| 2021 |
Orozovic O, Rajabnia H, Lavrinec A, Alkassar Y, Meylan MH, Williams K, et al., 'A phenomenological model for the pressure drop applicable across both dilute and dense phase pneumatic conveying', Chemical Engineering Science, 246 (2021)
Due to their differences, predictive methods suitable for dilute and dense phase pneumatic conveying are rare in the literature. Conveying trials are often required to characteris... [more] Due to their differences, predictive methods suitable for dilute and dense phase pneumatic conveying are rare in the literature. Conveying trials are often required to characterise a given system, where pressure drop measurements are plotted against gas mass flow rate for various solids flow rates. Empirical curves of constant solids flow are overlaid with measurements and resemble a ¿J¿ shape. This paper presents a model for these curves based on the assumption that the pressure drop is a sum of two terms relating to the gas only influence and a combined gas and solids term. The model is validated for slug flow capable materials, where excellent agreement is obtained. However, it is concluded that the procedure is suitable for fluidised dense-phase capable materials as well. The developed model has the potential to significantly reduce the number of conveying trials required to characterise a pneumatic conveying system.
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| 2021 |
Lavrinec A, Orozovic O, Rajabnia H, Williams K, Jones MG, Klinzing GE, 'An assessment of steady-state conditions in single slug horizontal pneumatic conveying', Particuology, 58 187-195 (2021)
This study used a 3D coupled CFD¿DEM model to assess how slugs tend towards steady state in single slug horizontal pneumatic conveying. Initial slug length, inlet velocity and ini... [more] This study used a 3D coupled CFD¿DEM model to assess how slugs tend towards steady state in single slug horizontal pneumatic conveying. Initial slug length, inlet velocity and initial stationary layer fractions were systematically varied for a total of 72 simulations. Previously made observation that slugs tend towards a steady state was confirmed via a theoretical derivation. The derivation shows that slugs move towards their steady state lengths exponentially. This allowed for a calculation of a characteristic time scale which is a measure of how quickly a slug tends towards the steady state. The theoretical estimate which is a function of slug porosity, steady length, velocity and stationary layer fraction has good agreement with simulated results. A link between steady slug length and solids loading ratio was also shown.
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| 2021 |
Lavrinec A, Orozovic O, Rajabnia H, Williams K, Jones MG, Klinzing G, 'Inertial measurement unit as a tool within dense phase pneumatic conveying. Investigation into velocity measurement accuracy, pressure and velocity relationships in slug flow', Powder Technology, 382 454-466 (2021) [C1]
This paper presents the results of using an inertial measurement unit (IMU) to study various dynamic relationships in horizontal slug flow pneumatic conveying. The accuracy of the... [more] This paper presents the results of using an inertial measurement unit (IMU) to study various dynamic relationships in horizontal slug flow pneumatic conveying. The accuracy of the IMU was assessed and compared to particle image velocimetry (PIV) and once good agreement was confirmed it was used to investigate various aspects of slug flow. Relative movement between core particles and slugs tails and heads was assessed using relative pressures and quantified times spent in a slug. It was found that the propagation of particles backwards through a slug is relatively constant. Pressure-velocity relationship was observed that was theorised to be related to variations in stationary layer ahead of the slugs. Observations of further nuanced features of slug motion are also included to demonstrate the capabilities of IMUs in capturing the many dynamic aspects of the flow.
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| 2021 |
Orozovic O, Lavrinec A, Georgiou F, Wensrich CM, 'A continuum mechanics derivation of the empirical expression relating slug and particle velocities', POWDER TECHNOLOGY, 380 598-601 (2021) [C1]
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| 2020 |
Orozovic O, Lavrinec A, Alkassar Y, Chen J, Williams K, Jones MG, Klinzing GE, 'Insights into horizontal slug flow pneumatic conveying from layer fraction and slug velocity measurements', Powder Technology, 364 218-228 (2020) [C1]
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| 2020 |
Orozovic O, Lavrinec A, Rajabnia H, Williams K, Jones MG, Klinzing GE, 'Transport boundaries and prediction of the slug velocity and layer fraction in horizontal slug flow pneumatic conveying', Chemical Engineering Science, 227 (2020) [C1]
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| 2020 |
Lavrinec A, Orozovic O, Rajabnia H, Williams K, Jones MG, Klinzing G, 'Velocity and porosity relationships within dense phase pneumatic conveying as studied using coupled CFD-DEM', Powder Technology, 375 89-100 (2020) [C1]
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| 2020 |
Ilic D, Lavrinec A, Orozovic O, 'Simulation and analysis of blending in a conveyor transfer system', Minerals Engineering, 157 (2020) [C1]
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| 2019 |
Orozovic O, Lavrinec A, Alkassar Y, Williams K, Jones MG, Klinzing G, 'On the kinematics of horizontal slug flow pneumatic conveying and the relationship between slug length, porosity, velocities and stationary layers', Powder Technology, 351 84-91 (2019) [C1]
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| 2019 |
Lavrinec A, Orozovic O, Williams K, Jones MG, Klinzing G, Clark W, Wang Z, 'Observations of dense phase pneumatic conveying using an inertial measurement unit', Powder Technology, 343 436-444 (2019) [C1]
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