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Research Papers: Jets, Wakes, and Impingment Cooling

Supersonic Two-Phase Impinging Jet Heat Transfer

[+] Author and Article Information
Richard R. Parker

Graduate Student
e-mail: parkerrr@ufl.edu

James F. Klausner

Professor
Fellow ASME
e-mail: klaus@ufl.edu

Renwei Mei

Professor
Mem. ASME
e-mail: rwmei@ufl.edu
Department of Mechanical
and Aerospace Engineering,
University of Florida,
Gainesville, FL 32611

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received June 2, 2011; final manuscript received April 2, 2012; published online December 26, 2012. Assoc. Editor: Frank Cunha.

J. Heat Transfer 135(2), 022201 (Dec 26, 2012) (9 pages) Paper No: HT-11-1286; doi: 10.1115/1.4007408 History: Received June 02, 2011; Revised April 02, 2012

The experimental heat transfer rates from a supersonic two-phase impinging air jet with disperse droplets are presented. The experimental configuration consists of an expanding disperse mixture of air and water through a converging–diverging nozzle, designed for Mach 3.26 with a liquid to air mass flow ratio ranging from 1.28% to 3.83%, impinging upon a thin film heater constructed of nichrome. The spatially varying heat transfer coefficient is measured, and peak values are on the order of 200,000W/m2K. Two distinct regions of heat transfer are identified, one dominated by the jet impingement flow and another dominated by thin film heat transfer. The heat transfer coefficient of an impinging jet with dry air and no droplets is measured during the investigation as well. The heat transfer results are compared, and it is demonstrated that the addition of disperse water droplets to the jet significantly increases the heat removal capability of the jet as well as smoothing the spatial temperature distribution of the heater surface. As much as an order of magnitude increase in heat transfer coefficient is observed near the centerline of the jet and a factor of 3–5 increase is seen at a distance of approximately 4 nozzle diameters from the jet. The fundamental heat transfer coefficient measurements should benefit applications involving supersonic two-phase jets for high heat flux thermal management.

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References

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Figures

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Fig. 1

Jet impingement facility

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Fig. 2

Heater assembly and temperature measurement

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Fig. 3

Correlating single-phase jet NuD with r/D and ReD. (a) NuD(r/D) and (b) NuD/ReD(r/D).

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Fig. 4

Radial variation of single-phase jet NuD for different nozzle heights and ReD

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Fig. 5

Heater thermocouple temperature profiles for single-phase jet and different heat fluxes

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Fig. 6

Radial variation of two-phase jet NuD for different water mass fractions

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Fig. 7

Variation of two-phase jet NuD for different nozzle heights

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Fig. 8

Heater thermocouple temperature profiles for two-phase jet and different heat fluxes

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Fig. 9

Variation of heat transfer enhancement factor with water mass fraction and ReD

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Fig. 10

Comparison of single-phase (w = 0) and two-phase heat transfer coefficient

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Fig. 11

Variation of heat transfer enhancement factor for different nozzle heights

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