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 , dimensionless distance between nozzle and impingement surface , frequency , and amplitudes and . 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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Oscillation Effect of Impingement Surface on Two-Dimensional Impingement Heat Transfer
Koichi Ichimiya,
Koichi Ichimiya
Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division,
e-mail: ichimiya@yamanashi.ac.jp
University of Yamanashi
, Takeda-4, Kofu, Yamanashi 400-8511, Japan
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Yutaka Yoshida
Yutaka Yoshida
Tokyo Electric Co. Ltd.
, 25-Shintomi, Futtsu, Chiba 293-0011, Japan
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Koichi Ichimiya
Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division,
University of Yamanashi
, Takeda-4, Kofu, Yamanashi 400-8511, Japane-mail: ichimiya@yamanashi.ac.jp
Yutaka Yoshida
Tokyo Electric Co. Ltd.
, 25-Shintomi, Futtsu, Chiba 293-0011, JapanJ. Heat Transfer. Jan 2009, 131(1): 011701 (6 pages)
Published Online: October 16, 2008
Article history
Received:
October 1, 2007
Revised:
January 27, 2008
Published:
October 16, 2008
Citation
Ichimiya, K., and Yoshida, Y. (October 16, 2008). "Oscillation Effect of Impingement Surface on Two-Dimensional Impingement Heat Transfer." ASME. J. Heat Transfer. January 2009; 131(1): 011701. https://doi.org/10.1115/1.2955474
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