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Date of Publication:2022-10-06

Journal:推进技术

Affiliation of Author(s):运载工程与力学学部

Issue:12

Page Number:1630-1638

ISSN No.:1001-4055

Abstract:Numerical study of flow and heat transfer characteristics in a large aspect ratio rectangular chan?nel with a perforated rib mounted on the bottom surface were performed for the rib height-to-channel hydraulic diameter(e/Dh)and the open area ratio(β)fixed at 0.188 and 0.131 respectively. The effects of non-dimension?al holes height(h/e)and entrance flow Reynolds number on the friction factor and Nusselt number of channel were analyzed. The results show that the perforated rib has a lower friction factor and more uniform surface tem?perature distribution as compared with the solid rib,but its averaged Nusselt number ratio slightly drops. As the holes height elevating, both the friction factor and the temperature field uniformity decrease gradually, while the averaged Nusselt number ratio take on the up-down tendency,so there is an optimal holes height(h/e)opt=0.65 for the thermal performance factor reached its maximum. Similarly to the solid rib,the friction factor slowly decreases and the averaged Nusselt number monotonic increases with the increasing of Reynolds number for the perforated rib.

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