TY - JOUR ID - 73006 TI - Numerical Study of Pure Electroconvection and Combined Electro-thermo-convection in Horizontal Channels JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Gannoun, R. AU - Hassen, W. AU - Elkhazen, M. I. AU - Borjini, M. N. AD - Unit of Metrology and Energy Systems, Department of Energetic, University of Monastir, Monastir, Tunisia Y1 - 2017 PY - 2017 VL - 30 IS - 8 SP - 1270 EP - 1278 KW - heat transfer KW - Electro KW - Hydro KW - Dynamic KW - thermo KW - convection KW - numerical simulation DO - N2 - Electrohydrodynamic effect on natural convection in horizontal channels is investigated from a numerical point of view. The EHD effect is induced by narrow strip electrodes placed at the bottom wall of the channel. The channel is subjected in a first stage only to the electric forces, and in a second stage to the simultaneous action of a temperature gradient and an electric field. The interactions between electric field, flow field and temperature field are analyzed. It can be concluded that charge density distribution, flow pattern and temperature distribution are substantially affected by the arrangement of the electrodes; in fact four different arrangement were treated. The effect of pure electroconvection on charge density distribution and on flow pattern was studied. A periodic flow corresponding to particular values of electric Rayleigh was observed, then the impact of combined electro-thermo convection on heat transfer was undertaken in a second step and it was noted that the optimum arrangement  of the electrodes provides an increase in heat transfer of up to 13%. The effect of the applied electric forces is also studied in order to highlight the importance of putting compromise between the supplied voltage and arrangement of the electrodes. Finally, a study of optimized configuration of electrodes was achieved. UR - https://www.ije.ir/article_73006.html L1 - https://www.ije.ir/article_73006_efa59658a322b2c9eb454bb1e8b8dbe4.pdf ER -