Electrohydrodynamic condensation heat transfer modulation under dc and ac applied voltages in a horizontal annular channel

An experimental study of direct (DC) and alternating current (AC) EHD induced condensation heat transfer modulation for a single tube condenser has been conducted. A single-pass, counter-current heat exchanger with a rod electrode placed concentric to the tube was studied. Experiments were conducted for R134a with inlet qualities of 50-90%, heat flux of 11 kW/m2, mass fluxes from 75 kg/m2 s to 400 kg/m2 s and applied voltages from 0 kV to 8 kV …