**Microgravité et Gaz granulaire dissipatif dans un système vibré : un gaz à vitesse
dissymétrique mais à moyenne nulle**

P. Evesque: Lab MSSM, UMR 8579 CNRS, Ecole Centrale Paris, 92295 Châtenay-Malabry, France , pierre.evesque@ecp.fr

**Abstract: **The main topic of this paper (part 4) is the interpretation of data from
extended simulations published in previous Poudres &
Grains (see P&G 17, #1 to #18) concerning the dynamics of N equal-size spheres in a *3d *rectangular cell excited along *Oz* in *0* gravity.*(N=100, 500, 1000,
1200, 2000, 3000, 4000, 4500)*. Different Oz excitation kinds have been used
(symmetric and non symmetric bi-parabolic, symmetric and non symmetric saw
teeth, thermal wall). No rotation is included, dissipation is introduced via a
restitution coefficient *e= **-**V’ _{n}/V_{n}* , where

**Pacs**** # :
**5.40 ; 45.70 ; 62.20 ; 83.70.Fn

*poudres** & grains ***17**(20) 577-594 -16 (Octobre 2009)