Viscosity -- capillary radius, and permeability threshold

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In a demonstration of the qualities of liquid Helium in type 1, and type 2 the fact that a super-fluid can permeate through capillaries which are too small for type 1 Helium to pass through.

I was wondering about the equation which determines the capillary radius threshold under which the porous barrier is no longer permeable. Doesn't it also depend on the surface tension?
 

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Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
 

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