Programme  Titles  Presenters  Topics  Session 8B: Particles and Gas/Fluid Friday, July 17, 2009, Friday, July 17, 2009 10:45 am Metals Hall Chair: Hans Herrmann 8B-1 Towards a Dynamical Collision Model of Highly Porous Dust Aggregates Carsten Güttler*, Maya Krause, Ralf Geretshauser, Roland Speith, Jürgen Blum 8B-2 Role of the boundary conditions at the bed in aeolian sand transport Alexandre Valance*, Rainier Hreiz, Pascal Dupont, Ahmed Ould El Moctar 8B-3 The Role of Turbulence on the Initiation of Sediment Movement Panayiotis Diplas*, Clint Dancey, Manousos Valyrakis, Ozan Celik, Krista Greer 8B-4 Mechanical behavior of "living quicksand": Simulation and Experiment Dirk Kadau*, Jose S. Andrade Jr., Hans J. Herrmann 8B-5 Dependence of Particle Fluctuation Velocity on Gas Flow, and Particle Diameter in Gas Fluidized Beds of Monodispersed Spheres in the Geldart B and A Fluidization Regimes George Cody*, Jayati Johri, David Goldfarb 8B-6 Flow regimes in vertical pneumatic conveying S. B. Kuang, A. B. Yu*, Z. S. Zou 8B-7 Craters Formed in Granular Beds by Impinging Jets of Gas Philip T. Metzger*, Robert C. Latta III, Jason M. Schuler, Christopher D. Immer