Targeted heat transfer augmentation in circular tubes using a corona jet

Numerical investigation of electrohydrodynamic effects on the airflow through corrugated channels

“…The three terms on the right-hand side of equation (7) are drift, convection, and diffusion currents, respectively. Ignoring the diffusion and convective terms of the electric current density and substituting equations (4) and (7) into equation (6), the charge conservation equation can be rewritten as 20,21 …”

Numerical investigation of electro hydrodynamics (EHD) enhanced water evaporation using Large Eddy Simulation turbulent model

“…They showed that local heat transfer coefficient decreases with increasing in Reynolds number or increasing in the distance between the wire electrodes and the wall surface. Lakeh and Molki [11] experimentally and numerically investigated the effect of EHD enhancement heat transfer on natural convection in a circular tube. They revealed that increasing of applied voltage causes significant augmentation of the heat transfer enhancement up to 8.7 times in comparison with the cases without electric field.…”

Fundamental Evaluation of Thermal Switch Based on Ionic Wind

“…It is worth mentioning that heat transfer enhancement by using ionic wind devices has been studied for decades [10][11][12][13][14][15][16][17][18][19]. For example, [18] showed that ionic wind induced by a wire-type discharge electrode enhanced the heat transfer between two of the surfaces that face each other of a rectangular duct (the duct had a primary airstream).…”

“…For example, [18] showed that ionic wind induced by a wire-type discharge electrode enhanced the heat transfer between two of the surfaces that face each other of a rectangular duct (the duct had a primary airstream). Reference [19] showed numerical simulation results that represent the heat transferred by the ionic wind induced by a wire-type corona electrode from heat sources attached on the outer surface of a circular duct to the air inside the duct. However, as for now, those studies have been simply aimed at the enhancement of cooling objects and lack either of the following two requirements as the thermal switch base on ionic wind: (1) the device has both heat emitter and heat receptor surfaces, and (2) heat flow should be as small as possible when corona wind is off (i.e., it has no primary airstream).…”