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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

PARTICLE SCALE STUDY OF HEAT TRANSFER IN GAS FLUIDIZATION

Get access (open in a dialog) DOI: 10.1615/IHTC13.p5.160
12 pages

摘要

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.