unit of variables in binary diffusion coefficients equation -- CFD Online Discussion Forums

June 6, 2020, 11:20	unit of variables in binary diffusion coefficients equation	#1
Weiqiang Liu Senior Member Weiqiang Liu Join Date: Feb 2018 Posts: 278 Rep Power: 9	Hi all, I am trying to calculate binary diffusion coefficients in the UDF. I checked ANSYS theory manual and found the equation above. However, I have some confusion about the unit of pressure and molecular weight. For the pressure, I think the unit is pa. While for the unit of molecular weight, I know the default unit of molecular weight in fluent is kg/kmol. I am wondering what is the unit of molecular weight in this equation kg/mol or kg/kmol? Best regards Weiqiang

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