Effects of controller and nonuniform temperature profile on the onset of rayleigh-bénard-marangoni electroconvection in a micropolar fluid

Linear stability analysis is performed to study the effects of nonuniform basic temperature gradients on the onset of rayleigh-bénard-marangoni electroconvection in a dielectric eringen's micropolar fluid by using the galerkin technique. in the case of rayleigh-bénard-marangoni convection,the eigenvalues are obtained for an upper free/adiabatic and lower rigid/isothermal boundaries. the influence of various parameters has been analysed. three nonuniform basic temperature profiles are considered and their comparative influence on onset of convection is discussed. different values of feedback control and electric number are added up to examine whether their presence will enhance or delay the onset of electroconvection. © 2014 h. m. azmi and r. idris.