Experimental study of the relation between heat transfer and flow behavior in a single microtube

Shih Che Huang, Osamu Kawanami, Kazunari Kawakami, Itsuro Honda, Yousuke Kawashima, Haruhiko Ohta

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)

抄録

The flow boiling heat transfer in microchannels have become important issue because it is extremely high-performance heat exchanger for electronic devices. For a detailed study on flow boiling heat transfer in a microtube, we have used a transparent heated microtube, which is coated with a thin gold film on its inner wall. The gold film is used as a resistance thermometer to directly evaluate the inner wall temperature averaged over the entire temperature measurement length. At the same time, the transparency of the film enables the observation of fluid behavior. Flow boiling experiments have been carried out using the microtube under the following conditions; mass velocity of 105 kg/m2 s, tube diameter of 1 mm, heat flux in the range of 10 ~ 380 kW/m2 s, and the test fluid used is ionized water. Under low heat flux conditions, the fluctuations in the inner wall temperature and mass velocity are closely related; the frequency of these fluctuations is the same. However, the fluctuations in the inner wall temperature and heat transfer coefficient are found to be independent of the fluctuation in the mass velocity under high heat flux conditions.

本文言語英語
ページ(範囲)193-197
ページ数5
ジャーナルMicrogravity Science and Technology
20
3-4
DOI
出版ステータス出版済み - 9月 2008

!!!All Science Journal Classification (ASJC) codes

  • モデリングとシミュレーション
  • 工学一般
  • 物理学および天文学一般
  • 応用数学

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