Learning Forum

[efremsurbakti]

Hello. I was working in Thermostatic Expansion Valve with R404a as working fluid. in my case the working fluid  was in liquid phase at the inlet and it vaporize due to pressure drop in outlet. The working fluid is R404a and i got it from REFROP. I tried the eulerian model but i couldnt select the liquid phase as the primary phase and vapor phase for the secondary phase. Any answer will be appreciated.

[Rob]

Assuming the two fluids are defined you pick which phase they're attached to in the Phases which you've expanded in the image. What do you see if you double click on "phase-1" and "phase-2"?

[efremsurbakti]

Dear rwoolhou

Thankyou for your answer, I import the R404 from NIST Table through command, and its said than we only could define the refrigerant between vapour or liquid. I define the R404a as liquid and when i choose it as Phase 1, I confused what should i choose for Phase 2. As you can see if  I choose R404a as phase 2 from the material, it also define as liquid not vapor.

Best Regard
Efrem

[DrAmine]

You cannot use NIST for both phases.

[efremsurbakti]

Dear Amine
Thankyou for your answer, If you don't mind, can you tell me how should i set up fluent for vaporize R404a due to pressure drop in the outlet. Should I use the multiphase, or fluent will automaticly calculate the vaporize process.

Best Regards

Efrem

[DrAmine]

You need to use evaporation and condensation model. With NIST you require some UDF. If you see one phase nist and other phase to UDF or something else and enable thermal phase change.

[efremsurbakti]

Dear Amine
Thank you for your answer. I shall try your suggestion.