Title :
Heat transfer enhancement by an electrohydrodynamic plume induced by ion injection from a hyperbolic blade
Author :
Jian Wu ; Traore, Philippe ; Louste, Christophe ; Perez, Alberto T. ; Vazquez, Pedro A.
Author_Institution :
Dept. Fluide-Thermique-Combustion, Inst. PPRIME, Futuroscope-Chasseneuil, France
fDate :
June 29 2014-July 3 2014
Abstract :
The electrohydroyanmic (EHD) plume induced by charge injection from a hyperbolic blade into a dielectric liquid was considered to actively enhance heat transfer. We numerically studied an upward-facing hot plate with constant temperature cooled by an impinging ionic jet that results from a strong and autonomous injection. It is shown that the heat transfer rate expressed with the local and averaged Nusselt numbers are dramatically increased. In addition, we observe that the Nusselt number is independent of the Rayleigh number Ra (2.5×103 ≤ Ra ≤ 1.0×104) for all electric Rayleigh numbers T considered (5.0×102 ≤ T ≤ 2.0×104 ), which reflects the fully dominant role of the electric force.
Keywords :
blades; dielectric liquids; electrohydrodynamics; heat transfer; jets; autonomous injection; averaged Nusselt numbers; charge injection; constant temperature; dielectric liquid; electric Rayleigh numbers; electric force; electrohydrodynamic plume; electrohydroyanmic plume; heat transfer enhancement; heat transfer rate; hyperbolic blade; impinging ionic jet; ion injection; local Nusselt numbers; upward-facing hot plate; Blades; Electromagnetic heating; Heat transfer; Electroconvection; dielectric liquid; heat transfer enhancement; ion injection; numerical analysis;
Conference_Titel :
Dielectric Liquids (ICDL), 2014 IEEE 18th International Conference on
Conference_Location :
Bled
DOI :
10.1109/ICDL.2014.6893163
