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The evaporation of ice spheres and ice crystals

1966; IOP Publishing; Volume: 17; Issue: 4 Linguagem: Inglês

10.1088/0508-3443/17/4/316

2057-7656

A D Thorpe, B. J. Mason,

Experimental and Theoretical Physics Studies

The rates of evaporation of ice spheres, 0·3-1·8 mm radius, have been measured by direct weighing in air streams of 25-100 cm sec-1 at -3°C and -12°C and over a range of Reynolds numbers of 10-200. The experimental results may be represented in terms of heat and mass transfer coefficients of the form (Nu) = 1·88 + 0·66 (Pr)1/3 (Re)1/2 and (Sh) = 1·88 + 0·66 (Sc)1/3 (Re)1/2 where (Nu), (Pr), (Sh), (Sc) and (Re) are respectively the Nusselt, Prandtl, Sherwood, Schmidt and Reynolds numbers, provided that the diffusion coefficients of water vapour in air are about 7% lower than those given in the International Critical Tables. These results are consistent with those quoted by some other workers for evaporating water drops.