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Investigation into the hydrodynamics of liquid-solid inclined micro-fluidized beds

Lookup NU author(s): Yi Zhang, Nina Ullah, Dr Richard Law, Emeritus Dr David Reay, Dr Vladimir Zivkovic



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


The inclined micro-fluidized bed (MFB) can enhance heat and mass transfer rates compared to the vertically aligned counterparts, but the increased significance of surface forces and wall effects may cause poor fluidization performance. In this paper, the effects of column inclination and different particle-to-bed ratios (dP/dB) on the solid hydrodynamics are investigated in an inclined micro-fluidized bed. The results validated the suitability of using the Ergun equation to predict minimum fluidization velocities due to small deviations between 1.01 and 1.81 times the theoretical values, for a particle-to-bed ratio ranging from 0.025 to 0.165 at inclinations between 0° and 10°. Investigation into the effects on bed expansion behaviour showed that the bed contracted with an increase in bed inclination. An unexpected observation during the bed expansion was the appearance of a secondary high voidage region and the appearance of strong circulation patterns with an increase in bed inclination. A detailed analysis of this phenomenon suggested the presence of a critical angle at 6° and 10° for the 85 µm particles, 4 × 4 mm bed cross-section and 165 µm particles, 1 × 1 mm bed cross-section, respectively. However, the liquid-solid back-mixing was observed due to the modified particle trajectories resulted in the disappearance of the high voidage region. This paper gives new insights into the micro-fluidization behaviour in inclined beds thus contributing to the development of micro-fluidized beds and their future applications.

Publication metadata

Author(s): Zhang Y, Ullah N, Law R, Reay D, Zivkovic V

Publication type: Article

Publication status: Published

Journal: Resources Chemicals and Materials

Year: 2022

Volume: 1

Issue: 1

Pages: 8-15

Print publication date: 01/03/2022

Online publication date: 24/01/2022

Acceptance date: 07/12/2021

Date deposited: 14/01/2022

ISSN (print): 2772-4433

Publisher: KeAi publishing/Elsevier


DOI: 10.1016/j.recm.2021.12.001


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Funder referenceFunder name
Newcastle University (Gant No. LOC/150025720/400382711)