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Research Papers

Extensive Parametric Study of Heat Transfer to Arrays of Oblique Impinging Jets With Phase Change

[+] Author and Article Information
Robert A. Buchanan

e-mail: rbuchanan@wisc.edu

Timothy A. Shedd

e-mail: shedd@engr.wisc.edu
Multiphase Flow Visualization and Analysis
Laboratory,
University of Wisconsin—Madison,
1500 Engineering Drive, Madison,
WI 53706

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received July 17, 2012; final manuscript received January 15, 2013; published online September 23, 2013. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 135(11), 111017 (Sep 23, 2013) (13 pages) Paper No: HT-12-1376; doi: 10.1115/1.4024625 History: Received July 17, 2012; Revised January 15, 2013

This work presents the single- and two-phase results of a parametric study investigating the performance of oblique jet arrays impinging at 45 deg on a 3.63 cm2 square copper heater surface using R-245fa. It was found that the parameters that most impact heat transfer changed as the system progressed from single- to two-phase flow behavior. The single-phase performance was governed by the jet geometry and the volumetric flow rate, while in the two-phase region, heat transfer performance was primarily affected by the fluid conditions and the heat flux applied. A single-phase correlation was developed to capture the low heat flux response, and the two-phase results were well-correlated by a pool boiling correlation. A new general correlation for jet impingement heat transfer with phase change is presented combining these correlations. Critical heat flux (CHF) data were compared with literature correlations and a new correlation was developed for arrays of boiling jets.

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Figures

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Fig. 1

Schematic of test facility

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Fig. 2

(a) Section view of the modeled test section, shown without insulation or nozzles, (b) bottom view of a nozzle plate with tubular nozzles installed in a 3 × 3 pattern, (c) nozzle plate top view: pattern geometry, and (d) nozzle plate side view: nozzle geometry

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Fig. 3

Heat transfer data: H = 3.5 mm (a) 4 × 2 pattern, j = 0.28 lpm/cm2; (b) 4 × 4 pattern, j = 0.28 lpm/cm2; (c) 2 × 4 pattern, Tinlet = 20 °C; and (d) 3 × 3 pattern, Tinlet = 20 °C

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Fig. 4

Single-phase data: (a) Effect of volumetric flux, H = 3.5 mm; (b) effect of number of jets, j = 0.28 lpm/cm2, H = 3.5 mm; (c) effect of impingement distance, 4 × 2 pattern, dn = 0.28 mm, H = 6.7 mm; and (d) effect of submerged height, 4 × 2 pattern, dn = 0.28 mm, L = 2.3 mm

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Fig. 5

Comparison of single-phase correlations: predicted Nusselt number versus the experimental Nusselt number using (a) the literature correlations and (b) the new single-phase correlation

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Fig. 6

Agreement of the new correlation versus the single-phase literature data from Michna et al. [32]

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Fig. 7

Effect of fluid parameters, 4 × 2 pattern, dn = 0.28 mm, L = 4.4 mm, H = 3.5 mm; (a) effect of inlet liquid temperature, j = 0.28 lpm/cm2 and (b) effect of volumetric flux, Tinlet = 20 °C

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Fig. 8

Effect of geometrical parameters, Tinlet = 20 °C; (a) effect of jet diameter, j = 0.14 lpm/cm2, 3 × 3 pattern, L = 2.3 mm, H = 3.5 mm; (b) effect of impingement distance, j = 0.28 lpm/cm2, 4 × 2 pattern, dn = 0.28 mm, H = 6.7 mm; (c) effect of submerged height, j = 0.28 lpm/cm2, 4 × 2 pattern, dn = 0.28 mm, L = 2.3 mm

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Fig. 9

(a) Capturing the two-phase heat transfer with the Cooper [39] correlation, (b) asymptotically matching the single-phase and two-phase correlation with z = 5, and (c) agreement between the new correlation and the experimental data

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Fig. 10

(a) Agreement between CHF correlations and the experimental data and (b) CHF as a function of Reynolds number at Tinlet = 20 °C

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