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Technical Briefs

Numerical Analysis of a Two-Dimensional Jet Impinging on an Oscillated Heat Transfer Surface

[+] Author and Article Information
Koichi Ichimiya

Mechanical Systems Engineering Division, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japanichimiya@yamanashi.ac.jp

Shuichi Watanabe

Plant Engineering Division, Tokyo Gas Engineering Co., Ltd., Nishishinjuku 3-7-1, Shinjuku, Tokyo 163-1018, Japan

J. Heat Transfer 131(9), 094505 (Jun 25, 2009) (5 pages) doi:10.1115/1.3139188 History: Received October 29, 2008; Revised April 02, 2009; Published June 25, 2009

Numerical analyses were performed to determine the oscillation effect of an impingement surface on the impingement heat transfer and flow with a confined wall. As a moving boundary problem, two-dimensional governing equations were solved for the Reynolds numbers Re=200 and 500, the Prandtl number Pr=0.71, the dimensionless space between the nozzle and impingement surface H=1.0, and the Strouhal number Sf=01.0. Oscillation induced both the enhancement and depression of the local heat transfer. The local heat transfer was improved at a comparatively low frequency due to the flow fluctuation. On the other hand, at a high frequency, it was depressed due to the flow in an upper direction near the impingement surface. The oscillation effect spatially appeared downstream after the impingement.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Coordinate system

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Figure 2

Dimensionless stream function with oscillation (Re=500, Sf=0.125, A=0.05)

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Figure 3

Temperature field (Re=500, Sf=0.125, A=0.05)

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Figure 4

Local Nusselt number (Re=500, Sfτ=0.25)

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Figure 5

Local Nusselt number ratio (Re=500, Sfτ=0.25)

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