Abstract
A theoretical model to describe the heat transfer between an immersed heater and unrestrained packed or quiescent fluidized bed is presented. The bed was divided into two regions of constant bed voidage and gas velocity. (i) A region of increased voidage close to the heat transfer surface. (ii) The area outside this. Heat transfer was assumed to take place by steady state conduction and effective conductivities were used to characterize the heat transfer in both regions. The predictions of the model agreed with the experimentally measured packed and quiescent bed heat transfer coefficients to within 25%.
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