Ali J. Chamkha

TL;DR: In this article, the effect of double diffusion on mixed convection of a viscous incompressible in an axisymmetric stagnation flow of nanofluid past a vertical cylinder with constant or variable thermal wall condition is analyzed.

TL;DR: In this article, an investigation of unsteady magnetohydrodynamic free convective flow and mass transfer during the motion of a viscous incompressible fluid through a porous medium, bounded by an infinite vertical porous surface, in a rotating system is presented.

Abstract: In this paper, the viscoelsatic boundary layer flow and the heat transfer near a vertical isothermal impermeable surface and in a quiescent fluid are examined. The governing equations are formulated and solved numerically using MackCormak’s technique. The results show excellent agreement with previously published results by a comparision. Representative results for the velocity and temperature profiles, boundary layer thicknesses, Nusselt numbers, and local skin friction coefficients are shown graphically for different values of viscoelsatic parameters. In general, it is found that the velocities increase inside the hydrodynamic boundary layers and the temperatures decrease inside the thermal boundary layers for the viscoelsatic fluid as compared with the Newtonian fluid due to favorable tensile stresses. Consequently, the coefficients of friction and heat transfer enhance for higher viscoelsatic parameters.

TL;DR: In this article, the authors have presented the results of a study conducted at the Indian Institute of Technology (IIT), Kharagpur, India and Aswan University, Aswan, 81528, Egypt.