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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

## Abstract

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

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)

Figure 12

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

Figure 1

Experimental apparatus (18)

Figure 2

Schematic view of pin-fin arrays

Figure 4

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

Figure 5

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

Figure 6

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

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)

Figure 8

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

Figure 9

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

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

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

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)

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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