The problem of turbulent flow past freezing or melting ice is formulated for the case of random boundary waves, with particular attention to the distribution of heat-transfer rate along wavy surfaces. Relations are obtained for the celerity and unsteady spectrum of the boundary waves. The results of 21 laboratory experiments are reported and used to establish the values of certain quantities appearing in the heat-transfer relation adopted. The velocity Reynolds number of the phase shift between the boundary waves and heat-transfer variation is found to have a nearly constant value of 4 × 104.

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