ライブラリ登録: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

HEAT TRANSFER MECHANISM IN A THERMALLY STRATIFIED TURBULENT FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC7.900
pages 443-448

要約

Measurements of the streamwise and vertical velocity fluctuations, u and v, and temperature fluctuation, θ, in a thermally stratified flow in an open channel under stable condition were made with two laser Doppler velocimeters and a film probe operated as a resistance thermometer. The result indicates that the ejection motion makes the largest contribution to the total turbulent momentum flux, −uv, whereas the dominant contribution to the total turbulent heat flux, −vθ, comes from the sweep motion in the near-isothermal flow. The intensities of u and v are the largest in the ejection motion, but the intensity of 6 is the largest in the sweep motion. In the stably stratified flow, the buoyancy gives rise to increasing negative contribution to both −uv and −vθ from the inward interaction motion. The intensities of u, v and θ in the inward interaction motion increase also with increasing local Richardson number, Ri. The levels of the intensity of 0 in sweep and ejection motions are reversed when Ri becomes larger than 0.54.