1. COPPE, Department of Mechanical Engineering, Universidade Federal do Rio de Janeiro, PO Box 68.503, 21.941.972, Rio de Janeiro, RJ, Brazil,
2. Department of Mechanical Engineering, Universidade de Brasília, 70.910.900, Brasília, DF, Brazil
3. Department of Aerospace Engineering, Texas A&M University, 77843-3409, College Station, Texas, USA