So I’m using the shan-chen multiphase model to simulate coalescence of bubbles and now I want to estimate the surface tension.

First thing is the pressure doesn’t vary as expected, it does

http://i40.tinypic.com/t7bxg2.jpg

if the pressure is plotted against x through the center y coordinate

for a bubble like

http://i43.tinypic.com/2ywtnk8.jpg

I thought the maximum pressure would be in the center of the bubble as I’ve seen described in some pubs…

In any case if this is correct then that’s fine.

Using this I can plot the pressure against the inverse radius and I get a linear relationship as according to laplace’s law. Now my question is what are the units of this. I am using the introduction to geoscientists and engineers book but can’t figure out what ts^-2 and lu are and how I convert them to SI.

Any help would be appreciated!