Electric Field Heat Transfer Augmentation During Condensation of Nonconducting Fluids on a Horizontal Surface
Experiments were carried out to determine the heat transfer coefficient during condensation on the underside of a horizontal plate with and without an electric field applied perpendicular to the plate. An expression is presented, correlating the augmentation of the heat transfer coefficient to the most unstable wavelength of the electrohydrodynamical instability of the condensate-vapor interface.
A review of electrohydrodynamic enhancement of heat transfer
The heat transfer duty of heat exchangers can be improved by heat transfer enhancement techniques. In general, these techniques can be divided into two groups: active and passive techniques. The active techniques require external forces, e.g. electric field, acoustic or surface vibration etc. The passive techniques require fluid additives or special surface geometries. Electrohydrodynamic (EHD) techniques have been introduced as one of the types of active heat transfer enhancement techniques. This paper presents a review of research works on electrohydrodynamic heat transfer enhancement. This paper can be used as the first guideline for the researcher in using EHD techniques for heat transfer enhancement.
Heat transfer in emulsions of poor conductors under electric field
Abstract The results of investigation are presented of hydrodynamic and heat-transfer processes in dielectric emulsions with disperse phase of higher conductivity under electric field. The dependence of the heat-transfer coefficient on the field strength, temperature driving force, temperature and concentration of emulsions is shown. The accumulation mechanism of space charge which causes EHD-distribution of the field is analysed. A one-dimensional problem is considered whose solution shows charge distribution in the field of a plane capacitor and reveals the presence of similarity region of heat-transfer processes in case of emulsions with high concentrations. The results on heat transfer under the electric field effect are treated in terms of similarity numbers.