DSpace university logo mark
Japanese | English 

NAOSITE : Nagasaki University's Academic Output SITE > 060 工学部・工学研究科 > 060 紀要 > 長崎大学大学院工学研究科研究報告 > 第43巻 第80号 >

種々の端面形状を有する垂直円柱まわりの膜沸騰(第2報: 膜沸騰下限界点)

ファイル 記述 サイズフォーマット
43_80_2.pdf321.12 kBAdobe PDF本文ファイル

タイトル: 種々の端面形状を有する垂直円柱まわりの膜沸騰(第2報: 膜沸騰下限界点)
その他のタイトル: Film Boiling around Vertical Cylinders with End Surfaces of Various Configurations (2nd Report: Lower Limit Point of Film boiling)
著者: 茂地, 徹 / 山田, たかし / 桃木, 悟 / 豊田, 香 / 山口, 朝彦 / 半田, 修也
著者(別表記) : Shigechi, Toru / Yamada, Takashi / Momoki, Satoru / Toyoda, Kaoru / Yamaguchi, Tomohiko / Handa, Shuya
発行日: 2013年 1月
出版者: 長崎大学大学院工学研究科 / Graduate School of Engineering, Nagasaki University
引用: 長崎大学大学院工学研究科研究報告, 43(80), pp.9-14; 2013
抄録: The wall superheat at the lower limit of film boiling of a vertical finite-length silver cylinder, ΔTmin, was determined experimentally by quenching method for saturated and subcooled water at atmospheric pressure. Five kinds of cylinders were tested where the end surface is flat, hemispherical or conical. The following results were obtained from the experiments. (a) For a cylinder with flat end surfaces, ΔTmin has an average value of 136 K for saturated water, irrespective of the aspect ratio, L/D, where L is the length and D the diameter of the test cylinder. ΔTmin increases linearly with an increase in liquid subcooling, ΔTsub, and exceeds always the thermodynamic limit of liquid superheat (about 225K) for water at atmospheric pressure for ΔTsub larger than 12K. This tendency is similar to the cases of a sphere and a horizontal cylinder obtained experimentally by Dhir and Purohit, and Nishio and U emura, respectively. (b)For five kinds of cylinders with various end configurations, ΔTmin is irrespective of the end configurations for saturated water. However, in subcooled water, Δ Tmin of the cylinder with flat end surfaces has a larger value than those with a hemispherical or conical end surface.
キーワード: Lower Limit of Film Boiling / Wall Superheat / Vertical Cylinder / Bottom and Top Configurations
URI: http://hdl.handle.net/10069/30498
ISSN: 18805574
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher
出現コレクション:第43巻 第80号

引用URI : http://hdl.handle.net/10069/30498



Valid XHTML 1.0! Copyright © 2006-2015 長崎大学附属図書館 - お問い合わせ Powerd by DSpace