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۱Heat transfer of non–Darcy MHD flow of a nanofluid over a stretching\shrinking surface in a thermally stratified medium with second order slip model
نویسنده(ها): ،
اطلاعات انتشار: Scientia Iranica، بيست و دوم،شماره۶، ۲۰۱۵، سال
تعداد صفحات: ۸
The present investigation is mainly focused on the problem of heat transfer of an incompressible heat generating\ absorbing magneto hydrodynamic non–Darcy flow of a water based nanofluid with different metallic and non– metallic nanoparticles over a stretching\shrinking sheet embedded in a thermally stratified porous medium in the presence of thermal radiation with second order slip flow model. To analyze the problem elaborately, numerical simulations are carried out. Moreover, an analytical treatment is performed for a special case. The results for nanofluid velocity, temperature, skin friction coefficient and reduced Nusselt number are discussed. It is found that a unique solution exists in stretching sheet and dual solutions for shrinking sheet which are classified as upper and lower branch solutions. The lower branch solution does not exist when the magnetic field and porous medium are high for a special case. Some of the notable results of nanoparticle volume fraction, non–Darcy, slip and stratification parameters are brought out which may applicable for future research works. To validate the present code the present results are compared with benchmark solutions and observed an excellent agreement.

۲Second law analysis for radiative MHD slip flow of a nanofluid over a stretching sheet with non–uniform heat source e ffect
اطلاعات انتشار: Scientia Iranica، بيست و سوم،شماره۳، ۲۰۱۶، سال
تعداد صفحات: ۱۵
The application of second law of thermodynamics to an electrically conducting incompressible nanofluid slip flow over a stretching sheet is investigated in the presence of thermal radiation and non–uniform heat source\sink, both analytically and numerically. The governing dimensionless equations for this investigation are solved analytically by hypergeometric function and numerically by using Runge–Kutta–Gill method with shooting technique. The e ects of magnetic parameter, nanosolid volume fraction parameter, slip parameter, and suction parameter on velocity pro le are discussed for Ag nanoparticles. Further, in addition to these parameters, the e ects of radiation parameter and non–uniform heat source\sink parameters on temperature pro le and entropy generation number are also discussed. Finally, the results of these pro les of Ag nanoparticles are compared with those of the Cu, Al2O3, and TiO2 nanoparticles. It is inferred that the e ect of slip and non–uniform heat source parameters decrease the entropy generation. The metallic nanoparticles create more entropy than the non–metallic nanoparticles.
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