Hi DrAmine,nhere's the EOS of my current liquid mixture, I did change some of the setting since last week. The mixture is a 60:40 mixture of water and ethylenglykol, with a mass diffusion coefficients of 1.87e-05 for ethylenglykol in water.n nHow do I actually check for backflow? I don't notice any backflow graphically. It was based on the assumption fromnTemperature contour, with lower temperature at outletnPathline, the path is incomplete which might due to the backflow pressing against itnMessage during calculation, although the area affected is not that large, around 10% of outlet face. Theres's also times where there's no reverse flow message showing up at all.n