Heat transfer from a tube immersed in a fluidized bed with frosting

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Heat Transfer - Japanese Research; (USA)

OSTI ID:6516975

Torikoshi, K; Kawabata, K; Yamashita, H ^[1]

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1. Mechanical Engineering Lab., Daikein Industries, Ltd. (JP)

Heat-transfer and flow-visualization experiments were performed for a single cooled tube immersed horizontally in a fluidized bed under frosting conditions. Measurements were made from local and average heat-transfer coefficients around the cooled tube surface. Glass beads having nominal diameters of 0.43 mm, 0.89 mm, and 1.6 mm were employed as the bed material. The 30 mm diameter tube was located 100 mm above the distributor. All the results obtained under frosting conditions were for an air temperature of about 5{degrees}C and an air relative humidity of about 80 percent. The heat-transfer coefficient with frosting evaluated in this investigation includes the heat-transfer coefficient from the frost surface to the bed and the thermal resistance of the frost layer. Comparisons are made to heat-transfer data without frosting. The heat transfer is found to be larger with frosting than without frosting under the fluidization state.

• OSTI ID: 6516975
• Journal Information: Heat Transfer - Japanese Research; (USA), Vol. 19:1; ISSN 0096-0802
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
MATERIALS
FROST TESTS
TUBES
HEAT TRANSFER
COOLING
FLOW VISUALIZATION
FLUIDIZED BEDS
SURFACES
THERMAL CONDUCTIVITY
ENERGY TRANSFER
MATERIALS TESTING
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
TESTING
THERMAL TESTING
THERMODYNAMIC PROPERTIES
420400* - Engineering- Heat Transfer & Fluid Flow