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The study uses an optimization approach representation for the variable viscosity effect on the free convection over a vertical permeable plate in porous media. The surface of the vertical plate is uniform wall temperature (UWT). The surface blowing/suction velocity is also uniform. The viscosity of the fluid varies inversely as a linear function of the temperature. The partial differential equations are transformed into non-similar equations and solved by Keller box method (KBM). Compared with the previously published articles, the results are considered to be very consistent. Numerical results for the the local Nusselt number with the two parameters: 1) blowing/suction parameter ξ, 2) viscosity-variation parameter θr are expressed in tables. Through the Taguchi method to predict the best point of the maxima of the local Nusselt number is 1.1152.

Application of Taguchi Experimental Method in Numerical Simulation of Variable Viscosity Effect on Natural Convection in Porous Media