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Research Papers

Heat Transfer in Rotating Channel With Inclined Pin-Fins

[+] Author and Article Information
Jun Su Park, Kyung Min Kim, 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

Minking Chyu

Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261

J. Turbomach 133(2), 021003 (Oct 19, 2010) (8 pages) doi:10.1115/1.4000553 History: Received July 16, 2009; Revised September 05, 2009; Published October 19, 2010; Online October 19, 2010

This study is to examine experimentally the effects of pin inclination and pin height-to-diameter ratio on the heat/mass transfer characteristics in a pin-fin channel with and without rotation. The test model consists of staggered pin-fin arrays with an interpin spacing of 2.5 times of the pin-diameter (S/D=2.5) in both longitudinal and transverse directions. Detailed local heat/mass transfer coefficients on the two principal surfaces of rotating channel are measured using the naphthalene sublimation technique. The inclined angles (θ) studied are 60 deg and 90 deg. The pin height-to-diameter ratio (Hp/Dp) ranges from 2 to 4. The Reynolds number is fixed at 7.0×103 with two rotation numbers (0.0 and 0.2). The measured data show that the overall array heat/mass transfer decreases with the angle of inclination relative to the vertical orientation. The overall array averaged as well as the row-resolved heat/mass transfer increases with an increase in Hp/Dp. Rotation generally results in higher heat/mass transfer than the corresponding stationary case. The nonuniformity or redistribution of heat/mass transfer induced by the Coriolis force generally perceived in a ribbed or smooth channel is less evident in a pin-fin channel.

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Figures

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Figure 1

Experimental apparatus (18)

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Figure 2

Schematic view of pin-fin arrays

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Figure 3

Distribution of ShL/Sh0 for stationary channel with various heights at θ=60 deg and 90 deg: (a) Hp/Dp=2, leading, θ=60 deg; (b) Hp/Dp=3, leading, θ=60 deg; (c) Hp/Dp=4, leading, θ=60 deg; (d) Hp/Dp=2, trailing, θ=60 deg; (e) Hp/Dp=3, trailing, θ=60 deg; (f) Hp/Dp=4, trailing, θ=60 deg; (g) Hp/Dp=2, θ=90 deg(17); (h) Hp/Dp=3, θ=90 deg(17); and (i) Hp/Dp=4, θ=90 deg(17)

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Figure 4

Schematic of flow patterns around a cylinder confined between endwalls with a finite inclined angle (11)

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Figure 5

ShL/Sh0 on the leading surface at y/Dp=0 and Hp/Dp=2.0 for θ=60 deg

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Figure 6

ShL/Sh0 on the trailing surface at y/Dp=0 and Hp/Dp=4.0 for θ=60 deg

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Figure 7

ShA/Sh0 on the leading and trailing surfaces of a stationary channel with various heights of pin-fins at θ=90 deg(17)

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Figure 8

ShA/Sh0 on the leading surface of a stationary channel with various heights of pin-fins at θ=60 deg

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Figure 9

ShA/Sh0 on the trailing surface of a stationary channel with various heights of pin-fins at θ=60 deg

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Figure 10

Distribution of ShL/Sh0 in a rotating channel at Hp/Dp=3.0, θ=60 deg, and Ro=0.2: (a) leading surface and (b) trailing surface

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Figure 11

Distribution of ShL/Sh0 in a rotating channel at Hp/Dp=3.0, θ=90 deg, and Ro=0.2(17): (a) leading surface and (b) trailing surface

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Figure 12

ShL/Sh0 at y/Dp=0 and Hp/Dp=3.0 for θ=60 deg: (a) leading surface and (b) trailing surface

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Figure 13

ShA/Sh0 on the trailing surface of a rotating channel at Hp/Dp=3.0, θ=60 deg, and Ro=0.2

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Figure 14

ShA/Sh0 on the trailing surface of a rotating channel at Hp/Dp=3.0, θ=90 deg, and Ro=0.2(17)

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