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The aim of this study is to investigate the effect of gas flow velocity, size of sandparticles, and the distance between tubes immersed in a fluidized bed on heattransfer coefficient. Experimental tests were conducted on a bundle of copper tubesof (12.5 mm) diameter and (320 mm) length arranged in a matrix (17×9) andimmersed in a fluidized bed inside a plastic container. One of the tubes was usedas a hot tube with a capacity of (122 W). (25 kg) of sand with three differentdiameters of sand particles (0.15, 0.3 and 0.6 mm) was used in these tests at tenspeeds for gas flow (from 0.16 m/s to 0.516 m/s). The results showed a significantinverse effect of fluidized bed particles diameter on the heat transfer coefficient.Accordingly, the heat transfer coefficient for (0.15mm) diameter sand was foundto be higher than that of (0.3 mm) and (0.6 mm) sand by about (3.124) and (6.868)times respectively, in all tests. The results showed good agreement with resultsfrom other studies conducted under the same conditions but with different sandparticle size.

Effect of Fluidized Bed Particle Size on Heat Transfer Coefficient at Different Operating Conditions