Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 24: Pattern formation in colloidal and granular systems I

DY 24.8: Vortrag

Donnerstag, 26. März 2009, 16:30–16:45, ZEU 255

Air pressure influence on the sublimation of a granular gas in an annular conveyor — •Ralph Neubauer¹, Ingo Rehberg¹, and Christof Krülle² — ¹Universität Bayreuth - Experimentalphysik V, D-95440 Bayreuth — ²Hochschule Karlsruhe - Technik und Wirtschaft, D-72133 Karlsruhe

Glass beads in a sinusoidally driven annular conveyor show the effect of solid to fluid transition. For a small range of driving frequencies the width of the gas phase is accompanied by a hysteresis. We observe this hysteresis, which is also affected by air pressure, with different amounts and sizes of the grains in the diameter range of 0.3 mm to 1.2 mm. In addition, the influence of the electrostatic charging is investigated by changing the grains from glass beads to conductive silver-coated glass beads.