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DY: Fachverband Dynamik und Statistische Physik
DY 13: Granular Physics 3 - organized by Matthias Sperl (Köln)
DY 13.3: Talk
Monday, March 22, 2021, 15:40–16:00, DYc
Aeolian structure formation in a laboratory wind tunnel — •Merve Seckin1, Philip Born1, and Matthias Sperl1,2 — 1Institut für Materialphysik im Weltraum, DLR Köln — 2Institut für Theoretische Physik, Uni Köln
Aeolian transport causes structure formation in beds of granular particles. The length scale of structures formed by aeolian transport is fundamentally connected to the saturation length of the particle flux. Achieving structures on length scales suitable for laboratory experiments by minimizing this saturation length is challenging, but would allow testing and calibrating models of aeolian transport.
Here we show results obtained with very fine particles with an additional surface treatment to minimize cohesion. Saturation lengths of a centimeter can be obtained with this particle system. Consequently, we can show that self-initiated and sustained structure formation from particle beds by aeolian transport is possible at ambient conditions in a benchtop wind tunnel. Barchan-like structures emerge from flat particle beds and from particles heaps, which migrate downwind even without particle influx. We compare the experimental results with the existing theory and discuss open questions.