Double Diffusive Mixed Convection in a Channel with a Circular Heater

AbstractDouble diffusive mixed convection in an open channel with a circular heater on the bottom wall has been investigated in this paper. Constant temperatures and concentrations are considered along the semi-circle and the lateral walls of the channel are adiabatic. Galerkin weighted residual finite element method have been used to solve the governing equations. Calculations were performed for Rayleigh numbers and Lewis number. Reynolds and Prandtl numbers are fixed as 100 and 0.7 for whole study, respectively. Various characteristics such as streamlines, isotherms, isoconcentration and heat and mass transfer rate in terms of the average Nusselt number and Sherwood numbers are presented for the aforesaid parameters. It is found that, average Nusselt number at the heat source decreases and overall mass transfer rate in terms of average Sherwood number increases with the rising of Lewis number. In addition, Rayleigh numbers have also significant effects on the heat and mass transfer process

Effects of Joule Heating on Magnetic Field Inside a Channel Along with a Cavity

AbstractA computational solution has been made to obtain flow and temperature field inside a channel with a cavity under magnetic field and joule effect. The left side of the cavity is shorter than right side. Mixed convection heat transfer is studied. Finite element method is used to solve governing equations of laminar flow. The study investigates the effects of three parameters such as Hartmann number, joule parameter and Prandtl numbers for pure mixed convection (Ri = 1). For the specified conditions streamline contours and isotherm contours are obtained and later on the variation of overall Nusselt number and exit temperature are obtained for the aforementioned parameters. It is found that the aforesaid parameters are extremely effective parameter on flow field and temperature distribution. It is also found that both Hartmann number and joule parameter play important role to control the mode of heat transfer