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.
| Translated title of the contribution | Unsteady reverse-flow characteristics and a possible mechanism of high heat-transfer rate in a turbulent separation bubble. |
|---|---|
| Original language | Japanese |
| Pages (from-to) | 2549-2554 |
| Number of pages | 6 |
| Journal | Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 50 |
| Issue number | 458 |
| DOIs | |
| 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)