An experimental investigation has been performed to study the effect of flow intermittency on convective heat transfer to a planar water jet impinging on a constant heat flux surface. Enhanced heat transfer was achieved by periodically restarting an impinging flow and thereby forcing renewal of the hydrodynamic and thermal boundary layers. Although convective heat transfer was less effective during a short period when flow was interrupted, high heat transfer rates, which immediately follow initial wetting, prevailed above a threshold frequency, and a net enhancement occurred. Experiments with intermittent flows yielded enhancements in convective heat transfer coefficients of nearly a factor of two, and theoretical considerations suggest that higher enhancements can be achieved by increasing the frequency of the intermittency. Enhancements need not result in an increased pressure drop within a flow system, since flow interruptions can be induced beyond a nozzle exit. Experimental results are presented for both the steady and intermittent impinging jets at distances up to seven jet widths from the stagnation line. A theoretical model of the transient boundary layer response is used to reveal parameters that govern the measured enhancements. A useful correlation is also provided of local heat transfer results for steadily impinging jets.
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Convective Heat Transfer Enhancement Due to Intermittency in an Impinging Jet
D. A. Zumbrunnen,
D. A. Zumbrunnen
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
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M. Aziz
M. Aziz
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
Search for other works by this author on:
D. A. Zumbrunnen
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
M. Aziz
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
J. Heat Transfer. Feb 1993, 115(1): 91-98 (8 pages)
Published Online: February 1, 1993
Article history
Received:
March 30, 1992
Revised:
July 7, 1992
Online:
May 23, 2008
Citation
Zumbrunnen, D. A., and Aziz, M. (February 1, 1993). "Convective Heat Transfer Enhancement Due to Intermittency in an Impinging Jet." ASME. J. Heat Transfer. February 1993; 115(1): 91–98. https://doi.org/10.1115/1.2910675
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