Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 31: Poster - Pattern Formation

DY 31.2: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster C

Patterns in a Flat Rotating Box — •Adrian Ebert¹, Anna Treffurth¹, and Thomas Grillenbeck^1,2 — ¹Ignaz-Günther Gymnasium Rosenheim, Germany — ²Rosenheim University of Applied Sciences, Germany

If two granulates of different size and texture are filled into a flat container rotating along its horizontal axis, patterns form inside. At lower fill levels, vertical stripes develop; at higher ones, convection occurs reminiscent of rolls in the granular structure. This is astonishing, because, depending on the fill level, nearly no movement is possible and the rolls' rotating sense cannot be caused by the cell rotation. It has to be pointed out that the box must rotate over a long period, ca.10 hours at approximately 20 rotations per minute, in order to get the best results. We examine the various mechanisms which lead to the development of so-called "convection rolls", enabling us to clarify ample connections on the one hand and, on the other, generating completely new observations partially complying with the results of the research at Magdeburg University, but sometimes also raising new questions.