Heat Flux boundary condition for multiphase problem
 

Deart All,

How can I define the wall heat flux boundary condition for mutliphase flows.

For single phase flow we used to define this in "T" file in "0" folder for a particular patch as ( dT/dn = q/kf )

In the similar way if i wants to define for multiphase flow ie as ( dT/dn = q/keff) . where "keff" is a scalar filed and is a function of alpha as keff=alpha*kl +(1-alpha) * kv)

How can I do this? Can anyone suggest a solution for this problem?

Thanks & Regards,
Bibin

hi
i use groovy bc for heat flux in the wall
i hope this code can help you

Thank you.... its working

Aslo can u please tell whether it changes at all timesteps or for the first timestep..?? As alpha1 is a function of time...

Thanks &
Regards
Bibin

yes
it changes

Thank you so muchh...

Can I ask a quick logical question. Can we model boiling with simple Lee model (Below) without modelling the nucleation site etc..

m ̇ = rc* (1 − alphal)*ρv *(T − T sat)/Tsat for condensation T < T sat
m ̇ = re* alphal*ρl *(T sat− T)/Tsat for evaporation T > T sat

could you please share your thoughts.. any informations or doc??

Regards,
Bibin

you can see the phasechangeheatfoam solver in the following link
click here

in this solver lee model is exist