You are expecting a temperature difference of 97 degrees and a pressure drop less than 0.5 bar? Unless have something going on that is much more efficient than a traditional vortex tube, that does not sound reasonable.

EDIT: If the Prof., who is 2019 received a $20k project to study vortex tubes, had used that money for ANSYS training or to support a good post-doc who could model this in a couple of months, maybe he wouldn't be on here asking for help from volunteers. Unfortunately, given the circumstances, I will step away from a project that I found interesting at the beginning.