揮発性2成分過熱溶液中の気泡成長速度

概要

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Numerical results have been obtained for bubble growth rates in uniformly superheated aqueous solutions of ethanol by solving the extended Rayleigh equation and the equation of the bubble wall temperature derived by Plesset and Zwick, by means of a finite difference procedure. From the numerical results it is found that, as the mass fraction of ethanol is increased, the bubble growth rate first increases due to the increase in vapor pressure and then decreases due to the increase in vapor density.<BR>Experimental data on bubble growth rates in aqueous solutions of ethanol under completely constant and uniform superheat conditions have been obtained by a unique experimental method in which the superheated condition was attained by slowly decompressing a pool of solution, and a bubble nucleus was generated on the top of the cathode wire by electrolyzing the superheated solution. In both inertia-controlled and heat transfer-controlled growth regions, the experimental data on bubble growth rates are shown to compare reasonably with both the numerical results and the authors' simplified expression derived previously for superheated pure liquids, showing that the simplified expression is generally valid for superheated solutions of volatile binary components.
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