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Concept
The Schmidt number is a dimensionless number that describes the ratio of momentum diffusivity (kinematic viscosity) to mass diffusivity, providing insight into the relative thickness of the velocity and concentration boundary layers in fluid flow. It is crucial in characterizing mass transfer processes in fluid dynamics, particularly in systems where both momentum and mass transfer occur simultaneously.
Concept
The Boussinesq Hypothesis simplifies turbulent flow problems by assuming that the turbulence-induced momentum diffusivity is similar to molecular viscosity but much greater, treating the turbulent eddies as isotropic and simplifying the mathematical modeling of turbulence. This approach allows the use of eddy viscosity to represent the effects of turbulence, making it an essential tool in computational fluid dynamics for predicting turbulent flows in various engineering problems.
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