Abstract

Electrohydrodynamic enhancement of free convection heat transfer was experimentally investigated. Corona discharge was developed on an isothermal horizontal cylinder by a razor electrode. The electrode was connected to the positive polarity of a high voltage power supply with respect to the cylinder connected to the negative polarity. The razor electrode made of stainless steel located 42.5mm below the axe of the cylinder. The electrode was fixed parallel to the axe of the cylinder throughout the experiments. Local Nusselt number was determined by Mach-Zehnder Interferometer without corona discharge for the following Rayleigh numbers D Ra =1529, 2028, 2451, 3143. Without changing the heating powers for these cases, the corona discharge was developed and local Nusselt numbers were determined. Free convection heat transfer was enhanced with corona discharge in the range of the applied voltage limited to the onset corona to pre-breakdown voltage. Maximum value in average Nusselt number with presence of corona wind is 6.37 comparing with 3.33 in free convection for 1529

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