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RESEARCH PAPERS: Forced Convection

The Effect of Placing Vortex Generators Above Ribs in Ribbed Ducts on the Flow, Flow Temperature, and Heat Transfer Behavior

[+] Author and Article Information
T. A. Myrum, S. Acharya, S. Sinha, X. Qui

Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA 70803

J. Heat Transfer 118(2), 294-300 (May 01, 1996) (7 pages) doi:10.1115/1.2825844 History: Received July 01, 1994; Revised February 01, 1996; Online December 05, 2007

Abstract

Flow temperature and laser-Doppler velocity measurements are presented to understand better the flow and heat transfer behavior resulting from the placement of vortex generators above the first and fifth ribs in a ribbed duct air flow (Re = 3450) and as a benchmark for comparing model predictions. Because the generator–rib spacing, at the smallest spacing (s/h = 0.25), was too small for the flow to pass through it, the generator–rib pair functioned as a single element with an increased effective height, comprising the rib height, the generator–rib space, and the generator proper, which resulted in a downstream shift in the flow reattachment and peak Nusselt number locations. At s/h = 0.75, the flow expanded as it passed through the generator–rib space. Dictated by the upstream flow conditions, the expansion resulted in a vertical downward flow behind the first generator–rib configuration and no vertical downward flow behind the fifth. The vertical downward flow compensated for generator-induced reductions in the near-wall streamwise velocities behind the first generator–rib configuration, resulting in increased local Nusselt numbers, whereas the generator-induced reductions in the streamwise velocities in the absence of the vertical downward flow gave way to reduced Nusselt numbers behind the fifth generator–rib configuration.

Copyright © 1996 by The American Society of Mechanical Engineers
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