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Research Papers: Forced Convection

Oscillation Effect of Impingement Surface on Two-Dimensional Impingement Heat Transfer

[+] Author and Article Information
Koichi Ichimiya

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

Yutaka Yoshida

 Tokyo Electric Co. Ltd., 25-Shintomi, Futtsu, Chiba 293-0011, Japan

J. Heat Transfer 131(1), 011701 (Oct 16, 2008) (6 pages) doi:10.1115/1.2955474 History: Received October 01, 2007; Revised January 27, 2008; Published October 16, 2008

This paper describes the oscillation effect of impingement surface on two-dimensional impingement heat transfer with confined wall. The local temperature distribution on an impingement surface was measured using a thermosensitive liquid crystal sheet and an image processor. Experiments were conducted by using air as a working fluid. Experimental conditions were as follows: Reynolds number Re=100010,000, dimensionless distance between nozzle and impingement surface hB=1.04.0, frequency f=0100Hz, and amplitudes a=0.5mm and 1.0mm. The local Nusselt number was improved for the comparatively low Reynolds number and low frequency and was depressed for high frequency. In the case of heat transfer enhancement, vortices on the impingement surface were renewed frequently, and on the other hand, in the case of heat transfer depression, thermal boundary layer thickness increased in appearance by the vibration of the impingement surface.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of experimental apparatus

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Figure 2

Vibration system

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Figure 3

Isothermal lines (°C) (Re=1000, H=1.0, and f=0Hz)

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Figure 4

Corrected heat flux (Re=1000, H=1.0, and f=0Hz)

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Figure 5

Nusselt number along the flow direction (Re=1000, H=1.0, and f=0Hz)

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Figure 6

Nusselt number (H=1.0 and a=1.0mm): (a) Re=1000; (b) Re=10,000

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Figure 7

Nusselt number (H=4.0 and a=1.0mm): (a) Re=1000; (b) Re=10,000

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Figure 8

Nusselt number ratio beneath the nozzle Nuf∕Nuo: (a) Re=1000; (b) Re=10,000

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Figure 9

Dimensionless velocity and turbulence intensity (H=4.0, a=1.0, and Re=2000): (a) f=0Hz; (b) f=10Hz; (c) f=100Hz

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Figure 10

Power spectrum (H=4.0, a=1.0mm, and Re=2000): (a) f=0Hz; (b) f=10Hz; (c) f=100Hz

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Figure 11

Flow visualization: (a) heat transfer improvement (H=4.0, a=1.0mm, f=10Hz, and Re=500); (b) heat transfer depression (H=2.0, a=1.0mm, f=60Hz, and Re=500)

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Figure 12

Flow model: (a) heat transfer improvement; (b) heat transfer depression

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