Graeme Jameson
2012 Mitra SS, Sathe MJ, Doroodchi E, Evans GM, 'Investigation of droplet evaporation in a bubbling fluidized bed', Ninth International Conference on Computational Fluid Dynamics in the Minerals and Process Industries (2012) [E1]
Co-authors Elham Doroodchi, Geoffrey Evans
Show 9 more conferences
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Grants and Funding

Summary

Number of grants 4
Total funding $31,500

Click on a grant title below to expand the full details for that specific grant.


20173 grants / $26,500

Strategic pilot grants scheme$19,000

This project aims to support two early career postdoctoral researchers with necessary skill sets from India to carry out a short term computational research work on turbulence modelling bridging research expertise of two research groups in School of Engineering i.e. Prof. Evans (applied turbulence) and Prof. Lyazid (physics of turbulence). The synergistic collaboration is envisaged to address any flow based physical separation system i.e. flotation that is widely used for valuable mineral recovery purpose by adequately modelling the turbulence behaviour. It is planned to apply direct numerical simulation (DNS) method in a simpler flow system to understand the energy transfer mechanism at different length scales which is the key to control phase interactions hence the separation process. Outcome of this project is planned to be utilised in an upcoming ARC DP by the CIs and AR and DECRA proposal for the CI MITRA.

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Project Team

Dr. Subhasish Mitra, Prof. Geoffrey Evans

Scheme FEBE Strategic Pilot Grant
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Internal
Category INTE
UON N

New Staff Grant$5,000

The effect of acoustic pressure field on drops and bubbles to enhance micro-scale mixing

Use of acoustic field on deformable gas-liquid interface has great potential for engineering applications especially in process intensification. Enforcing acoustic field on gas-liquid interface results in volume pulsation which results in non-linear oscillations due to competition between inertia and surface tension force. For bubbles, such shape variations can lead to modulation of flow field around it through bubble induced turbulence involving small rotating flow structures or eddies. The phenomenon could be applied to promote phase interactions in small scale multiphase flow devices i.e. in development of micro-flotation devices to promote bubble-particle contact towards enhanced separation of fine particles. When such external oscillation is applied to droplets, capillary waves appear on the interface which lead to strong internal motion which is conducive to mixing in microfluidic devices where deemed necessary. Both the bubble induced turbulence and degree of mixing can be suitably controlled by varying the frequency and amplitude of the forcing acoustic pulse. Some preliminary studies involving both numerical simulations and experiments have already been conducted which show promising results. The proposed project aims to investigate these acoustic driven interactions for (i) bubble-particle system and (ii) droplet system involving internal mixing in a millimetre size droplet deposited on a surface and droplets in emulsion in microchannel.

 

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Scheme New Staff Grant
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Internal
Category INTE
UON N

Faculty Conference Travel Grant $2,500

Faculty Conference Travel Grant awarded to attend the 13th International Conference on Gas–Liquid and Gas–Liquid–Solid Reactor Engineering (GLS-13), Belgium, 20-23 August to present a paper titled "Interactions in droplet and particle system of near unity size ratio" published in the special issue of Chemical Engineering Science journal.

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Scheme Travel Grant
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Internal
Category INTE
UON N

20161 grants / $5,000

International Partnership Encouragement Grant$5,000

This proposal specifically aims to build a collaborative relationship with the PoreSim research consortium at Louisiana State University, USA for development of expertise in the area of multiscale flow modelling in porous media.

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Project Team

Dr. Subhasish Mitra, Prof. Geoffrey M.Evans, A/Prof. Tom Honeyands

Scheme FEBE support for International Research Visiting Fellowship
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N
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Research Supervision

Number of supervisions

Completed1
Current4

Total current UON EFTSL

PhD1.05

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2017 PhD Research on Macro turbulence and Interface Turbulence Mechanism of Micro-fine Particles Energy Efficiency Improvement in Flotation PhD (Chemical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2016 PhD Drag Force on Bubbles and Particles in Turbulent Flow PhD (Chemical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2013 PhD Vaporisation of Heavier Gas Oil in Droplet Fluid Catalytic Cracking Riser PhD (Chemical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2013 PhD Dispersion Behaviour in Binary Solid-Liquid Fluidised Beds PhD (Chemical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2017 PhD Characterisation of Single and Binary Phase Turbulence in an Oscillating Grid System PhD (Chemical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
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Dr Subhasish Mitra

Position

Research Associate
Research group of Prof.Geoffrey M.Evans
School of Engineering
Faculty of Engineering and Built Environment

Contact Details

Email subhasish.mitra@newcastle.edu.au
Phone (02) 40339208
Mobile 0432150723

Office

Room 310
Building NIER BLOCK A
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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