[1] Univ Toulouse, Inst Mecan Fluides Toulouse, UPS, INPT,CNRS, Toulouse, France
[2] Ctr Natl Etud Spatiales, 18 Ave Edouard Belin, F-31401 Toulouse 9, France
[3] Univ Toulouse, Lab Genie Chim, UPS, CNRS,INPT, Toulouse, France
[4] Univ Toulouse, TBI, INRA, CNRS,INSA, Toulouse, France