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Research Papers

Heat/Mass Transfer Characteristics in Angled Ribbed Channels With Various Bleed Ratios and Rotation Numbers

[+] Author and Article Information
Kyung Min Kim, Suk Hwan Park, Yun Heung Jeon, Dong Hyun Lee

Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea

Hyung Hee Cho

Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Koreahhcho@yonsei.ac.kr

J. Turbomach 130(3), 031021 (May 06, 2008) (9 pages) doi:10.1115/1.2777196 History: Received June 07, 2007; Revised June 19, 2007; Published May 06, 2008

The present study investigates the effects of secondary flow due to angled rib turbulators on the heat/mass transfer in the square channels with channel rotation and bleed flow. The angle of attack of the angled ribs was 45deg. The bleed holes were located between the rib turbulators on either the leading or trailing surface. The tests were conducted under the conditions corresponding to various bleed ratios (BR=0.0, 0.2, and 0.4) and rotation numbers (Ro=0.0, 0.2, and 0.4) at Re=10,000. The results suggest that the heat/mass transfer characteristics were influenced by the Coriolis force, the decrement of the main flow rate, and the secondary flow. In the 90deg angled ribbed channel, the heat/mass transfer reduced on the leading surface with an increment in the rotation number, but it increased on the trailing surface. However, it decreased on both surfaces in the 45deg angled ribbed channel. As the bleed ratio increased, the Sherwood number ratios decreased on both the bleeding and nonbleeding surfaces for the 45deg angled ribs but increased on the bleeding surface for the 90deg angled ribs.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Geometry of the test channel with 90deg angled ribs

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Figure 3

Coordinate system of the test section with bleed holes: (a) 90deg angled ribbed channel and (b) 45deg angled ribbed channel

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Figure 5

Pitch averaged Sh∕Sh0 distributions in the 90deg angled ribbed channel: (a) Ro=0.0, (b) Ro=0.4 (bleeding on the leading surface), and (c) Ro=0.4 (bleeding on the trailing surface)

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Figure 4

The local Sh∕Sh0 distributions in the 90deg angled ribbed channel with bleed flow (BR=0.4): (a) Ro=0.0, (b) Ro=0.4 (bleeding on the leading surface), and (c) Ro=0.4 (bleeding on the trailing surface)

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Figure 1

Experimental apparatus

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Figure 12

Thermal performance for all tests

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Figure 11

Friction factor ratios at various rotation numbers

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Figure 10

Mean Sh∕Sh0 of the leading and trailing surfaces

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Figure 9

Regional averaged Sh∕Sh0(10.5⩽x∕Dh⩽13.25) for all the tests in the 45deg ribbed channel

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Figure 8

Pitch averaged Sh∕Sh0 distributions in the 45deg angled ribbed channel: (a) Ro=0.0, (b) Ro=0.4 (bleeding on the leading surface), and (c) Ro=0.4 (bleeding on the trailing surface)

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Figure 7

The local Sh∕Sh0 distributions in the 45deg angled ribbed channel with bleed flow (BR=0.4): (a) Ro=0.0, (b) Ro=0.4 (bleeding on the leading surface), and (c) Ro=0.4 (bleeding on the trailing surface)

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Figure 6

Regional averaged Sh∕Sh0(10.5⩽x∕Dh⩽13.25) for all the tests in the 90deg ribbed channel

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