Theory on Vaporization and Combustion of Liquid Drops of Pure Substances and Binary Mixtures on Heated Surfaces

概要

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Theory is developed to describe the dynamics of evaporation of liquid drops on heated surfaces. Drops of both the single-component liquid and the binary liquid mixture are treated. Four different regimes of drop evaporation are considered, which are classified according to the mode of heat transfer at the liquid-solid interface : liquidfilm, nucleate-boiling, transition, and spheroidal type evaporation. In addition, drop combustion in the spheroidal stage is treated. Geometry of the liquid drop on the heated surface is also taken into account. Through the application of the principle of conservation of heat, equations are obtained to predict the instantaneous drop size and the vaporization and combustion time. The effects of impact velocity, surface condition and surface material on the vaporization characteristics are determined. The theory is then extended to the analysis of liquid drops consisting of binary-liquid mixtures. Analytical results compare well with the existing experimental data. The fact signifies that the equations which predict heat transfer performance including laminar and forced convection, nucleate pool boiling, critical heat flux for pool boiling and film boiling may also be employed for the performance of the corresponding heat transfer mechanism to the vaporization of liquid drops on heated surfaces.
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