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Technical Briefs

Effect of Channel Orientation on the Heat Transfer Coefficient in the Smooth and Dimpled Rotating Rectangular Channels

[+] Author and Article Information
Seokbeom Kim, Eun Yeong Choi

Mem. ASMEjskwak@kau.ac.kr School of Aerospace and Mechanical Engineering,  Korea Aerospace University, Goyang-city 412-791, Koreajskwak@kau.ac.kr

Jae Su Kwak1

Mem. ASMEjskwak@kau.ac.kr School of Aerospace and Mechanical Engineering,  Korea Aerospace University, Goyang-city 412-791, Koreajskwak@kau.ac.kr

1

Corresponding author.

J. Heat Transfer 134(6), 064504 (May 02, 2012) (5 pages) doi:10.1115/1.4006013 History: Received January 24, 2011; Revised November 11, 2011; Published April 30, 2012; Online May 02, 2012

The detailed distribution of the heat transfer coefficient on rotating smooth and dimpled rectangular channels were measured using the transient liquid crystal technique. The rotating speed of the channel was fixed at 500 rpm and the tested Reynolds number based on the channel hydraulic diameter was 10,000. A stationary surface and two different channel rotating orientations of 90 deg and 120 deg were tested in order to investigate the effects of channel orientation on the distribution of the heat transfer coefficient in smooth and dimpled rotating surfaces. Results show that the heat transfer coefficient on the trailing surface is higher than that on the leading surface. For the 120 deg channel orientation angle cases, a higher heat transfer coefficient was observed near the outer surface. In the dimpled channel, the effect of the Coriolis force induced secondary flow on the heat transfer coefficient was not as significant as that for the smooth channel case.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the test facility

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Figure 2

Configurations of the tested channel

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Figure 3

Schematics of secondary flow pattern in rectangular channel with two channel orientation angles of 90 deg and 120 deg

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Figure 4

Distribution of the Nusselt number ratio

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Figure 5

Effect of channel orientation angle on the streamwise-averaged Nusselt number ratio

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