Experimental study on nucleate boiling enhancement and bubble dynamic behavior in saturated pool boiling using a nonuniform dc electric field

Electrohydrodynamic effects on bubble motion in dielectric fluids has found positive application for enhanced boiling heat transfer, for example in refrigerators. However the motion of bubbles in columns of dielectric fluid is also of interest where the presence of bubbles may adversely affect the breakdown performance of the liquid dielectric when employed as an electrical insulation. This is the case for superconducting power apparatus designs where liquid nitrogen is used as both coolant and electrical insulation. A model is presented for the bubble motion in a dielectric fluid under the influence of dielectrophoretic force. A model has been developed by analysis of the forces acting upon a bubble within a non-uniform electric field with rod-plane electrode geometry. This set of differential equations can be solved numerically to determine the bubble trajectory for a specified applied voltage. Model results are compared to experimental data for a range of voltages obtained in a column of liquid nitrogen.

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“…The electric field strength E in the x-direction of the rod in Fig.3. can be determined using [12] ] ln[ ) ) ( (…”

Section: Force Analysis For Bubble Motionmentioning

confidence: 99%

A model for bubble motion in non-uniform electric fields

Lewin

Wang

Swaffield

et al. 2008

2008 IEEE International Conference on Dielectric Liquids

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“…Bubble detachment sizes and growth periods are also affected by the presence of an electric field, though there is not at the moment a clear consensus as to the fundamental mechanisms which in some cases cause them to increase and in others decrease. For surface boiling with a large number of nucleation sites on a natural surface, Kweon and Kim [14] observed smaller detachment sizes. This is also generally the case for isolated bubbles growing in non-uniform electric fields [8,15].…”

Section: Introductionmentioning

confidence: 99%

Electric field effects during nucleate boiling from an artificial nucleation site

Siedel

Cioulachtjian

Robinson

et al. 2011

Experimental Thermal and Fluid Science

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“…The use of DEP forces to enhance boiling and evaporative heat transfer has been studied for some time, including earlier efforts by Ogata and Yabe [11], Seyed-Yagoobi et al [12,13], and Darabi et al [14]. More recently, Kweon and Kim [15] studied the use of a nonuniform electric field to enhance nucleate boiling heat transfer. In their experimental study of saturated pool boiling in the presence of a nonuniform DC electric field, a plate-wire electrode configuration was used with Freon-113 as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Combined Dielectrophoretic and Electrohydrodynamic Conduction Pumping for Enhancement of Liquid Film Flow Boiling

Patel

Seyed-Yagoobi

2017

Journal of Heat Transfer

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This paper extends previous liquid film flow boiling studies by including the effect of an additional electrohydrodynamic (EHD) force, namely, the dielectrophoretic (DEP) force. Rather than using only EHD conduction pumping of the liquid film to electro-wet the heater surface, a localized nonuniform electric field above the heater surface is established to generate a DEP force for improved vapor bubble extraction during the nucleate boiling regime. The effects of liquid film height and applied potential are studied as a function of heater superheat and heat flux. A brief analytical study is also used to estimate the expected DEP force magnitude to explain the results. All of the above studies are also used to quantify the enhancement in heat transfer that can be achieved when heat transport systems are driven or augmented by these two EHD mechanisms. The results show remarkable enhancement of up to 1217% in boiling heat transfer coefficient at a given superheat when both mechanisms are used simultaneously. The experimental data are important for applications in thermal management in terrestrial and space conditions.

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Experimental study on nucleate boiling enhancement and bubble dynamic behavior in saturated pool boiling using a nonuniform dc electric field

Cited by 79 publications

References 13 publications

A model for bubble motion in non-uniform electric fields

A model for bubble motion in non-uniform electric fields

Electric field effects during nucleate boiling from an artificial nucleation site

Combined Dielectrophoretic and Electrohydrodynamic Conduction Pumping for Enhancement of Liquid Film Flow Boiling

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