were investigated the diffusion of a chemically reactive species in a laminar boundary layer flow. Siegel investigated the transient free convection from a vertical flat plate. Free convective flow past a vertical plate has been studied extensively by Ostrach. This can be seen in our everyday life in the atmospheric flow, which is driven by temperature differences. The phenomenon of free convection arises in the fluid when temperature changes cause density variation leading to buoyancy forces acting on the fluid elements. The convection problem in a porous medium has important applications in geothermal reservoirs and geothermal extractions. The wide range of technological and industrial applications has stimulated considerable amount of interest in the study of heat and mass transfer in convective flows. INTRODUCTION The process of heat and mass transfer is encountered in aeronautics, fluid fuel nuclear reactor, chemical process industries and many engineering applications in which the fluid is a working medium. The effects of various flow parameters on velocity, temperature and concentration profiles as well as the skin-friction, Nusselt number and Shear wood number are discussed qualitatively and discussed graphically. The governing non-linear partial differential equations of the flow, heat and mass transfer are transformed into ordinary differential equations by using similarity transformations and then solved by two term perturbation technique. The high quality of the crystals grown by using this method is confirmed by X - ray di ff raction studies, Raman spectroscopy and electrical resistivity measurements, and proved to be higher than that of commercially available MoS 2 crystals.Īn unsteady MHD free convective flow of a viscous incompressible visco-elastic fluid through a porous medium in the presence of radiation and chemical reaction effects are considered. MoS 2 and MoSe 2 do not undergo any structural transitions under pressure. 5 GPa to identify occurrence of any structural transition. The variation of electrical resistance under pressure was m onitored in a Bridgman anvil setup up to 6. Single crystals of MoS 2 and MoSe 2 were grown by chemical vapour tra nsport method using iodine as a transporting agent and characterized by optical microscopy, E nergy dispersive analysis (EDAX), X - ray powder diffraction (XRD) and Hall mobility at room temperature. These compounds have properties tailored for use as storage electrodes in rechargeable photo electrochemical solar energy storage cells. ![]() Molybdenum/tungsten Dichalcogenides constitute a well - defined family of com - pounds which crystallize in a layer - type structure.
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