There is no workable theory for vortex tube design. It's still an unsolved problem in that sense. The 50K temperature difference mentioned by Hilsch (below) and Herrada et al. (below) may be a limit. The following references might be of some help:
Singh, P. K., Tathgir, R. G., Gangacharyulu...
Can anyone tell me how to get my Excel VBA code to call a Visual C++ DLL to do something simple like add 2 + 2 ? My Excel VBA code is taking too long to execute, so I've translated the labor intensive part into C. I just don't know how to write a DLL...
