Publication de 4 numéros par an
ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336
Indexed in
HEAT TRANSFER ENHANCEMENT MECHANISM IN A RECTANGULAR PASSAGE WITH V- AND L-SHAPED RIBS
RÉSUMÉ
Heat transfer measurement and flow visualization tests were performed to investigate heat transfer enhancement mechanisms of angled ribs mounted on two opposite walls of a rectangular passage with turbulent flow. Seven rib configurations were studied: 90°, 60°, 60°V-shaped, 60° L-shaped, and the broken arrangements for these 60° rib configurations.
It was found that the rotational direction of the secondary flow induced by the ribs plays a dominant role in determining the heat transfer performance. If the rotational direction of the secondary flow is to convey fluid from the central core region of a passage directly to the heat transfer wall, the heat-transfer performance of the wall is augmented appreciably.This is attributed to (1) transportation of colder fluid from the core region to the heat transfer wall and (2) suppression of separated regions behind the ribs through the introduction of higher momentum fluid from the core region of the channel.The mechanism clearly showed the heat transfer superiority of V-shaped ribs over L-shaped ribs.The effects of the rib-induced secondary flow are very strong and remain even if the rotation conditions are employed.
-
AL-Hadhrami Luai , Griffith Todd , Han Je-Chin , Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=2) With Five Different Orientations of 45 Deg V-Shaped Rib Turbulators , Journal of Heat Transfer, 125, 2, 2003. Crossref
-
Wright Lesley M. , Fu Wen-Lung , Han Je-Chin , Thermal Performance of Angled, V-Shaped, and W-Shaped Rib Turbulators in Rotating Rectangular Cooling Channels (AR=4:1) , Journal of Turbomachinery, 126, 4, 2004. Crossref
-
Lee Eungsuk, Wright Lesley M., Han Je-Chin, Heat Transfer in Rotating Rectangular Channels with V-Shaped and Angled Ribs, Journal of Thermophysics and Heat Transfer, 19, 1, 2005. Crossref