Experimental studies were conducted to reveal the heat transfer mechanism of impacting water mist on high temperature metal surfaces. Local heat transfer coefficients were measured in the film-boiling regime at various air velocities and liquid mass fluxes. The test conditions of water mist cover the variations of air velocity from 0 to 50.3 m/s, liquid mass flux from 0 to 7.67 kg/m2s, and surface temperature of stainless steel between 525°C and 500°C. Radial heat transfer distributions were measured at different liquid mass fluxes. The tests revealed that the radial variation of heat transfer coefficients of water mist has a similar trend to the air jet cooling. At the stagnation point, heat transfer coefficient increases with both the air velocity and the liquid mass flux. The convective air heat transfer is consistent with the published correlation in the literature. The heat transfer contribution due to the presence of water increases almost linearly with the liquid mass flux. The total heat transfer coefficient can be established as two separable effects, which is the summation of the heat transfer coefficient of air and of liquid mass flux, respectively. This study shows that with a small amount of water added in the impacting air jet, the heat transfer is dramatically increased. The Leidenfrost temperature under water mist cooling was also measured. The Leidenfrost temperature increased with both the air velocity and the liquid mass flux.
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Technical Papers
Heat Transfer of Impacting Water Mist on High Temperature Metal Surfaces
N. Sozbir,
N. Sozbir
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
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Y. W. Chang,
Y. W. Chang
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
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S. C. Yao
e-mail: scyao@cmu.edu
S. C. Yao
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
Search for other works by this author on:
N. Sozbir
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
Y. W. Chang
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
S. C. Yao
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213
e-mail: scyao@cmu.edu
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division October 17, 2002; revision received September 3, 2002. Associate Editor: C. T. Avedisian.
J. Heat Transfer. Feb 2003, 125(1): 70-74 (5 pages)
Published Online: January 29, 2003
Article history
Revised:
September 3, 2002
Received:
October 17, 2002
Online:
January 29, 2003
Citation
Sozbir, N., Chang , Y. W., and Yao, S. C. (January 29, 2003). "Heat Transfer of Impacting Water Mist on High Temperature Metal Surfaces ." ASME. J. Heat Transfer. February 2003; 125(1): 70–74. https://doi.org/10.1115/1.1527913
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