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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?

2

Property prediction (-Dict modules) / Re: Imbibition Saturation maximum percentage

« on: February 26, 2024, 12:29:40 PM »

Hi Anne,

Thanks for the answer and apologies for the late response. I found out that unchecking "Replaced Fluid can leave a residual" (the second setting you listed) solved the problem. Thank you!

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Property prediction (-Dict modules) / Imbibition Saturation maximum percentage

« on: February 20, 2024, 10:22:29 AM »

Hi,

Whenever I run an imbibition simulation, the solver stops at around 70% saturation. Ideally, I would want 90-100% saturation to be achieved. What causes the solver to converge at a specific saturation? I can't disclose many details for confidentiality reasons.