1. University of Nebraska-Lincoln, Department of Chemical Engineering, 207 “O” Othmer Hall, Lincoln, Nebraska 68588, University of Sevilla, Mecánica de Fluidos, Esc. Superior de Ing., Avda. de los Descubridores, s/n, 41092 Sevilla, Spain, and University of Málaga Ing. Mecánica y Mec. de Fluidos, E.T.S. Ing. Industriales, Pza. El Ejido, s/n, 29013 Málaga, Spain