Heat exchange enhancement of jet impingement cooling with the novel humped-cone heat sink

Cooling technique in mini-scale 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 good cooling efficiency, the cooling structure within the heat sink should be carefully designed. In the present study, mini-scale heat sink with feature size of 1∼10 mm is set up. Arrangement of jet impingement and dimple/protrusion surface are designed as heat transfer augmentation approaches. The effect of dimple/protrusion configuration is discussed. From the result, the Nu distribution of on 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 cases, optimal cooling structure considering the energy saving performance is obtained for the mini-scale heat sink. Referencing the statistics, new insight has been provided for the design of cooling structure inside mini-scale heat sink.

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Thermal Characterization of Multiple Micro-Jet Impingement Cooling Model

ASME 2014 12th International Conference on Nanochannels, Microchannels and Minichannels ◽

10.1115/icnmm2014-21736 ◽

2014 ◽

Author(s):

Afzal Husain ◽

Jun-Hee Kim ◽

Kwang-Yong Kim

Keyword(s):

Laminar Flow ◽

Heat Sink ◽

Jet Impingement ◽

Low Flow ◽

Design Parameters ◽

Computational Domain ◽

Flow Conditions ◽

Excessive Pressure ◽

Impingement Cooling ◽

Laminar Flow Conditions

The present study investigated thermal performance of silicon-based multiple micro-jet impingement cooling heat sink for thermal management of electronics. Three-dimensional numerical analysis was performed for steady incompressible laminar flow and conjugate heat transfer through a finite volume solver. A heat flux of 100 W/cm2 was applied at one side of the silicon substrate, while at the other side jet impingement system was designed. The jet plate was consisted of many jet holes whereas computational domain was simplified by utilizing symmetric boundary conditions along the flow as well as lateral directions. The effect of various design parameters, namely, jet diameter, jet pitch, standoff (distance from jet exit to impingement surface) etc., have been analyzed at jet Reynolds numbers 100, 200 and 300 under laminar flow conditions. In view of the low pumping powers available through micro-pumping systems, low flow rates were applied for the analysis. The cross-flow effects of the spent-flow were investigated for finding out optimum design parameters and flow conditions for the heat sink. The temperature distribution was discussed for various values of jet diameter, standoff and jet-to-jet spacing. While a moderate thermal resistance of the heat sink was obtained under laminar flow conditions, high performance can be achieved for higher flow-rate turbulent flow conditions at the expense of excessive pressure-drop which would be investigated in future studies.

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A study of jet impingement cooling enhancement by concave and convex heat sink shape modifications

E3S Web of Conferences ◽

10.1051/e3sconf/202132300010 ◽

2021 ◽

Vol 323 ◽

pp. 00010

Author(s):

Marcin Froissart ◽

Paweł Ziółkowski ◽

Janusz Badur

Keyword(s):

Nusselt Number ◽

Heat Sink ◽

Cold Water ◽

Interaction Model ◽

Jet Impingement ◽

Shape Modification ◽

Stagnation Region ◽

Cooling Effectiveness ◽

Impingement Cooling ◽

Cooling Enhancement

The rising demand for efficient cooling technologies is a strong driver of extensive research in this area. This trend is particularly strong in turbines and microprocessors technology. Presented study is focused on the jet impingement cooling concept, which is used in various configurations for many years. The potential of the heat sink shape modification is not yet fully explored. Available literature suggests that average Nusselt number can be improved by more than 10% by adding conical shape in the stagnation region. This refers to the axisymmetric case where cold-water jet impinges the surface of heated aluminium. Presented results are based on 2D axisymmetric thermal-FSI (Fluid-Solid Interaction) model, which was validated against the experiment. The objective of the presented analysis is to determine the correlation between cooling effectiveness (Nusselt number) and chosen examples of concave and convex shapes located in the jet stagnation area.

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EFFECT OF THE METALLIC FOAM HEAT SINK SHAPE ON THE MIXED CONVECTION JET IMPINGEMENT COOLING OF A HORIZONTAL SURFACE

Journal of Porous Media ◽

10.1615/jpormedia.v21.i4.10 ◽

2018 ◽

Vol 21 (4) ◽

pp. 295-309 ◽

Cited By ~ 4

Author(s):

Nawaf H. Saeid ◽

Nurul Hasan ◽

Mohamed Hairol Bin Hj Mohd. Ali

Keyword(s):

Mixed Convection ◽

Heat Sink ◽

Jet Impingement ◽

Horizontal Surface ◽

Metallic Foam ◽

Impingement Cooling

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Heat spreading of liquid jet impingement cooling of cold plate heat sink with different fin shapes

Case Studies in Thermal Engineering ◽

10.1016/j.csite.2020.100638 ◽

2020 ◽

Vol 20 ◽

pp. 100638 ◽

Cited By ~ 2

Author(s):

Songkran Wiriyasart ◽

Paisarn Naphon

Keyword(s):

Heat Sink ◽

Jet Impingement ◽

Liquid Jet ◽

Cold Plate ◽

Impingement Cooling ◽

Plate Heat ◽

Heat Spreading

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Selective Laser Melting Heat Sinks under Jet Impingement Cooling for Heat Dissipation of Higher Light Output LED Lighting in a Limited Space

Applied Sciences ◽

10.3390/app10113898 ◽

2020 ◽

Vol 10 (11) ◽

pp. 3898

Author(s):

Yi-Cheng Huang ◽

Huan-Chu Hsu

Keyword(s):

Heat Transfer ◽

Selective Laser Melting ◽

Heat Sink ◽

Heat Dissipation ◽

Light Output ◽

Jet Impingement ◽

Heat Sinks ◽

Laser Melting ◽

Impingement Cooling ◽

Led Lighting

In this study, we aimed to create heat sinks with higher heat dissipation capabilities for a compact light-emitting diode (LED) recessed downlight (CLRDL) under jet impingement cooling. We desired to use the sinks in limited space to maintain lower junction temperature and allow higher LED power. Perforated-finned heat sinks (PTFHSs) and metal-foam-like heat sinks (MFLHSs) fabricated using selective laser melting (SLM) were compared with a traditional finned heat sink (TTFHS). Two cooling fans with higher and lower velocity at Reynolds numbers of 16916 and 6594 were individually installed on each heat sink. Numerical simulations were performed using COMSOL rotating machinery and nonisothermal flow interface with the standard k-ε turbulence flow model. Validations were performed on this apparatus. The SLM heat sinks exhibited higher Nusselt numbers and lower thermal resistance than traditional heat sinks because of a relatively higher heat transfer coefficient and larger heat transfer area. For the proposed SLM heat sinks with larger surface areas, complex flow channels, and ventilation holes under jet impingement cooling, the PTFHS exhibited the highest heat transfer enhancement followed by MFLHS and TTFHS. The results contribute to solving the problems of heat dissipation of higher light output LED lighting.

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

Journal of Heat Transfer ◽

10.1115/1.4036035 ◽

2017 ◽

Vol 139 (5) ◽

Cited By ~ 1

Author(s):

Zhongyang Shen ◽

Qi Jing ◽

Yonghui Xie ◽

Di Zhang

Keyword(s):

Heat Transfer ◽

Thermal Performance ◽

Heat Sink ◽

Jet Impingement ◽

Feature Size ◽

Impingement Cooling ◽

Heat Transfer Augmentation ◽

Roughened Surface ◽

And Performance ◽

The Heat Transfer Coefficient

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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