Optical Observation of Pool Boiling in Cooling Channels
In this paper, the phenomena of pool boiling and formation of flow convection in the cooling channels are observed by an optical method. The laser schlieren method with helium-neon laser of 7mW and a high speed camera with maximum shooting speed of 10, 000 frames per second are used to observe the f...
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Published in | TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Vol. 28; no. 3; pp. 160 - 166 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN
1993
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Online Access | Get full text |
ISSN | 0389-2441 1880-0408 1880-0408 |
DOI | 10.2221/jcsj.28.160 |
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Abstract | In this paper, the phenomena of pool boiling and formation of flow convection in the cooling channels are observed by an optical method. The laser schlieren method with helium-neon laser of 7mW and a high speed camera with maximum shooting speed of 10, 000 frames per second are used to observe the fast phenomena. Analyzing films, transient formations of the flow convection have been observed. A bubble cluster with the thickness of around a hundred μm boundary layer has been formed during first 10ms and after that a turbulent layer has developed. The phenomena of the overshooting of the flow convection have been observed during heating. The flow velocity induced from the elapsing time till the overshooting becomes at maximum is almost equal to the predicted flow velocity calculated from the energy conservation law. |
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AbstractList | In this paper, the phenomena of pool boiling and formation of flow convection in the cooling channels are observed by an optical method. The laser schlieren method with helium-neon laser of 7mW and a high speed camera with maximum shooting speed of 10, 000 frames per second are used to observe the fast phenomena. Analyzing films, transient formations of the flow convection have been observed. A bubble cluster with the thickness of around a hundred μm boundary layer has been formed during first 10ms and after that a turbulent layer has developed. The phenomena of the overshooting of the flow convection have been observed during heating. The flow velocity induced from the elapsing time till the overshooting becomes at maximum is almost equal to the predicted flow velocity calculated from the energy conservation law. |
Author | ITO, Toshiaki FUCHINO, Shuichiro TAMADA, Noriharu NATORI, Naotake |
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References | 7) A. Khalil, et al.: Cryoenics 21 (1981) 411 2) M. N. Wilson: Liquid Helium Technology, Proc. Int. Inst. Refrig. Commun. I (1966) 109 1) S. G. Sydoriak and T. R. Roberts: J. Appl. Phys. 28 (1956) 143 4) S. Lehongre, et al.: Proc. ICEC 2 (1968) 274 5) 佐藤新太郎, 尾形久直: 低温工学 12 (1977) 2 9) 塩治震太郎: 伝熱工学の基礎, オーム社, 東京 (1982) 164 6) H. Ogata and W. Nakayama: Adv. Cryog. Eng. 27 (1982) 309 8) 低温工学ハンドブック編集委員会編: 低温工学ハンドブック, 内田老鶴圃新社, 東京 (1982) 542 3) 平田郁之, 小俣虎之助: 低温工学 3 (1968) 120 |
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Title | Optical Observation of Pool Boiling in Cooling Channels |
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