Capillary Flow in a Tube

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  • Thread starter Niles
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I'm trying to understand capillary flow in a tube. I've found this website that explains some aspects of it, the system is illustrated here,

img215.gif


So the (black) non-wetting fluid resides to the left and the (white) wetting fluid is to the right. Say that we are looking at a pore in a piece of chalk/rock and that the outlet (to the right) is a big reservoir of wetting fluid, whereas the inlet to the left is merely the end of the pore. Given this setup, I can't quite figure out how the inlet pressure pL relates to the outlet pressure pR.

They can't be equal since the capillary forces must introduce a pressure gradient which "pushes" the non-wetting phase out, given that the solid boundary is wetting. Given this, I would anticipate that pR<pL.

Is this reasoning correct?
 
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Thanks for the thread! 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? The more details the better.
 

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