capillary files

Hello,

"r" stands for the radii ratio (greater radius divided by smaller radius) between two capillary bonded spheres.
The very first lines of each file include
- the r value
- the number Nd of dimensionless interparticle distances in this file
- a number Nuc of dimensionless capillary pressure values

Then, you have Nuc lines describing Nuc capillary bridge configurations in terms of 6 columns with :
- the dimensionless distance value (constant along these Nuc lines)
- a dimensionless capillary pressure value
- a dimensionless liquid volume volume
- a dimensionless force value
- a filling angle on the smallest particle (in degrees)
- a filling angle on the biggest particle (in degrees)

(This scheme repeats Nd times)

If you're interested in these files, I'd recommend you give a look to https://bugs.launchpad.net/yade/+bug/1440887, and especially #4 that gives a MATLAB file to plot the capillary files data.

Hi Jerome,

Thanks for the explanation.

Seungcheol

Hi Jerome,

One more question.

what if the radii ratio is not same as the values given in the files?

The reason why I am asking is that most of my radii ratios are out of the values that were given in the files because I have a various size of sphere packing based on the grain size distribution.

So, if one of my ratio is 1.2 for instance, does this mean that I cannot create meniscus between those spheres?

Thank you for your time.

Seungcheol

No, it's not a problem.

The menisci of Yade simulations with Law2_ScGeom_CapillaryPhys_Capillarity are obtained *interpolating* from these capillary files.

So, there is no problem if your radi ratio is 1.2, your distance is e.g. 0.0213942 (which is not exactly in the data -- just a random example), and your capillary pressure is pi/3 (which is not in the data as well), your meniscus will still be created if there are tabulated data from which interpolation is possible.

In short, menisci configurations for radii ratio = 1.2 will be interpolated from r=1.1 and r=1.25 data.

Thanks for the response.

So, as long as the ratio is in between those files, then it does not matter.
But if my ratio is greater than 10, then the meniscus is no longer available. Am I understanding correctly?
Thanks again.

Seungcheol

Thanks Chris :)

Thanks Jérôme Duriez, that solved my question.