Solve Enthalpy or Temperature?

sheng

Hi all,

In order to model pure natural convection flow (heat loss to air) of two completely stratified liquid in a tank, which scalar is better to be solved (enthalpy or temp.)?

These two fluids are of different density, heat capacity and viscosity....

If solving the enthalpy equation, how can I set up the initial condition? In the reality, the two fluid keep the same temperature at the beginning, so this means to set the diffent initial enthalpy values. However, based on this setting, the convective enthalpy is very big during computation, then it will lead to derive a big temperature gradient at the interface of the two layer. Is this correct? Could you give some help on this?

Thanks a lot

Sheng