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Unusual condition between two fluids
Posted Apr 9, 2013, 10:05 a.m. EDT Fluid & Heat, Heat Transfer & Phase Change 2 Replies
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Hello, i`m new here, then sorry if this is a silly question...
I need to set the follow condition in the interface between two fluids:
ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) - lambda_eff*(dTl/dx)
Where:
ro = density
u = velocity
lambda = condutivity
hfg = latent heat
That is a balance of heat flux.
I must find an boundary condition that lets me set the velocities in the interface, for the two fluids, following that condition.
Someone have any idea, please??
I need to set the follow condition in the interface between two fluids:
ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) - lambda_eff*(dTl/dx)
Where:
ro = density
u = velocity
lambda = condutivity
hfg = latent heat
That is a balance of heat flux.
I must find an boundary condition that lets me set the velocities in the interface, for the two fluids, following that condition.
Someone have any idea, please??
2 Replies Last Post Apr 11, 2013, 6:21 p.m. EDT
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Posted:
1 decade ago
I wouldn't say that is very unusual. I guess you are doing phase change/melting...
Check this model, it does exactly what you want to do:
www.comsol.com/showroom/gallery/6234/
even if in this case it is melting and involves one solid and one fluid:
Niklas
Check this model, it does exactly what you want to do:
www.comsol.com/showroom/gallery/6234/
even if in this case it is melting and involves one solid and one fluid:
Niklas
Hello, i`m new here, then sorry if this is a silly question...
I need to set the follow condition in the interface between two fluids:
ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) - lambda_eff*(dTl/dx)
Where:
ro = density
u = velocity
lambda = condutivity
hfg = latent heat
That is a balance of heat flux.
I must find an boundary condition that lets me set the velocities in the interface, for the two fluids, following that condition.
Someone have any idea, please??
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
I wouldn't say that is very unusual. I guess you are doing phase change/melting...
Check this model, it does exactly what you want to do:
www.comsol.com/showroom/gallery/6234/
even if in this case it is melting and involves one solid and one fluid:
Niklas
Thanks Niklas, that helped me a little, but i still have one problem...
My interface condition is between two fuids, then there will need to be a velocity definition in both domains. Its a discontinuity, thats physically not happens, but is a mathematical aproximation to an boiling effect.
I don't know if I'm clear enough, but i'm trying to simulate an boiling effect, but simplified. I'm not using phase change or moving boundaries.
If I could define different velocities for the domains in the different sides of my boundary, my problem would be solved, but i cant find a module that do this... ^^