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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

LARGE EDDY SIMULATION OF TURBULENT HEAT TRANSFER IN A DIMPLED CHANNEL

Get access (open in a dialog) DOI: 10.1615/IHTC13.p1.220
10 pages

要約

Large eddy simulation (LES) data are presented which describe flow and heat transfer characteristics in a dimpled channel. The ratios of dimple depth and channel height to the dimple print diameter are 0.2 and 0.5, respectively. The bulk Reynolds number is 20,000. Dimples are arranged on a side of the channel in a staggered array. LES predicts quantitatively well the local Nusselt number distribution, which has not been reproduced by RANS or other turbulence models. Heat transfer rate is enhanced because all three components of velocity fluctuations are intensified along the shear layer above the recirculation bubble in the dimple. The urms is locally maximized on the wall around the downstream rim of the dimple while the wrms does around the reattachment point. The instantaneous flow and thermal fields show that the heat transfer in the dimpled channel is enhanced by the vortices generated at the shear layer.