A Simple Correlation for Fluidized Bed-to-Immersed Body Heat Transfer

Abstract

The heat transfer coefficient between a bed and immersed bodies is an important parameter in determining the surface temperature of bodies which affects the rate of combustion, reaction, drying or heat treatment. In this paper the heat transfer coefficient was determined experimentally with a fluidized bed of 56.6 mm diameter for various kinds of bed particles (d_p =0.140.55 mm), temperatures (T_b =2931123 K), and diameters of immersed bodies (d_s =6.3519.05 mm). The following simple correlation for the maximum heat transfer coefficient was obtained :
Nu_smax≡h_smax d_s/k_e=10 d_s0.8 d_p -0.5 (±20%)
[d_s, d_p : m]
where he is the effective thermal conductivity of the bed.