Heat excange between a fluidised bed and an immersed cylinder: estimation of local heat transfer coefficient

This work reports experimental results on the local heat transfer coefficient on the surface of a horizontal cylinder immersed in a fluidised bed. Experimental runs are carried out at ambient pressure and temperature on several bed materials. The heat transfer coefficient is mainly related to particle convective mechanisms and it is the highest on the lateral surface of the cylinder and the lowest on its upper face. The maximum heat transfer coefficient results from an optimal compromise between the local values of the particle concentration and velocity on the exchange surface.