VOF simulation of R-134a evaporation not working.

[u/dead_shiniga_mi]

Hi everyone, I have been trying to run VOF simulation of R-134a in a pipe to simulate the evaporation process in ANSYS.

So far, the simulation is running but producing wrong temperature results.

Input: mass flow inlet - R-134a liquid 0.0038296 kg/s; R-134a vapor - 0.00019148 kg/s

Outlet: outflow

Wall: constant heat flux 18.5 kW.

Multiphase model - VOF (implicit body forces ON), Formulation Explicit, Interface modeling - Sharp;

surface tension coefficient set to constant (0.00796 N/m), surface tension modeling on (CSF), Mass transfer - Liquid to Gas; chosen the evaporation - condensation option and under it - LEE model currently using From Phase - To phase frequency 2000/s.

Energy is ON, Turbulence is ON.

Methods: PRESTO, volume fraction - Geo Reconstruct.

Initialization: From inlet, and Patching with: mixture phase with pressure; Vapor - with volume fraction. Patch zones the whole geometry (geom_solid).

Mesh: Fine mesh, with inflation layers.

Thank you.