Abstract
This paper has dealt with direct contact heat exchange characteristics between ice water slurry (average ice particle diameter: 3.10 mm) and warm air bubbles as a heat transfer medium. The warm air bubbles ascending in the layer fluidized the ice water slurry layer, and the bubbles were cooled down directly by the ice water slurry. The following results were obtained from the experiment. In case of ice water slurry layer, the warm air bubbles fluidized the layer in earlier stage and heat exchange performance was higher than using ice particles layer. The maximum temperature efficiency increased as Reynolds number Re increased because fluidity in the layer became active and kept at the fixed value in the region of Re≥900. Dehumidity efficiency increased as modified Stefan number and Re increased since the heat capacity of inlet air and heat transfer coefficient increased. Some empirical correlations for temperature efficiency, dehumidity efficiency and the completion time of melting were derived in terms of various nondimensional parameters.
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