Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

COHERENT STRUCTURE IN THE NEAR WAKE FROM A HEATED OR UNHEATED CIRCULAR CYLINDER IMMERSED IN A STABLY STRATIFIED FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC11.3220
pages 305-310

Abstrakt

The effects of thermal stratification on the flow of a stratified fluid past a heated circular cylinder were examined in a wind tunnel. Turbulent intensities, r.m.s. values of temperature, and turbulent convective heat flux distributions in heated cylinder wake with and without thermal stratification were measured by using a hot-wire and cold-wire combination probe. A phase averaging method was also used to estimate coherent motion in the near wake.
The results show that the stratification affects slightly the turbulent flow field in the near wake where coherent motion is dominant. The coherent structure of the temperature field makes a large contribution to the time mean values like velocity coherent motion. The coherency of the temperature fluctuations are very different depending on the experimental conditions. However, the coherent motion of the velocity fluctuations are quite similar for all experimental conditions.