Abstract
The characteristics of nonisothermal two-phase steady flow in a vertical pipe of constant area were investigated experimentally. Temperature and pressure distributions were determined, and the void fraction was measured under flowing conditions. Aluminum granules of 0.027 in. mean diameter flowed with gravity while heated air was forced countercurrently to the solids flow. Reynolds numbers, based on the superficial air velocity, from 10 to 50 were investigated. The solids flow rate was varied from 472 to 18,900 lbm/hr-sq ft. Utilizing the regeneration principle, the effective length of a fluid-to-particle heat exchanger was determined. Its small value and the large surface area to volume ratio (2980 sq ft/cu ft) indicate that such a heat exchanger would be very compact.
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