Learning Forum

[Thiago]

Hi. nnI am trying simulate a multiphase system ( pure liquefied propane) in a tank under heating using ANSYS FLUENT 2021R1. The tank doesn?t have flow in and flow out, it is closed. I Set 0.95 liquefied propane using Patch. But, ANSYS show me 2 error messages. I have tryed find the solution by myself but I coudnt.nThe error messages are: 1- latent heat can?t be less than zero. 2- float point exception.n In my set up, I am using: nVOF+Lee, propane (gas SRK equation for density); two phases; phase 1 is gas; sharp; The material properties are the same as ANSYS database.nsuface tension coefficient 0.004; nmass transfer- evaporation/condensation, 1 mechanism, frequency 0.1 (both);nThe sataturation temperature I set a polinomial from a databook;nThe liquid propane I created from propane (ansys data) and set a polinomial dependent of temperature for each properties (density, viscosity, thermal condutivity and specific heat). Those polinomials equations I got from a Chemical engineering databook. The other properties ( reference temperature, standard Enthalpy and mocecular weigth) I used the same as propane ansys database.nWhat am I doing wrong?.I aprecciate any help. Thanks in advance.n

[YasserSelima]

May be the pressure/temperature exceeded the critical value n

[Rob]

As the liquid evaporates where does it go? Ie if the gas density can't vary with pressure and the total volume is fixed what will happen? n

[Thiago]

Rob and Yasser, thank you.nI could run my simulation.nBut I have another question.nCan I set the saturation heat of vaporization dependent of pressure? If yes, how?nThank youn

[Rob]

What does the manual tell you?n