[yashganatra]

Hi,
I am working on Thermal Energy storage. In the attached figure, inside an enclosure, water (at 310 K) flows in U-tube, the enclosure contains gallium (MP=302.9 K). Thus melting should occur.
1. I want to know how should i go about in setting up the problem. Should i go for heat exchanger model?

2. Which boundary conditions should i give to the exchanger walls? Heat transfer should occur on the walls leading to melting.

Any suggestions are most welcome.
I have attached the geometry.
The walls of the enclosure are adiabatic
Thanks,
Yash