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RESEARCH PAPERS: Heat and Mass Transfer

Detailed Heat/Mass Transfer Distributions in a Rotating Smooth Channel With Bleed Flow

[+] Author and Article Information
Kyung Min Kim, Sang In Kim, 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. Heat Transfer 129(11), 1538-1545 (Mar 10, 2007) (8 pages) doi:10.1115/1.2759974 History: Received November 30, 2006; Revised March 10, 2007

In this study, the effects of bleed flow on heat/mass transfer in a rotating smooth square channel were investigated. The hydraulic diameter (Dh) of the channel was 40.0mm, and the diameter of the bleed holes (d) on the leading surface was 4.5mm. Tests were conducted under various bleed flow rates (0%, 10%, 20%) and rotation numbers (0, 0.2, 0.4), while the Reynolds number was fixed at 10,000. A naphthalene sublimation method was employed to determine the detailed heat transfer coefficients using a heat and mass transfer analogy. The results suggested heat/mass transfer characteristics in the internal cooling passage to be influenced by tripping flow as well as Coriolis force induced by bleed flow and channel rotation. In cases influenced by bleed flow, the heat/mass transfer on the leading surface was higher than that without bleed flow. The heat/mass transfer on the leading surface increased with the number of rotations to Ro=0.2, after which it decreased due to rotation effects.

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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

Schematics of the test section: (a) Geometry of the channel, (b) coordinate system of the leading surface, and (c) coordinate system of the trailing surface

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Figure 3

Local Sh∕Sh0 distributions in the channel without bleed flow: (a)Ro=0.0, (b)Ro=0.2, and (c)Ro=0.4

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Figure 4

Local Sh∕Sh0 distributions in the channel with bleed flow at BR=0.1: (a)Ro=0.0, (b)Ro=0.2, and (c)Ro=0.4

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Figure 5

Local Sh∕Sh0 distributions in the channel with bleed flow at BR=0.2: (a)Ro=0.0, (b)Ro=0.2, and (c)Ro=0.4

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Figure 6

Spanwise Sh ratio distributions at x∕Dh=12.14 in nonbleeding case (BR=0.0): (a) Leading surface and (b) trailing surface

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Figure 7

Spanwise Sh ratio distributions at x∕Dh=12.14 in bleeding case (BR=0.2): (a) Leading surface and (b) trailing surface

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Figure 8

Spanwise averaged Sh∕Sh0 on leading surface: (a)Ro=0.0, (b)Ro=0.2, and (c)Ro=0.4

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Figure 9

Regional averaged heat/mass transfer coefficients (10.5≤x∕Dh≤13.25): (a) Each surface and (b) mean values of both surfaces

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Figure 10

Friction factor ratios at various rotation numbers

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Figure 11

Thermal performance for all tests

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