Experimental investigation and numerical simulation of heat transfer in quenching fluidised beds Online publication date: Thu, 06-Oct-2005
by W.M. Gao, L.X. Kong, P.D. Hodgson
International Journal of Materials and Product Technology (IJMPT), Vol. 24, No. 1/2/3/4, 2005
Abstract: Fluidisation characteristics at different surfaces of a work-piece of complex geometry are conducted in a fluidised bed at various conditions including fluidising number, bed temperature and fluidising medium. The quenching of the work-piece is performed experimentally. In particular, the major frequency and energy of the pressure fluctuations are measured as a function of either fluidising velocity or heat transfer position and the results are used to develop a mathematic model. A computational model is developed to simulate gas dynamics and heat transfer between the fluidised bed and the work-piece surface, as well as simulating the temperature within the work-piece. The predicted cooling curves are in good agreement with the experimental results. Based on the simulation results, the flow characteristics of the gas and the temperature of the dense gas-solid phase near the work-piece surface are analysed to understand the heat transfer mechanism in the fluidised bed.
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