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Research Papers: Electronic Cooling

Constructal Placement of Discrete Heat Sources With Different Lengths in Vertical Ducts Under Natural and Mixed Convection

[+] Author and Article Information
Bugra Sarper

Department of Mechanical Engineering,
Gumushane University,
Gumushane 29100, Turkey
e-mail: bugrasarper@gumushane.edu.tr

Mehmet Saglam

Department of Mechanical Engineering,
Karadeniz Technical University,
Trabzon 61080, Turkey
e-mail: mehmetsaglam@ktu.edu.tr

Orhan Aydin

Department of Mechanical Engineering,
Karadeniz Technical University,
Trabzon 61080, Turkey
e-mail: oaydin@ktu.edu.tr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 14, 2018; final manuscript received August 2, 2018; published online September 25, 2018. Assoc. Editor: Sara Rainieri.

J. Heat Transfer 140(12), 121401 (Sep 25, 2018) (13 pages) Paper No: HT-18-1224; doi: 10.1115/1.4041187 History: Received April 14, 2018; Revised August 02, 2018

In this study, convective heat transfer in a discretely heated parallel-plate vertical channel which simulates an IC package is investigated experimentally and numerically. Both natural and mixed convection cases are considered. The primary focus of the study is on determining optimum relative lengths of the heat sources in order to reduce the hot spot temperature and to maximize heat transfer from the sources to air. Various values of the length ratio and the modified Grashof number (for the natural convection case)/the Richardson number (for the mixed convection case) are examined. Conductive and radiative heat transfer is included in the analysis while air is used as the working fluid. Surface temperatures of the heat sources and the channel walls are measured in the experimental study. The numerical studies are performed using a commercial CFD code, ANSYS fluent. The variations of surface temperature, hot spot temperature, Nusselt number, and global conductance of the system are obtained for varying values of the working parameters. From the experimental studies, it is showed that the use of identical heat sources reduces the overall cooling performance both in natural and mixed convection. However, relatively decreasing heat sources lengths provides better cooling performance.

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Figures

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Fig. 1

The test cell and experimental setup

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Fig. 2

Front and rear views of the flush-mounted heat sources

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Fig. 3

The positions of thermocouples

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Fig. 4

The sketch of the computational domain

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Fig. 6

Surface temperatures of the heated and unheated walls obtained experimentally and numerically at Lr=1: (a) natural convection and (b) mixed convection

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Fig. 7

Average surface temperatures of the heat sources obtained experimentally and numerically at Lr=1: (a) natural convection, (b) mixed convection

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Fig. 8

Optimization steps: (a) natural convection and (b) mixed convection

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Fig. 5

Grid structure used in mixed convection

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Fig. 13

The variation of the average surface temperatures of the heat sources with Lr in mixed convection

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Fig. 14

The variation of the average Nusselt number with Lr in mixed convection

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Fig. 15

The variation of the global conductance with Lr in mixed convection

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Fig. 9

Configurations of the heat sources

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Fig. 10

The variation of the average surface temperatures of the heat sources with Lr in natural convection

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Fig. 11

The variation of the average Nusselt number with Lr in natural convection

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Fig. 12

The variation of the global conductance with Lr in natural convection

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