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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v9.i1.40
pages 69-85

EVAPORATION OF A SALT WATER DROP WITH CRYSTALLIZATION

Izumi Taniguchi
Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo, Japan
Tsuguo Inoue
Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo, Japan
Koichi Asano
Department of Chemical Engineering, Tokyo Institute of Technology, Tokyo, Japan

ABSTRACT

Simultaneous measurements for weight loss and temperature history of an evaporating pendant salt-solution drop into dry air were made for a wide range of air flow rates, ambient temperatures, and initial salt concentrations. The effect of crystallization of salt on the rates of evaporation of an aqueous sodium chloride and potassium chloride solution drop into dry air was examined. The presence of salt crystals was first observed near the front stagnation point, which took a major role in mass transfer of a single drop, and the formation of crystals occurred before the average salt concentration reached the equilibrium value. The dimensionless gas-phase diffusion fluxes of water vapor were affected by the vapor-pressure depression and the decrease in effective surface area caused by crystal growth of inorganic salt. A new simulation method for evaporation of an aqueous salt-solution drop into dry air during crystallization of salt was proposed, and the results were in better agreement with the observed data.


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