NUMERICAL ANALYSIS OF THERMOELECTRIC COVECTION IN HORIZONTAL CYLINDRICAL ANNULI WITH WEAK UNIPOLAR INJECTION
The thermoelectric convection in a dielectric liquid confined in horizontal cylindrical annuli is numerically investigated using a two-dimensional unified lattice Boltzmann method. The liquid is subjected to the simultaneous actions of a weak unipolar injection together with a temperature gradient. In this paper we focus on the heat transfer enhancement due to the flow motion induced by the Coulomb force, the results in terms of various non dimensional characteristic parameters (electrical parameter T, Rayleigh number Ra, Prandtl number Pr and mobility parameter M) is given and analyzed. What's more, the cases with different locations of inner cylinder are also studied. It is found that the values of T as well as Pr and M (which depend only on the fluid properties) have great influences on flow motion and heat transfer. However, the Nusselt number do not depend on the Rayleigh number and the location of inner electrode for the considered situations, which means that the motion is completely dominated by the electric forces which are capable to enhance the heat transfer.