Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.96: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Rotating granular flow: variing the Froude number by variing g — •A. Brucks1, H. Oelze1, S. Odenbach1, and R. Lueptow2 — 1Zentrum f. angew. Raumfahrttechnologie u. Mikrogravitation, Universität Bremen, Am Fallturm, 28357 Bremen — 2Dept. of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Rm. B223 Evanston, IL 60208-3111, USA
The effect of hyper gravity on granular flow in rotating tumblers is presented. For the flow in granular materials under motion in a rotating quasi 2D tumbler four characteristic flow types are known: avalanching, cascading, cataracting and centrifuging system. The Froude number, relating centrifugal forces and gravity in the system, is often used as a dimensionless parameter charaterizing the different flow regimes. Up to now experiments have been performed variing the Froude number by geometry and angular velocity.
In this study the focus lies on the variation of g and thus finding more hints whether the Froude number is the best dimensionless parameter to describe this problem.