In the spray cooling of a heated surface, variations in the surface texture influence the flow field, altering the maximum liquid film thickness, the bubble diameter, vapor entrapment, bubble departure characteristics, and the ability to transfer heat. A new method for determining and designating the surface texture is proposed, and the effects of surface roughness on evaporation/nucleation in the spray cooling flow field studied. A one-dimensional Fourier analysis is applied to determine experimentally the surface profile of a surface polished with emery paper covering a spectrum of grit sizes between 0.3 to 22 μm. Heat transfer measurements for liquid flow rates between 1 to 5 l/h and air flow rates between 0.1 to 0.4 l/s are presented. Maximum heat fluxes of 1200 W/cm2 for the 0.3 μm surface at very low superheats were obtained.
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Surface Roughness and Its Effects on the Heat Transfer Mechanism in Spray Cooling
M. R. Pais,
M. R. Pais
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506
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L. C. Chow,
L. C. Chow
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506
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E. T. Mahefkey
E. T. Mahefkey
Aero Propulsion and Power Laboratory, Wright Research and Development Center, Wright-Patterson Air Force Base, OH 45433
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M. R. Pais
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506
L. C. Chow
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506
E. T. Mahefkey
Aero Propulsion and Power Laboratory, Wright Research and Development Center, Wright-Patterson Air Force Base, OH 45433
J. Heat Transfer. Feb 1992, 114(1): 211-219 (9 pages)
Published Online: February 1, 1992
Article history
Received:
August 1, 1990
Revised:
July 25, 1991
Online:
May 23, 2008
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A commentary has been published:
Discussion: “Surface Roughness and Its Effects on the Heat Transfer Mechanism of Spray Cooling” (Pais, M. R., Chow, L. C., and Mahefkey, E. T., 1992, ASME J. Heat Transfer, 114, pp. 211–219)
A companion article has been published:
Local Heat Transfer in Turbine Disk Cavities: Part II—Rotor Cooling With Radial Location Injection of Coolant
Citation
Pais, M. R., Chow, L. C., and Mahefkey, E. T. (February 1, 1992). "Surface Roughness and Its Effects on the Heat Transfer Mechanism in Spray Cooling." ASME. J. Heat Transfer. February 1992; 114(1): 211–219. https://doi.org/10.1115/1.2911248
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