Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

Z. Y. Zhou
The University of New South Wales, Sydney, Australia

A. B. Yu
School of Materials Science and Engineering, University of New South Wales, Sydney 2052, AUSTRALIA

P. Zulli
BHP Steel Research Laboratories, PO Box 202, Port Kembla, NSW 2505, Australia

Heat transfer in gas fluidization has been studied at a particle scale by means of an extended DPS-CFD (Discrete Particle Simulation-Computational Fluid Dynamics) approach. The development of this model is described, and its validity is tested by qualitatively comparing the predictions with literature data. The features of this approach are demonstrated. The proposed model considers three heat transfer mechanisms: fluid-particle convection, particle-particle conduction and radiation. The contribution of each mechanism is analyzed under different conditions. The results indicate that for the conditions concerned, the fluid-particle convection heat transfer is always dominant; however, particle-particle conduction heat transfer cannot be ignored, particularly when the gas superficial velocity is not high, e.g. less than minimum fluidization velocity; radiation is not important when the sphere temperature is low. They are in general consistent with the previous findings which are however largely qualitative. The model offers an effective method to elucidate the mechanisms governing the heat transfer in packed and fluidized beds at a particle scale.

PRT-16 pages DOI: 10.1615/IHTC13.p5.160 Download article

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