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TECHNICAL PAPERS

Effects of Bleed Flow on Heat/Mass Transfer in a Rotating Rib-Roughened Channel

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

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

Hyung Hee Cho

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

J. Turbomach 129(3), 636-642 (Jul 25, 2006) (7 pages) doi:10.1115/1.2720495 History: Received July 18, 2006; Revised July 25, 2006

The present study investigates the effects of bleed flow on heat/mass transfer and pressure drop in a rotating channel with transverse rib turbulators. The hydraulic diameter (Dh) of the square channel is 40.0mm. 20 bleed holes are midway between the rib turburators on the leading surface and the hole diameter (d) is 4.5mm. The square rib turbulators are installed on both leading and trailing surfaces. The rib-to-rib pitch (p) is 10.0 times of the rib height (e) and the rib height-to-hydraulic diameter ratio (eDh) is 0.055. The tests were conducted at various rotation numbers (0, 0.2, 0.4), while the Reynolds number and the rate of bleed flow to main flow were fixed at 10,000 and 10%, respectively. A naphthalene sublimation method was employed to determine the detailed local heat transfer coefficients using the heat/mass transfer analogy. The results suggest that for a rotating ribbed passage with the bleed flow of BR=0.1, the heat/mass transfer on the leading surface is dominantly affected by rib turbulators and the secondary flow induced by rotation rather than bleed flow. The heat/mass transfer on the trailing surface decreases due to the diminution of main flow. The results also show that the friction factor decreases with bleed flow.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Geometry of the test channel

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Figure 3

Coordinate system of the test section: (a) leading surface; (b) trailing surface

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Figure 4

Sh ratio distributions in the ribbed channel at BR=0.0: (a) Ro=0.0; (b) Ro=0.2; (c) Ro=0.4

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Figure 5

Line averaged Sh ratio distributions in the ribbed channel at BR=0.0

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Figure 6

Sh ratio distributions on the leading surface in the smooth channel at BR=0.1: (a) Ro=0.0; (b) Ro=0.2; (c) Ro=0.4

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Figure 7

Sh ratio distributions on the leading surface in the smooth channel at BR=0.1: (a) Sh ratio distributions on the center line; (b) Line averaged Sh ratio distributions

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Figure 8

Sh ratio distributions in the ribbed channel at BR=0.1: (a) Ro=0.0; (b) Ro=0.2; (c) Ro=0.4

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Figure 9

Line averaged Sh ratio distributions in the Ribbed channel at BR=0.1: (a) leading surface; (b) trailing surface

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Figure 10

Regional averaged Sherwood number ratios (10.5⩽x∕Dh⩽13.25)

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Figure 11

Sh ratio distributions on the leading surface in the ribbed channel: (a) Ro=0.0; (b) Ro=0.2; (c) Ro=0.4

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Figure 12

Friction factor ratios at various rotation numbers

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Figure 13

Mean Sherwood number ratios and thermal performance (10.5⩽x∕Dh⩽13.25)

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