Navier Stokes Equation for Non-newtonian fluid?
What should be the modification in General Navier Stokes Eqaution to account for the Non newtonian fluids?
Can somebody please explain? |
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you have to consider a non-linear relation between stress and velocity gradient |
Thanks for the reply FMDenaro..
yes it is understood that for non-newtonian fluid, the shear stress of fluid is not in linear relation with velocity gradient.. the momentum equations contains the viscosity.. how the equations will be modified ? or do we need to modify it at all? |
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You need to acquire a model for the viscosity. The most simple to use is the "power law model" which is time independent. There are other models for mixtures (less than 5% concentration by volume), which simply apply a coefficient to the viscosity. There are also discontinuous models where if u<x, eta = infinity, if u>x eta = a small number, etc. It is up to you to do the research, but you might get better answers looking in a rheology book.
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Thanks H0T_S0UP!
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