Abstract
Abstract Heat transfer and defrosting characteristics of a horizontal single-row array of cooled tubes immersed in a gas-solid fluidized bed, have been studied experimentally. The fluidized bed produces gas-solid particle impinging jets to effectively remove frost layers on the tube surface. It has been verified that frost-free running of the cooled tubes is possible under the conditions of inlet air temperature -7°C, tube surface temperature -7°C and relative humidity 80%. The local contact frequency of particles onto the tube surface was measured by an optical sensing system and the defrosting mechanism of impinging solid particles was observed in detail with a visualization technique.
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