March 29, 2022 at 12:27 amshitizsehgalSubscriber
I am simulating a phase-change problem, i.e. absorption of water vapor into a liquid film of a halide salt solution. I am using a UDF based on Fick's law to define the mass transfer mechanism between the phases. My question is: Does it matter if from phase is gas and to phase is liquid? In reality, that's how I want it to be and that's how the UDF is written.March 29, 2022 at 9:05 amDrAmineAnsys EmployeeMass Transfer to be described from liquid to gas. This holds true especially if you want to use the dedicated multiphase mass transfer UDF's. If you want to use DEFINE_SOURCE kind of UDF's where you need to define everything on your own I do not think that you need to stick to that.
Now why are you stuck there?
March 29, 2022 at 1:23 pmshitizsehgalSubscriberReason being the standard state enthalpy being negative in my case for the vapor. As discussed from the other thread, the standard state enthalpy should be positive. In my case, the phase interaction is defined from gas to liquid as is the nature of the problem. ThatÔÇÖs why I asked this question.
March 29, 2022 at 1:25 pmshitizsehgalSubscriberBtw, by dedicated multiphase mass transfer UDFs you mean the in-built mechanisms such as evaporation-condensation, boiling. etc, right?
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