著者

大久保 英敏 西尾 茂文

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.79, no.4, pp.497-503, 1993-04-01

被引用文献数

1

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To predict mist cooling heat transfer, it is necessary to understand systematically this phenomena. However, since there are many parameters affecting mist cooling heat transfer and the effects of these parameters are very complicated, it is still a difficult task to predict mist cooling heat transfer for actual systems. In the present paper, the effect of surface diameter on mist cooling heat transfer was experimentally investigated. To do this, the diameter of test plates was varied from 10 to 30mm. Mist cooling experiments were conducted for horizontal upward-facing surfaces made of silver. The experimental results obtained in this study show that the diameter of the plate affects the heat transfer coefficient of mist cooling in the high-temperature region corresponding to the film boiling region on the boiling curve. Next, the correlating equations for the heat transfer characteristics of mist cooling in the high-temperature region are developed accounting for the effects of volumetric droplet flow rate and surface parameters including the effect of the surface diameter. These correlating equations are in good agreement with a number of experimental data.

著者

西尾 茂文 坂口 和貴

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.53, no.490, pp.1781-1787, 1987-06-25

被引用文献数

1

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This paper presents experimental results on the real value of the minimum-heat-flux (MHF) -point temperature for subcooled pool boiling of water from a horizontal cylinder and an advanced form of the correlation for subcooled film-boiling heat-transfer proposed in the previous paper. First, experiments to observe the collapse process of film boiling were conducted by using a high speed video. The experimental results show that the collapse mode is classified into the propagative collapse with a precursory local-collapse and the coherent collapse. Second, the propagation velocity of collapse front and the mean surface temperature upon the local collapse followed by the propagative collapse were measured. The experimental results show that, for higher propagation-velocities, the MHF-point temperature decreases and approaches the value upon coherent collapse which has only a slight dependence on liquid subcooling. Finally, an advanced form of the correlation for subcooled film-boiling heat-transfer reported in the previous paper is proposed. This equation is in good agreement with the present data of of water at subatmospheric pressures and the existing data of liquid sodium and freon R-11 at atmospheric pressure and pressurized water.