[Heat Pipe]

Hi every one has experience about the following case reply because my progress stopped at this point and I couldn't find any tutorial or even manual notes

So I hope to solve this issue as soon as possible :

- heat pipe three sections : evaporator, adiabatic and condenser section
- two phases ( vapor + water ) no mixture between them , each fluid within separable region but there is evaporation at evaporator and condensation at condenser , also two radial velocities ,,,

- How to write UDFs for heat+mass transfer ?
- How to write UDF for heat flux ?