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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

ONSET OF NATURAL CONVECTION AND HEAT TRANSFER IN A LAYER OF WATER BELOW MELTING ICE

Get access (open in a dialog) DOI: 10.1615/IHTC8.1000
pages 1799-1804

Sinopsis

Incipience of natural convection and steady state heat transfer rates are determined experimentally in a creeping vertical water flow of circular cross-section bounded from above by melting ice and from below by a heated plate pervious to the flow. For these purposes the location of the ice-water interface is automatically kept in place and the plate at constant temperature. Observation of sudden changes in the behavior of the system while incrementally varying the bottom temperature yields data including hysteresis effects associated with the onset of cellular convection. Once stationary conditions are achieved in the mixed flow, dominated by free convection, the heat transfer rates in dependence of water height and plate temperature are derived from the measured flow rates of the melted ice and various flow patterns and structures of the interface discerned. Considering the density anomaly, a stability analysis based upon a modified Galerkin technique predicts the onset of natural convection, the applicability of which is corroberated by the experimental findings, and permits meaningful correlations of the measured data in terms of dimensionless groups.