N2 - The aim of this paper is to investigate the effect of thermal stratification together with variable viscosity on free convection flow of non- Newtonian fluids along a nonisothermal semi infinite vertical plate embedded in a saturated porous medium. The governing equations of continuity, momentum and energy are transformed into nonlinear ordinary differential equations using similarity transformations and then solved by using the Runge-Kutta-Gill method along with shooting technique. Governing parameters for the problem under study are the variable viscosity, thermal stratification parameter, non-Newtonian parameter and the power-law index parameter.The velocity and temperature distributions are presented and discussed. The Nusselt number is also derived and discussed numerically. L1 - http://journals.pan.pl/Content/94380/PDF/06_paper.pdf L2 - http://journals.pan.pl/Content/94380 PY - 2012 IS - No 4 December EP - 121 DO - 10.2478/v10173-012-0030-z KW - Free convection KW - Thermal stratification KW - Non-Newtonian KW - Variable viscosity KW - Porous medium A1 - Moorthy, M.B.K. A1 - Senthilvadivu, K. PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2012 T1 - Effect of variable viscosity on free flow of non-Newtonian power-law fluids along a vertical surface with thermal stratification SP - 109 UR - http://journals.pan.pl/dlibra/publication/edition/94380 T2 - Archives of Thermodynamics