EXPERIMENTAL STUDY ON CRITICAL HEAT FLUX IN LATERALLY NON-UNIFORMLY HEATED RECTANGULAR CHANNELS

概要

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The purpose of this study is to collect new experimental data and to obtain better understanding on critical heat flux (CHF) in narrow rectangular channels heated from one lateral side in comparison with that in channels heated from both sides. Four kinds of test sections were used in the experiment, i.e. rectangular channels heated from one side and both sides with gap thicknesses of 1.0mm and 2.4mm. The results indicated that the CHF for a both-sides heated channel was close to the prediction based on the critical quality taking account of the effect of unheated wall, while the CHF for a onesside heated channel occurred along the churn to annular flow boundary. This indicates that the liquid interchange between the heated and unheated walls due to the passage of liquid slugs has a significant effect on cooling and rewetting of the heated wall, while the liquid interchange in the annular flow is small. The CHF for both-sides heated channels were lower at low mass velocities than that for one-side heated channels, if plotted as a function of mass velocity at a given inlet water temperature, but the difference diminished at higher mass velocities. The difference of CHF at low mass velocities could be attributed to the difference in the flooding CHF.
弓削商船高等専門学校の論文
1998-02-27