Boiling heat transfer enhancement by utilizing Electrohydrodynamic (EHD) force in micro sized space

This paper describes results from an experimental and theoretical study of the effect of Electrohydrodynamic (EHD) force on the boiling curve in pool boiling. AE-3000 (Asahi Glass Co., Ltd.), which is a dielectric liquid and has a boiling point of 56 °C, was selected as a working fluid. A boiling surface was electrically grounded, and an electrode was placed above the boiling surface at various heights of 200-400 μm. The slits were made in the electrode, which had several hundred micro meters, so as to remove vapor bubbles from the boiling surface by electrostatic force. In this study, the effect of the electric field and of the electrode heights over the boiling heat transfer was investigated. As a result, the maximum heat flux showed 64 W/cm² by the application of electric field of -5kV/mm, which was three times over pool boiling. The theoretical model exhibits the essential feature of the effect of electric field on the boiling heat transfer and shows good agreement with experimental results.