I am currently working on a CFD-analysis of some pipes, where I need to use a subsonic solver, which means that I need variable density, which means I need to modify my steam.dat-file to have ammonia-data instead of the default water-steam.
I have more or less figured out how to do it, import to excel from dat-file, change data to ammonia and then export again, (I haven´t exported yet).
But I want to know, that what I am doing is correct.
- which temperature-steps would be sufficient.
- how many values are needed.
- some of the values are divided by numbers like "0.2 25" and "0.4 23", what are their function?