Strictly speaking, however, the effective diffusivity is proportional to the reciprocal of the square of the geometrical tortuosity
2.
Observe how the effective diffusivity multiplying the derivative on the right hand side is greater than the original value of diffusion coefficient, D . The effective diffusivity is often written as:
3.
Observe how the effective diffusivity multiplying the derivative on the right hand side is greater than the original value of diffusion coefficient, D . The effective diffusivity is often written as:
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