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Technical Briefs

Heat Transfer Enhancement in Channel Flow Using an Inclined Square Cylinder

[+] Author and Article Information
Dong-Hyeog Yoon, Choon-Bum Choi

Department of Mechanical Engineering, Inha University, Incheon 402-751, Republic of Korea

Kyung-Soo Yang1

Department of Mechanical Engineering, Inha University, Incheon 402-751, Republic of Koreaksyang@inha.ac.kr

1

Corresponding author.

J. Heat Transfer 131(7), 074503 (May 06, 2009) (4 pages) doi:10.1115/1.3090808 History: Received May 10, 2008; Revised December 13, 2008; Published May 06, 2009

Heat transfer enhancement in channel flow by using an inclined vortex generator has been numerically investigated. A square cylinder is located on the centerline of laminar channel flow, which is subject to a constant heat flux on the lower channel wall. As the cylinder is inclined with some angle of attack with respect to the main flow direction, flow characteristics change downstream of the cylinder, and significantly affect heat transfer on the channel wall. A parametric study has been conducted to identify the cause, and to possibly find the optimal inclination angle. It turns out that the increased periodic fluctuation of the vertical velocity component in the vicinity of the channel walls is responsible for the heat transfer enhancement. The large fluctuation is believed to be induced by the large-scale vortices shed from the inclined square cylinder, as well as by the secondary vortices formed near the channel walls.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow configuration; (a) boundary conditions, (b) grid system

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Figure 2

Comparison of (a) mean drag coefficient and (b) Strouhal number, over a range of Reynolds number for h/H=0.125 and h/H=0.2, θ=0 deg

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Figure 3

Instantaneous streamlines and temperature contours, ReH=500; (a) channel flow without a cylinder, (b) θ=0 deg, (c) θ=15 deg, (d) θ=30 deg, and (e) θ=45 deg

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Figure 4

Distribution of vrms′; ReH=500, y/H=0.1

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Figure 5

Normalized mean Nusselt number for various inclination angles

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Figure 6

Distribution of (a) mean friction coefficient and (b) rms of friction-coefficient fluctuation for ReH=500

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