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Research Papers: Electronic Cooling

Investigation of Heat Transfer and Pressure Drop of an Impinging Jet in a Cross-Flow for Cooling of a Heated Cube

[+] Author and Article Information
D. Rundström

Division of Energy and Mechanical Engineering, Department of Technology and Build Environment, University of Gävle, 801 76 Gävle, Sweden; Department of Mechanical Engineering, Linköping University, Linköping, Swedendrm@hig.se

B. Moshfegh

Division of Energy and Mechanical Engineering, Department of Technology and Build Environment, University of Gävle, 801 76 Gävle, Sweden; Department of Mechanical Engineering, Linköping University, Linköping, Swedenbmh@hig.se

J. Heat Transfer 130(12), 121401 (Sep 22, 2008) (13 pages) doi:10.1115/1.2969266 History: Received May 09, 2007; Revised July 03, 2008; Published September 22, 2008

The objective of this study is to investigate the thermal performance and the cost measured in pressure drops of a targeted cooling system with use of an impinging jet in combination with a low-velocity channel flow on a heated wall-mounted cube. The effects of the Reynolds numbers of the impinging jet and the cross-flow, as well as the distance between the top and bottom plates, are investigated. A steady-state 3D computational fluid dynamics model was developed with use of a Reynolds stress model as turbulence model. The geometrical case is a channel with a heated cube in the middle of the base plate and two inlets, one horizontal channel flow and one vertical impinging jet. The numerical model was validated against experimental data with a similar geometrical setup. The velocity field was measured by particle image velocimetry and the surface temperature was measured by an infrared imaging system. This case results in a very complex flow structure where several flow-related phenomena influence the heat transfer rate and the pressure drops. The average heat transfer coefficients on each side of the cube and the pressure loss coefficients are presented; correlations for the average heat transfer coefficient on the cube and the pressure loss coefficients are created.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

x-velocity components (U/Uj) in the xz-plane, y/H=2/15: — represents RSM and ○ represents measurement

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Figure 8

Paths from the simulation with Uj/Uc=10/2.3 and H=30 mm

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Figure 9

Paths from the case with Uj/Uc=6/1 and H=18.75 mm

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Figure 10

Paths from the case with Uj/Uc=6/2.3 and H=18.75 mm

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Figure 11

Average heat transfer coefficient on the sides and the average value of all sides of the cube. ∗, average; +, top; ×, front; ▽, rear; ◻, sides; and ○, correlation.

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Figure 16

Pressure loss coefficient, Cj, of the impinging jet

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Figure 17

Evaluation of the correlations for the pressure loss coefficient, Cj, of the impinging jet

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Figure 1

Computational domain and a schematic sketch of the heated cube

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Figure 2

Computational grid for the height, H, of 30 mm: perspective view (left) and side view (right)

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Figure 3

Schematic sketch of the experimental setup

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Figure 4

Contours of velocity magnitude in the xy-plane, z/h=0: RSM (left) and PIV measurement (right)

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Figure 5

x-velocity components (U/Uj) in the xy-plane, z/h=0: — represents RSM and ○ represents PIV measurement

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Figure 7

Surface temperature in the xy-plane, z/h=0 (left) and in the xz-plane, y/h=0.5 (right)

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Figure 12

Flow pattern for different ratios of the Reynolds numbers, Rej/Rec, for all three heights

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Figure 13

Evaluation of the correlations for the average heat transfer coefficient, hcorr, of all sides of the cube

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Figure 14

Pressure loss coefficient, Cc, of the cross-flow

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Figure 15

Evaluation of the correlations for the pressure loss coefficient, Cc, of the cross-flow

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