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Electrostatically-Enhanced boiling of dielectric liquids: Effect of Electrostatic re-wetting
Keywords: Critical Heat Flux, Interfacial Electric Pressure, Electrostatic Wetting and Spreading
Two-phase cooling characteristics of falling jets of dielectric liquids in the presence of a strong electric field was investigated. In the previous works, the electric field-assisted boiling heat transfer enhancement has been speculated and it has not been described in detail. Here, we reveal clear experimental and theoretical evidences to confirm our hypothesis that the interfacial electrostatic pressure may significantly enhance the re-wetting and spreading of the liquid and boiling characteristics. We demonstrated a strong connection between our fundamental understanding of the electrostatic wetting and CHF heat transfer enhancement due to the imposed electric field. Both theoretical and experimental frameworks were constructed for further confirm the heat transfer enhancement mechanisms particularly at critical heat flux regime. It was also found that the boiling curve shows a flat trend in the presence of the electric field and shows gradual decrease at post-CHF regime. This may improve the reliability of the heat removal at CHF regime.
Seyed Reza Mahmoudi, Associate Research Assistant
Massachusetts Institute of Technology (MIT)
Cambridge, MA

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