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Wave formation and heat transfer at an ice-water interface in the presence of a turbulent flow

Published online by Cambridge University Press:  19 April 2006

R. R. Gilpin
Affiliation:
Department of Mechanical Engineering, University of Alberta, Edmonton, Canada
T. Hirata
Affiliation:
Department of Mechanical Engineering, University of Alberta, Edmonton, Canada Present address: Department of Mechanical Engineering, Shinshu University, Nagano, Japan.
K. C. Cheng
Affiliation:
Department of Mechanical Engineering, University of Alberta, Edmonton, Canada

Abstract

Under some conditions of temperature and flow an ice-water interface in the presence of a turbulent stream has been observed to be unstable. In this paper the source and the conditions for the instability were investigated for a well-defined turbulent boundary-layer flow. It was found that the instability resulted from the interaction that occurs between a wavy surface and a turbulent flow over it. Such an interaction results in a heat transfer variation which is 90 to 180 degrees out of phase with the surface wave shape – a result which is consistent with the calculations of Thorsness & Hanratty (1979a, b).

The main factor controlling damping of the instability at an ice-water interface was found to be the rate at which heat is conducted away from the interface into the ice.

In the past it has been found that when an ice layer is melting, that is when the heat conduction in the ice is small, the ice surface is highly unstable. In the present study it was found that for a sufficiently large temperature ratio (TfTw)/(TTf), a steady-state ice layer is also unstable. Furthermore it is predicted, from the present observations, that a growing ice layer with a ratio of ice-side to water-side heat fluxes of up to 2.3 could be unstable.

Under sufficiently unstable conditions waves on the ice surface grow to an amplitude at which flow separations occur near the wave crests. This results in a ‘rippled’ ice surface pattern very similar to the patterns observed on mobile bed surfaces (Kennedy 1969) or surfaces which are being dissolved into a flowing stream (Allen 1971). The development of a ‘rippled’ ice surface results in a very substantial increase in the mean heat-transfer rate which would have an important influence on predictions of ice formation in the presence of a turbulent stream.

Type
Research Article
Copyright
© 1980 Cambridge University Press

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