Analytical Investigation of Pulsating Flow around Heating Components in Rectangular Duct Enhancement of Water Cooling Performance in Narrow Flow Passages by Using Micro Heat Sinks With Miniature Vortex Generators

In recent years, since heat dissipation rates and high frequency electronic devices have been increasing, a heat sink with high heat transfer performance is required to cool these devices. Heat sink utilizing micro-channels with several ten microns are expected to provide an excellent cooling performance because of their high heat transfer capacities due to small channel. Therefore, various porous materials such as cellular metals have been investigated for heat sink applications. However, heat sink using conventional porous materials has a high pressure drop because the cooling fluid flow through the pores is complex. Among the described porous materials, a lotus-type porous metal with straight pores is preferable for heat sinks due to the small pressured drop. In present work, cooling performance of the lotus copper heat sink for air cooling and water cooling is introduced. The experimental data for air cooling show 13.2 times higher than that for the conventional groove fins. And, the data for the water cooling show 1.7 times higher than that for the micro-channels. It is concluded that lotus copper heat sink is the most prospective candidate for high power electronics devices.

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Enhancement of Water Cooling Performance in Narrow Flow Passages by Using Micro Heat Sinks With Miniature Vortex Generators

Volume 1: Thermal Management ◽

10.1115/ipack2015-48607 ◽

2015 ◽

Cited By ~ 1

Author(s):

Kazuma Obata ◽

Takashi Fukue ◽

Koichi Hirose ◽

Mamoru Kikuchi ◽

Yasuhiko Ueda ◽

...

Keyword(s):

Electric Vehicles ◽

Heat Sink ◽

Heat Dissipation ◽

Vortex Generator ◽

Heat Sinks ◽

Vortex Generators ◽

Water Cooling ◽

Power Devices ◽

Cooling Device ◽

Flow Passage

This study describes a possibility of an improvement of water cooling devices for high-power electronic devices such as inverters for electric vehicles by using a combination of micro heat sinks and miniature vortex generators. Power devices such as IGBT (Insulated Gate Bipolar Transistor) are widely used for controlling an operation of electronic vehicles and hybrid vehicles. Due to the improvement of the performance of the power devices, the heat dissipation density from these devices becomes higher. The water cooling is the commonest method for dissipating heat from the inverter of the electronic vehicles. Therefore the improvement of the water cooling technology is significantly needed in order to manage the increase of the heat dissipation density. We are now trying to develop a high-performance water cooling device for dissipating the high heat flux from the inverters in the electric vehicles by using a combination of a fine miniature heat sink and a miniature vortex generator. The combination of the miniature heat sink and the vortex generator may increase heat transfer performance of the heat exchanger while inhibiting an increase of pressure drop by generating a swirling turbulent flow in a clearance between the heat sink fins. In this study, the water cooling performance in the narrow flow passage, which simulates the flow passage in the water cooling device, with the miniature heat sink and the miniature vortex generators was investigated by using 3-dimentional CFD analysis. From the analysis, we conclude that the combination of the miniature heat sink and the vortex generator was effective for the heat transfer enhancement in the narrow flow passage of the water cooling device while inhibiting the generation of the pressure drop when we can use the combination with the appropriate manner.

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Analytical Investigation of Pulsating Flow around Heating Components in Rectangular Duct

The Proceedings of the Thermal Engineering Conference ◽

10.1299/jsmeted.2018.0119 ◽

2018 ◽

Vol 2018 (0) ◽

pp. 0119

Author(s):

Takashi Fukue ◽

Hidemi Shirakawa

Keyword(s):

Analytical Investigation ◽

Pulsating Flow ◽

Rectangular Duct

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Experimental and Analytical Investigation of Compact Liquid Cooled Heat Sinks

Heat Transfer, Volume 2 ◽

10.1115/imece2004-59331 ◽

2004 ◽

Author(s):

M. Zugic ◽

J. R. Culham ◽

P. Teertstra ◽

Y. Muzychka ◽

K. Horne ◽

...

Keyword(s):

Heat Transfer ◽

Experimental Tests ◽

Reynolds Numbers ◽

High Heat ◽

Analytical Investigation ◽

Boundary Resistance ◽

Heat Fluxes ◽

Heat Sinks ◽

Air Cooling ◽

Design Tools

Compact, liquid cooled heat sinks are used in applications where high heat fluxes and boundary resistance preclude the use of more traditional air cooling techniques. Four different liquid cooled heat sink designs, whose core geometry is formed by overlapped ribbed plates, are examined. The objective of this analysis is to develop models that can be used as design tools for the prediction of overall heat transfer and pressure drop of heat sinks. Models are validated for Reynolds numbers between 300 and 5000 using experimental tests. The agreement between the experiments and the models ranges from 2.35% to 15.3% RMS.

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Overall cooling performance evaluation for film cooling with different winglet pairs vortex generators

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2021.117731 ◽

2021 ◽

pp. 117731

Author(s):

Hefang Deng ◽

Jinfang Teng ◽

Mingmin Zhu ◽

Xiaoqing Qiang ◽

Shaopeng Lu ◽

...

Keyword(s):

Performance Evaluation ◽

Film Cooling ◽

Vortex Generators ◽

Cooling Performance

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CFD-BASED STUDY ON RELATIONSHIP BETWEEN COOLING PERFORMANCE OF PULSATING FLOW AND RIB HEIGHT MOUNTED IN MINI RECTANGULAR CHANNEL

JOURNAL OF TECHNOLOGY & INNOVATION ◽

10.26480/jtin.01.2021.26.29 ◽

2020 ◽

Vol 1 (1) ◽

pp. 26-29

Author(s):

Shintaro Hayakawa ◽

Takashi Fukue ◽

Hidemi Shirakawa ◽

Wakana Hiratsuka

Keyword(s):

Heat Transfer ◽

Heat Transfer Performance ◽

Rectangular Channel ◽

The Body ◽

Pulsating Flow ◽

Cfd Analysis ◽

Human Beings ◽

Pumping Power ◽

Transfer Enhancement ◽

Cooling Performance

This study aims to develop a novel water-cooled device that increases heat transfer performance while inhibiting the increase of pumping power for next-generation electronic equipment. Our previous reports have reported that the combination of the pulsating flow, which is the unsteady flow that the supply flow rate is periodically changed likes a blood in the body of human beings, and the rib has higher cooling efficiency. In this report, in order to optimize the dimensions of the ribs from the viewpoint of the cooling performance, an investigation of the pulsating flow around the rib was conducted through 2D-CFD analysis while changing the height of the rib. It was found that the level of the heat transfer enhancement was dependent on the rib height.

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