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In the present paper, a non-Newtonian third-grade fluid flow is considered in   an annulus partially filled by a porous medium of very small permeability.   An analytical solution by the perturbation series method is obtained for   velocity and temperature fields, assuming Reynolds’s model to account for   the variation of fluid viscosity with temperature. The effects of various   pertinent parameters on the flow field, temperature field and entropy   generation number are obtained and discussed graphically

Entropy analysis for third-grade fluid flow with temperature-dependent viscosity in annulus partially filled with porous medium