Based on the theoretical analysis

the electrohydrodynamics (EHD) enhancement of condensation heat transfer inside vertical tube for five representative electrodes were investigated.The experimental results showed that under the same working condition the bigger the electrode diameter

the bigger the relative reduction rate of the condensation film thickness and the lower the beginning voltage for the thickness reduction of the condensation film.The relative reduction rate of the thickness increased with increasing voltage.Furthermore

the high value of the relative reduction rate of the condensation film thickness did not certainly accompany the high value of the enhancement factor.