With the increase of fluid viscosity, mass diffusion of a fluid decreases. Then how the diffusion term in Navier-Stokes equation has a dominant effect at high viscosity? Also how the mass convection affects the convective term of Navier-Stokes equation?
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There is no mass diffusion term in the standard Navier-Stokes equation. – mike stone Mar 25 '23 at 11:53
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@mikestone I suspect OP is questioning the $\nu\nabla^2\mathbf{u}$ term in the NS equations, though if they are considering a multi-component flow, there surely can be mass diffusion. – Kyle Kanos Mar 25 '23 at 17:14