The applicability of the Electrohydrodynamic(EHD) technique for in tube condensation heat transfer enhancement of R- 134a was investigated experimentally. Two coaxial cylindrical electrodes of different diameters tested. The Electrohydrodynamic(EHD) power consumption was less than 0.1 of the condenser capacity. EHD voltage was varied from zero kilovolts to 10 kV and sparkover voltage is obtained at voltage of 12 kV and 16 kV from diameter 12mm and 4mm respectively. A maximum enhancement of 2.2 and 1.8 is obtained at voltage of 10 kV for diameter electrod 12 mm and 4mm respectively.
