気液対向流形式沸騰管内の限界熱流束の解析的研究

概要

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For a heated vertical tube which is connected with an upper liquid reservoir and closed at the bottom end, countercurrent annular flow is analyzed to disclose the cause of its critical heat flux. An equation governing the liquid film flow subject to the frictional resistance of both the tube wall and the core vapor flow is derived and thereby the thickness of the film can be determined. It is then found that there is a limiting condition for the existence of real roots of the equation which appears at the upper end of the tube with increasing heat flux. Physically, it is based on the character of the shear stress on the liquid/vapor interface that its magnitude increases with the liquid film thickness when the core vapor flow is turbulent. This limit is shown to agree well with the experimental critical heat flux condition obtained for water and R-113.
一般社団法人日本機械学会の論文
1992-03-25