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Research Papers

Effect of Jet Position on Cooling an Array of Heated Obstacles

[+] Author and Article Information
Hussein M. Maghrabie

Mem. ASME
Department of Mechanical Engineering,
Faculty of Engineering,
South Valley University,
Al Shoban Al Moslemin Street,
Qena 83521, Egypt
e-mail: Hussein_mag@eng.svu.edu.eg

M. Attalla

Department of Mechanical Engineering,
Faculty of Engineering,
South Valley University,
Al Shoban Al Moslemin Street,
Qena 83521, Egypt
e-mail: moha_attalla@yahoo.com

H. E. Fawaz

Department of Mechanical Engineering,
National Research Centre,
33 El Buhouth Street, Dokki,
Cairo 12311, Egypt
e-mail: ehf20012001@hotmail.com

M. Khalil

Department of Mechanical Engineering,
Faculty of Engineering,
Sohag University,
Shark District,
Sohag 82514, Egypt
e-mail: mohamed_ramadan@eng.sohag.edu.eg

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 15, 2016; final manuscript received January 12, 2017; published online July 6, 2017. Assoc. Editor: Qingang Xiong.

J. Thermal Sci. Eng. Appl 10(1), 011005 (Jul 06, 2017) (10 pages) Paper No: TSEA-16-1266; doi: 10.1115/1.4036788 History: Received September 15, 2016; Revised January 12, 2017

Numerical study of the effect of jet position (JP) on cooling process of an array of heated obstacles simulating electronic components has been investigated based on realizable k–ε model. Jet positions have been changed to impinge each row of obstacles consecutively. The experiments have been achieved at three different values of jet-to-channel Reynolds number ratio, Rej/Rec = 1, 2, and 4. In this study, a comparison between two different cooling processes, cross flow only (CF) and jet impingement with cross flow (JICF), has been achieved. The flow structure, heat transfer characteristics, and the pumping power have been investigated for different jet positions. The results show that the jet position affects significantly the flow structure, as well as the heat transfer characteristics. According to the results of average heat transfer coefficient and the pumping power, the more effective jet position for all values of jet-to-channel Reynolds number ratio (1, 2, and 4) is achieved when the jets impinge the third row of obstacles (JP3).

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Figures

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Fig. 1

Sketch of flow structure around an obstacle subjected to: (a) CF and (b) JICF

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Fig. 2

Configuration of the wall-mounted array of heated obstacles subjected to JICF (a) schematic diagram and (b) geometrical description

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Fig. 3

Three-dimensional computational mesh around an obstacle subjected to JICF

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Fig. 4

Experimental values of local heat transfer coefficient on front face of obstacle cooled by CF [1] and numerical values of the present model for different grid sizes

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Fig. 5

Flow structure around a single column of cubical obstacles presented experimentally by Meinders et al. [1] ((a) and (b)) and numerically by the present study ((c) and (d))

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Fig. 6

Velocity streamlines around: (a) two obstacles subjected to CF and its details; (b) LHV and (c) TV and around (d) obstacle subjected to JICF and the next one and its details; (e) UHV and (f) WV

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Fig. 7

Flow structure at different jet positions and Rej/Rec = 1: (a) velocity vectors combined with velocity contours on x–z plane and velocity contours on x–y plane for (b) CF and (c) JICF

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Fig. 8

Flow structure around an impinged obstacle and around a single line of obstacles at JP3 for Rej/Rec equals to: (a) 1, (b) 2, and (c) 4

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Fig. 9

Average heat transfer coefficient on: (a) front, (b) side, (c) top, and (d) rear faces of each obstacle for CF and JICF at JP1, JP3, and JP5 with Rej/Rec = 1

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Fig. 10

Average heat transfer coefficient on: (a) front, (b) side, (c) top, and (d) rear faces of each row of obstacles for CF and JICF at JP3 for different values of Rej/Rec

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Fig. 11

Average heat transfer coefficient on: (a) front, (b) side, (c) top, and (d) rear faces of all obstacles of array for CF and JICF at all jet positions for different values of Rej/Rec

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Fig. 12

Total heat removal rates of the whole array of obstacles for CF and JICF at all jet positions for different values of Rej/Rec

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Fig. 13

Static pressure contours around a single line of obstacles on x–y plane at Rej/Rec = 1 for: (a) CF, (b) JP1, (c) JP3, and (d) JP5

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Fig. 14

Pumping power ratio at all jet positions for different values of Rej/Rec

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