This is the second of a two-part study on the flow structure and heat transfer characteristics of turbulent, free-surface liquid jets. Part 2 deals with the effect of selected nozzle configurations on the local heat transfer in the stagnation zone. Infrared techniques have been used to characterize the local heat transfer for the four nozzle configurations whose mean and turbulent flow structure was detailed in Part 1. The results show that for identical jet Reynolds numbers, significant differences exist in the magnitudes of the local Nusselt number for the nozzle types studied. Differences of approximately 40 percent were observed. Local heat transfer results reveal that for already turbulent jets, the mean radial velocity gradient appears to be more influential in determining the heat transfer than incremental changes in the level of turbulence (as measured by the radial component of the fluctuations). An empirical correlation of the experimental data supports this conclusion, and reveals that the stagnation Nusselt number is affected independently by the jet Reynolds number and the dimensionless mean radial velocity gradient.
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Effect of Nozzle Configuration on Transport in the Stagnation Zone of Axisymmetric, Impinging Free-Surface Liquid Jets: Part 2—Local Heat Transfer
Y. Pan,
Y. Pan
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
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J. Stevens,
J. Stevens
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
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B. W. Webb
B. W. Webb
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
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Y. Pan
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
J. Stevens
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
B. W. Webb
Heat Transfer Laboratory, Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602
J. Heat Transfer. Nov 1992, 114(4): 880-886 (7 pages)
Published Online: November 1, 1992
Article history
Received:
December 1, 1991
Revised:
June 1, 1992
Online:
May 23, 2008
Citation
Pan, Y., Stevens, J., and Webb, B. W. (November 1, 1992). "Effect of Nozzle Configuration on Transport in the Stagnation Zone of Axisymmetric, Impinging Free-Surface Liquid Jets: Part 2—Local Heat Transfer." ASME. J. Heat Transfer. November 1992; 114(4): 880–886. https://doi.org/10.1115/1.2911896
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