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Research Papers

Influence of Radial Rotation on Heat Transfer in a Rectangular Channel With Two Opposite Walls Roughened by Hemispherical Protrusions at High Rotation Numbers

[+] Author and Article Information
Shyy Woei Chang1

Thermal Fluids Laboratory, National Kaohsiung Marine University, 142 Haijhuan Road, Nanzih District, Kaohsiung City, Taiwan 81143, R.O.C.swchang@mail.nkmu.edu.tw

Tong-Miin. Liou

Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C.

Wei-Chun Chen

Department of Marine Engineering,National Kaohsiung Marine University

1

Corresponding author.

J. Turbomach 134(1), 011010 (May 26, 2011) (10 pages) doi:10.1115/1.4003231 History: Received September 02, 2010; Revised October 12, 2010; Published May 26, 2011; Online May 26, 2011

Detailed heat transfer distributions over two opposite leading and trailing walls roughened by hemispherical protrusions were measured from a rotating rectangular channel at rotation number up to 0.6 to examine the effects of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers on local and area-averaged Nusselt numbers (Nu and Nu¯) using the infrared thermography. A set of selected heat transfer data illustrates the Coriolis and rotating buoyancy effects on the detailed Nu distributions and the area-averaged heat transfer performances of the rotating channel. The Nu¯ for the developed flow region on the leading and trailing walls are parametrically analyzed to devise the empirical heat transfer correlations that permit the evaluation of the interdependent and individual Re, Ro, and Bu effect on Nu¯.

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Figures

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Figure 1

Heat transfer test module

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Figure 2

Typical Nu0 distributions on the enhanced surface roughened by hemispherical protrusions

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Figure 3

Variations of Nu¯0 and Nu¯0/Nu¯∞ against Re

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Figure 4

Nu distributions over leading and trailing walls at Re=5000, Ro=0.4 with two different Bu

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Figure 5

Nu distributions on leading and trailing walls at Ro=(a) 0.1, (b) 0.2, (c) 0.3, (d) 0.4, and (e) 0.5 with Re=5000

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Figure 6

Nu distributions on leading and trailing walls at Re=5000, Ro=0.5 with four ascending Bu

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Figure 7

Variations of Nu¯/Nu¯0 against Ro at rotating channels enhanced by various HTE devices

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Figure 8

Variations of Nu¯/Nu¯0 against Bu at fixed Ro for (a) leading and (b) trailing walls

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Figure 9

Variations of ψ1 and ψ2 against Ro for the leading and trailing walls

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Figure 10

Comparison of correlation results for Nu¯/Nu¯0 over leading and trailing walls with experimental data

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Figure 11

Variations of Nu¯/Nu¯∞ against Ro at rotating channels enhanced by various HTE devices

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