modeling heat pipe by lbm

Hi all of you,

I’m starting modeling heat pipe (which is a pipe where there’s a phase change and a circulation of fluid caused by gravity or porous media). So my problem is how to model phase change in heat pipe. I saw the Shan_Chen model but i think that it studie phase change in small scale (by concidering a buble and saying it’s moving by the time). In my case i need to studie the howl heat pipe not only the phase change.

anyone can see this link to understand my problem :

PS: i need a fluid+thermel model

Thank you