Research Papers: Evaporation, Boiling, and Condensation

Effect of Electric Field Distribution Generated in a Microspace on Pool Boiling Heat Transfer

[+] Author and Article Information
Ichiro Kano

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

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 10, 2013; final manuscript received June 16, 2014; published online July 15, 2014. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 136(10), 101501 (Jul 15, 2014) (9 pages) Paper No: HT-13-1346; doi: 10.1115/1.4027881 History: Received July 10, 2013; Revised June 16, 2014

This study describes the effect of an electric field on nucleate boiling and critical heat flux (CHF) in pool boiling. A dielectric liquid of AE-3000 was used as the working fluid. A heating surface was polished to a surface roughness of 0.05 μm. A microsized electrode, in which slits were provided, was designed to generate a nonuniform electric field and produce electrohydrodynamic (EHD) effects with the application of high dc voltages. The obtained results confirmed CHF enhancement as the EHD effects increased CHF to 86.2 W/cm2 with a voltage of −3000 V, which was four times greater than pool boiling in the absence of the electrode. The usual traveling wave on the bubble interface, induced by the Kelvin–Helmholtz instability, was modified by adding the EHD effects. The traveling wave model exhibits the essential features of the phenomenon and shows good agreement with the experimental data.

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Fig. 1

EHD conduction pumping [14,15]

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Fig. 2

Simple electrode device for measuring electrostatic pressure

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Fig. 3

Electrostatic pressure

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Fig. 4

Conceptual geometries of boiling enhancement. (a) Cross section. (b) Projected figure.

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Fig. 5

Schematic diagram of experimental facility

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Fig. 6

Schematic diagram of heating surface block (dimensions in millimeters)

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Fig. 7

Electrode geometry (dimensions in millimeters)

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Fig. 8

Boiling curve with increasing and decreasing heat flux without electrode

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Fig. 9

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

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Fig. 10

Heat transfer coefficients as a function of wall superheat at E = −5 kV/mm

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Fig. 11

Photograph of bubble behaviors at various ranges at E = –5 kV/mm. (a) Range A–B (ΔT = 11.0 K, q = 4.8 W/cm2), (b) range B–C (ΔT = 29.0 K, q = 29.9 W/cm2), (c) range C–D (ΔT = 36.9 K, q = 64.9 W/cm2), and (d) CHF (ΔT = 55.9 K, q = 86.2 W/cm2).

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Fig. 12

Boiling surface after a set of experiment

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Fig. 13

Photograph of a glass electrode setup [25]

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Fig. 14

Behavior of bubbles from the slits at ΔT = 19.8 K, q = 20.6 W/cm2, H = 400 μm, E = −3 kV/mm [25]. (a) Bubble behavior from the electrode slits. (b) Bubble behavior from an electrode slit.

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Fig. 15

Vapor removal configuration for boiling around electrodes

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Fig. 16

Kelvin–Helmholtz instability configuration for EHD effect

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Fig. 17

Heat flux as a function of wall superheat with various electrode heights at E = –5 kV/mm

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Fig. 18

Enhancement for CHF by electric field at E = –5 kV/mm

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Fig. 19

Heat flux as a function of wall superheat with various electric field at H = 400 μm

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Fig. 20

Enhancement of CHF by electric field at H = 400 μm




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