Heat Transfer and Pressure Drop in a Developing Channel Flow with Streamwise Vortices

Felton, K.C.; Jacobi, A.M.

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https://hdl.handle.net/2142/11541 Copy

Description

Title

Heat Transfer and Pressure Drop in a Developing Channel Flow with Streamwise Vortices

Author(s)

• Felton, K.C.
• Jacobi, A.M.

Issue Date

1996-09

Keyword(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.

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center TR-106

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/11541

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Project 40

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