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ACRC Technical Report 106PDF

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Title:Heat Transfer and Pressure Drop in a Developing Channel Flow with Streamwise Vortices
Author(s):Felton, K.C.; Jacobi, A.M.
Subject(s):air-side heat transfer
Abstract:Experiments to assess the heat transfer and pressure-drop effects of delta-wing vortex generators placed at the entrance of developing channel flows are reported in this study. The experimental geometry simulates common heat exchanger configurations and tests are conducted over a velocity range important to heating, air conditioning and refrigeration. An innovative liquid-crystal thermography technique is used to determine the local and average Nusselt numbers for an isoflux channel wall, and conventional methods are used to determine the Fanning friction factor. Vortex generators with aspect ratios of A = 2 and A = 4 are studied at attack angles of a. = 20° to 45°·. The results indicate that the streamwise vortices generated by a delta wing can enhance local Nusselt numbers by more than 200% in a developing channel flow. Under some conditions, the spatially average Nusselt number nearly doubled for a heat transfer area that was 37 to 63 times the wing area. The Fanning friction factor increased by a few percent to nearly 60%, depending on the Reynolds number.
Issue Date:1996-09
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-106
Genre:Technical Report
Type:Text
Language:English
URI:http://hdl.handle.net/2142/11541
Sponsor:Air Conditioning and Refrigeration Project 40
Date Available in IDEALS:2009-04-23
Identifier in Online Catalog:4037785


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