Viscosity Term in ChamberSphere possibly wrong

[KatrinKoesler]

Description

In the paper, on which this block is based, there are two different versions of the same viscosity term. I am currently not sure, which of those terms is correct, i.e., whether the term used in the current ChamberSphere model is correct.

Reproduction

Expected behavior

?

Additional context

No response

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[mrp089]

From Caruel et al. the term in question:

[KatrinKoesler]

Closed with #217