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Research Papers: Evaporation, Boiling, and Condensation

Gravity Scaling Parameter for Pool Boiling Heat Transfer

[+] Author and Article Information
Rishi Raj

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742rraj@umd.edu

Jungho Kim1

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742kimjh@umd.edu

John McQuillen

 NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135john.b.mcquillen@nasa.gov

1

Corresponding author.

J. Heat Transfer 132(9), 091502 (Jul 06, 2010) (9 pages) doi:10.1115/1.4001632 History: Received October 16, 2009; Revised March 09, 2010; Published July 06, 2010; Online July 06, 2010

Although the effects of microgravity, earth gravity, and hypergravity (>1.5g) on pool boiling heat flux have been studied previously, pool boiling heat flux data over a continuous range of gravity levels (0–1.7 g) was unavailable until recently. The current work uses the results of a variable gravity, subcooled pool boiling experiment to develop a gravity scaling parameter for n-perfluorohexane/FC-72 in the buoyancy-dominated boiling regime (Lh/Lc>2.1). The heat flux prediction was then validated using heat flux data at different subcoolings and dissolved gas concentrations. The scaling parameter can be used as a tool to predict boiling heat flux at any gravity level in the buoyancy dominated regime if the data under similar experimental conditions are available at any other gravity level.

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Figures

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Figure 1

Plot of the heat flux versus acceleration for the high dissolved gas concentration case (cg∼1216 ppm) at ΔTw=44°C, with superimposed bottom view images at 0.01 g, 0.3 g, 0.85 g, and 1.68 g (15)

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Figure 2

Constant temperature microheater array

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Figure 3

CAD model of the experimental package

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Figure 4

Schematic of the parabolic flight trajectory and the corresponding acceleration levels (15)

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Figure 5

Pool boiling curve at various acceleration levels for the high dissolved gas concentration case (∼1216 ppm) with superimposed bottom view images at 0.3 g and 1.7 g

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Figure 6

Plot of the power law coefficient m versus superheat for the two dissolved gas concentrations

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Figure 7

Plot of the power law coefficient m versus nondimensional wall temperature for the two dissolved gas concentrations

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Figure 8

Comparison of the measured and predicted heat flux for the high dissolved gas concentration case (∼1216 ppm) and full heater (7.0×7.0 mm2) at (a) 0.3 g, (b) 0.6 g, (c) 1.3 g, and (d) 1.7 g

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Figure 9

Comparison of the measured and predicted heat flux for the low dissolved gas concentration case (∼220 ppm) and full heater (7.0×7.0 mm2) at (a) 0.3 g, (b) 0.6 g, (c) 1.3 g, and (d) 1.7 g

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Figure 10

Comparison of the measured and predicted heat flux for various heaters sizes and subcoolings: (a) 2.1×2.1 mm2 and 16.6°C, (b) 3.5×3.5 mm2 and 16.6°C, (c) 7.0×7.0 mm2 and 16.6°C, (d) 2.1×2.1 mm2 and 6.6°C, (e) 3.5×3.5 mm2 and 16.6°C, (f) 7.0×7.0 mm2 and 6.6°C (heater 2)

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Figure 11

Comparison of the experimental data and predicted heat flux values using the gravity scaling parameter

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Figure 12

Comparison of the measured and predicted heat flux at two subcoolings (heater 2)

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Figure 13

Comparison of the measured and predicted heat flux for two microheater arrays

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