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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EFFECTS OF VISCOSITY VARIATION AND COOLING RATES ON CRYSTALLIZATION AND SUBSEQUENT DOUBLE-DIFFUSIVE CONVECTION

Get access (open in a dialog) DOI: 10.1615/IHTC7.3390
pages 363-368

要約

Crystallization experiments were performed with aqueous solution of Na2CO3 and a 50% water-glycerol solution with dissolved Na2CO3. The concentration of Na 2 CO3 in both cases was 17 wt.%. The viscosity of the water-glycerol solution at 0°C was 14.6×10−3 and at 20°C was ×10−3 kg/m-sec. Crystallization was effected by cooling through one side wall of the test tank; four cooling rates were used. At the slowest cooling rate, onset of crystallization in both solutions occurred on the bottom of the tank at locations of lowest shear rather than of the lowest temperature. In the aqueous solution, the onset of crystallization was accompanied by vigorous plume action enhancing the formation of crystals. In the more viscous solution, no such plume action was observed. Horizontal convection layers due to double diffusive effects were observed in the later stages of the experiment in the less viscous solution with all four cooling rates, but in the more viscous solution only with the two rapid cooling rates.