Abstract
The trends reported in the literature on the influence of variable viscosity on free convection in liquid filled rectangular porous slabs differ qualitatively. The differences in these trends have been resolved considering nonlinear variation in viscosity with temperature. Numerical results obtained for a wide range of aspect ratios and Rayleigh numbers show that the average Nusselt number always increases when viscosity is varying linearly. The present investigation also establishes the range of the parameters (that describe the nonlinear variation in viscosity) for which the Nusselt number increases or decreases compared to the constant viscosity assumption results.
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