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Research Papers: Jets, Wakes, and Impingment Cooling

Thermal Performance of Miniscale Heat Sink With Jet Impingement and Dimple/Protrusion Structure

[+] Author and Article Information
Zhongyang Shen

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

Qi Jing, Di Zhang

Key Laboratory of Thermo-Fluid
Science and Engineering,
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

Yonghui Xie

School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: yhxie@mail.xjtu.edu.cn

Presented at the 2016 ASME 5th Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6324.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 3, 2016; final manuscript received February 19, 2017; published online March 15, 2017. Assoc. Editor: Robert D. Tzou.

J. Heat Transfer 139(5), 052202 (Mar 15, 2017) (8 pages) Paper No: HT-16-1350; doi: 10.1115/1.4036035 History: Received June 03, 2016; Revised February 19, 2017

Cooling technique in a miniscale heat sink is essential with the development of high-power electronics, such as electronic chip. As heat transfer techniques, jet impingement cooling and convective cooling by roughened surface are commonly adopted. To obtain a good cooling efficiency, the cooling structure within the heat sink should be carefully designed. In the present study, the miniscale heat sink with a feature size of 1–100 mm is setup. Arrangement of the jet impingement and dimple/protrusion surface is designed as heat transfer augmentation approaches. The effect of dimple/protrusion configuration and depth to diameter ratio is discussed. From the result, the heat transfer coefficient h distribution of heat sink surface is demonstrated for each case. The pressure penalty due to the arrangement of roughened structure is evaluated. Also, thermal performance (TP) and performance evaluation plot are adopted as evaluations of cooling performance for each configuration. Comparing all the cases, optimal cooling structure considering the energy-saving performance is obtained for the miniscale heat sink. Referencing the statistics, a new insight has been provided for the design of cooling structure inside the miniscale heat sink.

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References

Figures

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Fig. 1

Coordinate system and details of the computational domain

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Fig. 2

Four configurations of dimple/protrusion in the bottom surface of the channel (D is dimple and P is protrusion): (a) dimple case, (b) protrusion case, (c) dimple–protrusion case, and (d) protrusion–dimple case

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Fig. 3

Mesh of dimple case

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Fig. 4

Heat transfer coefficient contours on the bottom surface at the Re of 1000 and the relative depth is 0.2: (a) flat, (b) dimple, (c) protrusion, (d) dimple–protrusion, and (e) protrusion–dimple

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Fig. 5

Heat transfer coefficient contours on the bottom surface at the Re of 2000 and the relative depth is 0.2: (a) flat, (b) dimple, (c) protrusion, (d) dimple–protrusion, and (e) protrusion–dimple

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Fig. 6

Heat transfer coefficient contours on the bottom surface at the Re of 4000 and the relative depth is 0.2: (a) flat, (b) dimple, (c) protrusion, (d) dimple–protrusion, and (e) protrusion–dimple

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Fig. 7

Surface average h of impinging surface for five configurations at the relative depth of 0.2

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Fig. 8

Friction losses f for five configurations at the relative depth of 0.2

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Fig. 9

Variations of surface average h and friction losses f of the five configurations with the dimple/protrusion relative depth at the Re of 3000: (a) surface average h and (b) friction losses f

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Fig. 10

Sectional streamlines, limiting streamlines, and temperature contours of the five configurations; the relative depth is 0.2: (a) flat, (b) dimple, (c) protrusion, (d) dimple–protrusion, and (e) protrusion–dimple

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Fig. 11

Thermal performance variations with Re at the relative depth of 0.2

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Fig. 12

Thermal performance variations with dimple/protrusion relative depth at the Re of 3000

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