Ahumada, L. M. .; Bula Silvera, A. J.; Melendez Valencia, K. A.; Medina Suarez, J. Comparison of an Analytical and Computational Fluid-Dynamics Models of a Commercial Ranque-Hilsch Vortex Tube Operating With Air and Methane. CT&F Cienc. Tecnol. Futuro 2019, 9, 61-71.