Abstract:The consideration of nanofluids has been paid a good attention on the free convection; the analysis focusing nanofluids in porous media are limited in literature. Thus, the use of nanofluids in porous media would be very much helpful in heat and mass transfer enhancement. In this paper, the influence of magnetohydrodynamic, thermal radiation, Newtonian heating and chemical reaction on heat and mass transfer over a horizontal linearly stretching sheet embedded in a porous medium filled with a nanofluid is discussed in detail. The solutions of the nonlinear equations governing the velocɨty, temperature and concentration profiles are solved numerically using Runge-Kutta Gill procedure together with shooting method and graphical results for the resulting parameters are displayed and discussed. The influence of the physical parameters on skin-friction coefficient, local Nusselt number and local Sherwood number are shown in a tabulated form.
Keywords: MHD, nanoparticle, Newtonian heating, porous medium, viscous dissipation, Williamson fluid model.
[1] Buongiorno, J., (2006), Convective transport in nanofluids, Journal of heat transfer, Vol. 128, No.3, pp.240-250.
[2] Choi SUS, Zhang, ZG, Yu, W., Lockwood, F.E & Gruike, EA, (2001), Anomalously thermal conductivity enhancement in nano tube suspensions, Applied Physics Letters, Vol.79, No.14, pp.2252-2254.
[3] Choi, S. U. S., (1995) "Enhancing thermal conductivity of fluids with nanoparticles in developments and applications of non-Newtonian flows," ASME, FED-vol. 231/MD- vol. 66, pp. 99-105.
[4] Das M., Mahato, R., Nandkeolyar, R., (2015), Newtonian heating effect on unsteady hydromagnetic Casson fluid flow past a flat plate with heat and mass transfer, Alexandria Engineering Journal, Vol.54, pp.871–879.
[5] Gorla, R.S.R., and Sidawi, I., (1994), Free convection on a vertical stretching surface with suction and blowing, Appl Sci Res, Vol.52, pp.247-257.
[6] Hussanan, A. Khan, I. Shafie, S., (2013), An exact analysis of heat and mass transfer past a vertical plate with Newtonian heating, J. Appl. Math., Article ID: 434571.