1. Dept. of Chemical Engineering; Hamedan University of Technology; P.O. Box, 65155 Hamedan Iran
2. Dept. of Chemical Engineering; University of the Basque Country; P.O. Box, 644, 48080 Bilbao Spain
3. Dept. of Mechanical and Aeronautical Engineering; Clarkson University; Potsdam, NY 13699