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Property prediction (-Dict modules) / Einstein's formula - Knudsen Diffusion (DiffuDict)
« on: March 13, 2024, 05:36:47 PM »
Hi,
I noted in the GeoDict guide that the Knudsen diffusivity is determined by Einstein's formula, which does not include a term for pore diameter: \[ D=E\frac{(x_t-x_0)(x_t-x_0)^T}{2t} \]
What part of Einstein's formula relates to the pore diameter term (here, d) in the usual formula used?
\[ D_{KA}=\frac{d}{3}\sqrt{\frac{8RT}{\pi M_A}} \]
Is it the displacement of the molecules?
I noted in the GeoDict guide that the Knudsen diffusivity is determined by Einstein's formula, which does not include a term for pore diameter: \[ D=E\frac{(x_t-x_0)(x_t-x_0)^T}{2t} \]
What part of Einstein's formula relates to the pore diameter term (here, d) in the usual formula used?
\[ D_{KA}=\frac{d}{3}\sqrt{\frac{8RT}{\pi M_A}} \]
Is it the displacement of the molecules?