Transport phenomena involving the combined influence of thermal and concentration buoyancy are often encountered in many engineering systems and natural environments. Combined heat and mass transfer problems with chemical reactions are important in many processes and received a considerable amount of attention in recent years. Obviously, an understanding of this transport process is desirable in order to effectively control the overall transport characteristics. In this context, we make an attempt to investigate the effect of dissipation, the Soret effect, and radiation on the unsteady double diffusive flow of a viscous and electrically conducting fluid through a porous medium in a vertical channel. Also, investigated the Heat and Mass transfer of a viscous fluid with radiation effect in channels/ducts. We discuss the effect of radiation, thermo-diffusion, dissipation, and heat sources on the convective heat and mass transfer flow of a viscous fluid through a porous medium in a rectangular duct.
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