Abstract
AbstractHeat transfer to a gas‐solids suspension flowing cocurrently downward in a 13‐mm inside diameter tube with uniform heat‐flux boundary conditions was investigated using 329‐μm spherical glass beads in air. The gas Reynolds number varied from 0 to 30,000 with solids‐loading ratios of up to 20 at a gas Reynolds number of 10,000. The suspension Nusselt number, defined in terms of the wall‐to‐gas mixed‐mean temperature difference, decreased with increasing solids‐loading ratio at high Reynolds numbers, while it changed little from the value for gas alone at low Reynolds numbers. A possible explanation is given by considering the effects of particles on the fluid mechanical properties of the gas. Asymptotic Nusselt numbers in downflow are compared with results of other investigations for upflow.
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