Abstract
The heat transfer characteristics of tube bundles of staggered and inline arrangements subject to a gas-particle cross flow are compared for a range of tube locations, airflow rates, and mean particle diameters. For both tube configurations, mean and local Nusselt numbers can be either enhanced or reduced by the presence of the particles in the flow, with the result depending on the location of the tube within each array and on the Reynolds number and particle size. In most cases, the heat transfer performance of the inline array is found to be more favorable than that of the staggered tube bank. The general trends in heat transfer modification by particles are discussed for each configuration, and specific local differences in performance between the two arrays are examined in some detail. Finally, the implications of the results for the design and selection of heat exchangers to be located in the freeboard region of fluidized bed combustors are discussed.
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