Numerical Investigation of Electro-convection Induced by Unipolar Injection in a Finned Cavity
A two-dimensional physical model in a cavity with different fins is designed for char-acteristics of electro-convection.The coupling of the navier-stokes equations,the poisson equation for the electric potential,and the charge conservation equation are solved in the OpenFOAM FVM framework.The results show that the surface of the fin becomes the main area of charge injection due to the large electric field intensity,and finally forms the electric plume at the central axis and symmetrical charge void region at two sides of the cavity.Two symmetrical vortexes in main region and small vortexes in four corners are observed.The intensity of electro-convection increases with the electric Rayleigh number T.When T exceeds a specific threshold Tc,the electro-convection pattern changes to an unstable state.The rectangular finned cavity behaves best in terms of strengthening convection and stabilizing flow pattern,whose electro-convection intensity is 12.8％higher than that of the triangular finned cavity.
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