乱流はく離泡における逆流の変動特性と熱伝達促進機構に関する一考察

Translated title of the contribution: Unsteady reverse-flow characteristics and a possible mechanism of high heat-transfer rate in a turbulent separation bubble.

Kyuro Sasaki, Masaru Kiya

Research output: Contribution to journalArticle

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Abstract

Longitudinal velocity fluctuations in the reverse-flow of a separation bubble formed at the leading edge of a blunt flat plate are found to be approximated by a Gaussian distribution. The reverse-flow intermittency I//r is thus represented by the error function of the time-mean value of the local longitudinal velocity divided by its r. m. s. value: the distribution of I//r near the plate is also expressed by the same function of the longitudinal distance relative to the time-mean reattachment point. The frequency of switching of flow directions is uniquely related to I//r. A high heat-transfer rate in the reattaching zone is suggested to be caused by a more frequent renewal of viscous sublayers there than in a more downstream region.

Original languageJapanese
Pages (from-to)2549-2554
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume50
Issue number458
DOIs
Publication statusPublished - Oct 25 1984

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All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Physics and Astronomy(all)
  • Earth and Planetary Sciences(all)

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