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순간 증발현상에 관하여 -Flash 증발관내에서 발생한 단일기포의 성장 및 운동에 관한 이론적 연구-

A Study on Flashing Phenomena-Growth and Rising of a Single Bubble in the Superheated Liquid of a Flash Stage-

이재성 이성규

Lee CS Lee S

HWAHAK KONGHAK, August 1980, 18(4), 215-226(12), NONE

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Abstract

균일과열액체내에서 발생한 단일기포에 대하여 운동량, 열, 물질전달의 제관계와 기포벽에서의 평형효과를 고려하여 기포성장및 상승기구를 Model화 하였으며, 비선형연립미분방정식의 수치해를 구하였다. 그 결과로서, 기포성장후기만 아니라, 중·초기에서도 적용시킬 수 있는 성장 및 상승원리를 제시하였으며, 기포내부와 기액경계면, 이력그리고 온도경계층에서의 온도, 압력, 반경의 동특성을 고찰함으로써 단일기포의 이력을 명백히 하였다. 또, 과열도를 변화시켜서 얻은 결과를 비교검토하였다.

The behavior of a vapor bubble growing and rising simultaneously in a uniformly superheated water was formulated taking into account of liquid inertia, heat conduction in the liquid and nonequilibrium effects at the vapor-liquid interface. Neither experimental data nor overall solutions for the bubble behavior in flash stage have been available as yet. Some illustrative numerical solutions for the entire bubble history were obtained for various superheats. A comparison between our theory and other theoretical solutions was also presented and discussed.

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