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International Heat Transfer Conference 8

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

WING TYPE VORTEX GENERATORS FOR HEAT TRANSFER ENHANCEMENT

Martin Fiebig
Institut fur Thermo- & Fluiddynamik, Ruhr-Universitat Bochum, Postfach 1021 48, 4630 Bochum 1, GERMANY

P. Kallweit
Institut für Thermo- und Fluiddynamik Ruhr-Universität Bochum

Nimai K. Mitra
Institut für Thermo- und Fluid-dynamik, Ruhr-Universität Bochum, Postfach 102148, 44721 Bochum Germany

DOI: 10.1615/IHTC8.1460
pages 2909-2913

Abstract

Local heat transfer coefficients and friction coefficients have been measured and compared for flows in channels with different built-in vortex generator geometries in the Reynolds number range 1360 to 2270. Delta wings, rectangular wings and winglets have been punched out from the channel wall as vortex generators. The measurements show impressive enhancements of heat transfer coefficients with modest increases in friction coefficients. All investigated types of vortex generators produce heat transfer enhancement. The delta wing shows by far the best performance of all configurations. The increase in friction factor appears to be proportional to the projected cross flow area for all geometries.

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