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Research Papers

Development of Boiling Type Cooling System Using Electrohydrodynamics Effect

[+] Author and Article Information
Ichiro Kano

Graduate School of Science and Engineering
Yamagata University,
4-3-16 Jonan, Yonezawa,
Yamagata 992-8510, Japan
e-mail: kano@yz.yamagata-u.ac.jp

Yuta Higuchi

Kitashiba Electric Co., Ltd,
9 Tennohara, Fukushima,
Fukushima 960-1292, Japan
e-mail: yuta.higuchi@kitashiba.toshiba.co.jp

Tadashi Chika

Graduate School of Science and Engineering,
Yamagata University,
4-3-16 Jonan, Yonezawa,
Yamagata 992-8510, Japan
e-mail: tht53130@st.yamagata-u.ac.jp

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 21, 2012; final manuscript received February 5, 2013; published online July 26, 2013. Guest Editors: G. P. “Bud” Peterson and Zhuomin Zhang.

J. Heat Transfer 135(9), 091301 (Jul 26, 2013) (8 pages) Paper No: HT-12-1235; doi: 10.1115/1.4024390 History: Received May 21, 2012; Revised February 05, 2013

This paper describes results from an experimental study of the effect of an electric field on nucleate boiling and the critical heat flux (CHF) in pool boiling at atmospheric pressure. A dielectric liquid of HFE-7100 (3 M Co.) was used as working fluid. A heating surface was polished with the surface roughness (Ra) of 0.05 μm. A microsized electrode, in which the slits were provided, was designed in order to generate non uniform high electric fields and to produce electrohydrodynamic (EHD) effects with the application of high voltages. The obtained results confirmed the enhancement of CHF since the EHD effects increased the CHF to 47 W/cm2 at the voltage of −1500 V, which was three times as much as CHF for the free convection boiling. From the observations of the behavior of bubbles over the electrode and of the boiling surface condition, the instability between the liquid and the vapor increased the heat flux, the heat transfer coefficient (HTC), and the CHF. The usual traveling wave on the bubble interface induced by the Kelvin-Helmholtz instability was modified by adding the EHD effects. The ratio of critical heat flux increase with and without the electric field was sufficiently predicted by the frequency ratio of liquid–vapor surface at the gap between the boiling surface and the electrode.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

EHD conduction pumping [8,9]

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Fig. 2

Simple electrode device for measuring the electrostatic pressure

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Fig. 3

Electrostatic pressure

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Fig. 4

Conceptual geometries of the boiling enhancement

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Fig. 5

Schematic diagram of experimental facility

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Fig. 6

Electrode geometry (All dimensions are in millimeter)

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Fig. 7

Boiling curve with increasing and decreasing heat flux without electrode

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Fig. 8

Boiling curves with various electrode heights at E = 0 kV/mm

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Fig. 9

HTC with various electrode heights at E = 0 kV/mm

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Fig. 10

Relationship between the heat flux and current as a function of wall superheat at H = 300 μm and E = −5 kV/mm

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Fig. 11

Photographs of vapor bubbles behavior at H = 300 μm. (a) E = 0 kV/mm, wall superheat = 22.9 K, heat flux = 11.7 W/cm2 and HTC = 5133 W/(m2 K). (b) E = −5 kV/mm, wall superheat = 22.9 K, heat flux = 23.9 W/cm2 and HTC = 10411 W/(m2 K).

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Fig. 12

Boiling surface after a set of experiment at H = 300 μm and E = −5 kV/mm

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Fig. 13

Boiling curves with various electrode heights at E = −5 kV/mm

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Fig. 14

HTC with various electrode heights at E = −5 kV/mm

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Fig. 15

Photograph of ITO electrode setup

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Fig. 16

Behavior of bubbles in slits

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Fig. 17

Kelvin-Helmholtz instability configuration for EHD effect

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Fig. 18

Enhancement of CHF by electric field

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