微小幅加熱面のバーンアウト熱流束

概要

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The present paper deals with size effects upon burnout heat flux on a heated ribbon. Saturated water was boiled on an upfacing heated ribbon under atmospheric pressure. The length and the width of the ribbon were varied over a wide range, and burnout heat flux variation with the ribbon width was studied experimentally. The departure diameter and the hovering period of a vapor mass, which may both be closely related to burnout heat flux, were measured using a video tape recorder and an electric resistance probe. The experimental results show that with decreasing ribbon width, burnout heat flux increases while the departure diameter, as well as the hovering period, decreases. The theoretical analysis developed for the motion of a vapor mass explains well the experimental results of departure diameter as well as those of hovering period. However, the variation of burnout heat flux cannot be explained by only the variation of hovering period. Two possible mechanisms of burnout are proposed and discussed based on the suppression of macrolayer formation and the microlayer contribution to heat transfer. A different character of burnout heat flux on heated wires is also discussed.
社団法人日本機械学会の論文
1993-07-25