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.
|Number of pages||6|
|Journal||Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|Publication status||Published - Oct 25 1984|
All Science Journal Classification (ASJC) codes
- Fluid Flow and Transfer Processes
- Physics and Astronomy(all)
- Earth and Planetary Sciences(all)