Author(s): Tom W. Forest; Ravi Sharma
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Abstract: The growth rates of frazil ice discs are predicted from a numerical solution of the quasi-steady energy balance for an axi-symmetric disc. The two cases considered are growth in quiescent and turbulent supercooled water. For the quiescent case, it is shown that the rate at which the disc thickened is much smaller than growth in the radial direction. However, radial growth rates are over-predicted by a maximum of 30% for the range of conditions considered, if disc thickening is neglected. For growth in turbulent water, the calculations show that radial growth rates predicted by empirically determined heat transfer coefficients and a simple convective energy balance seriously under-predict the growth rates. From the numerical results, an area correction factor is calculated that can be used to correct the rates predicted by the convective energy balance. The magnitude of this factor is in the range of 8 to 9, is independent of disc radius, R and supercooling, and weakly dependent on the dissipation scale of turbulence.
Year: 1992