BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 13: Granular Physics 3 - organized by Matthias Sperl (Köln)
DY 13.1: Vortrag
Montag, 22. März 2021, 15:00–15:20, DYc
Monitoring granular drag with non-invasive particle tracking techniques — •Kai Huang1,2, Jinchen Zhao1, Chen Lyu1, Valentin Dichtl2, and Simeon Voelkel2 — 1Institute of Applied Physical Sciences and Engineering, Division of Natural and Applied Sciences, Duke Kunshan University, No. 8 Duke Avenue, Kunshan, Jiangsu, China 215316 — 2Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany
Considering granular materials as a complex fluid with a finite yield stress, an object moving inside has to locally unjam and mobilize the surrounding particles in order to step forward. Consequently, granular drag depends strongly on the local rheological behavior and it is essential to have an ’insider’ view on granular dynamics. Experimentally, this is achieved using microwave radar and embedded IMU sensor techniques. Our results are in align with discrete element simulations equipped with coarse-graining techniques, which provide additional information on response of the granular bed. Our results of the intruder dynamics are in congruent with existing phenomenological model on granular drag. Interestingly, we find that the macroscopic profiles of the granular bed ahead of the intruder decays exponentially in the co-moving system of the intruder, giving rise to a characteristic length scale on the order of intruder size. Stepping further, we explore the influence of gravity on granular drag by means of microgravity environment in order to shed light on challenges arising from space exploration.