reference about the surface tension
 

HI:

does sombody know a good reference for the surface tensions!

regards

Re: reference about the surface tension
 

R. F. Probstein, Physicochemical Hydrodynamics - An Introduction, Wiley Interscience, 1994

Huh. C., Scriven LE. Hydrodynamic model of steady movement of a solid/liquid/fluid contact line. Journal of Colloid and Interface Science. 1971; 35: 85-101

Dussan V., EB., Davis SH. On the motion of a fluid-fluid interface along a solid surface. Journal of Fluid Mechanics. 1974; 65: 71-95

Re: reference about the surface tension
 

hi:

must we give the contact angle during the numerical simulation?

regards

Re: reference about the surface tension
 

That's the best way to do it. Then you have to decided whether the contact angle is static or dynamic. Static is more stable, but dynamic is more realistic. Depends on your application.

Re: reference about the surface tension
 

Thank you very much is the contact angle a constant?

Re: reference about the surface tension
 

That's what we mean by static and dynamic. A static contact angle is constant, but for a moving contact line it is physically unrealistic, although this might not be significant (depending on application). A dynamic contact angle is where theta varies, which is more realistic, but is MUCH more expensive computationally. Factors that can cause changes in contact angle are local velocity vector, surface shape/energy/cleanliness. Concentration, temperature and electric fields are other factors. Enjoy!

Re: reference about the surface tension
 

What do you exactly mean by computationally expensive? I'm working on pretty much the same stuff and I don't know if the static and dynamic contact angle implementations are very different. As long as you calculate the velocity of the contact line, using a dynamic contact angle model you should be able to evaluate the dynamic contact angle.

Cheers,

Shahriar