New Insight into Pseudo-Thermal Convection in Vibrofluidised Granular Systems

Scientific Reports
C R K Windows-YuleD J Parker

Abstract

Utilising a combination of experimental results obtained via positron emission particle tracking (PEPT) and numerical simulations, we study the influence of a system's geometric and elastic properties on the convective behaviours of a dilute, vibrofluidised granular assembly. Through the use of a novel, 'modular' system geometry, we demonstrate the existence of several previously undocumented convection-inducing mechanisms and compare their relative strengths across a broad, multi-dimensional parameter space, providing criteria through which the dominant mechanism within a given system - and hence its expected dynamics - may be predicted. We demonstrate a range of manners through which the manipulation of a system's geometry, material properties and imposed motion may be exploited in order to induce, suppress, strengthen, weaken or even invert granular convection. The sum of our results demonstrates that boundary-layer effects due to wall (in)elasticity or directional impulses due to 'rough' boundaries exert only a secondary influence on the system's behaviour. Rather, the direction and strength of convective motion is predominantly determined by the energy flux in the vicinity of the system's lateral boundaries, demonstrating ...Continue Reading

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Citations

Apr 2, 2020·Annual Review of Chemical and Biomolecular Engineering·C R K Windows-YuleD J Parker
Aug 17, 2020·Physical Review. E·A Rodríguez-RivasF Vega Reyes
Nov 23, 2021·Soft Matter·Hui CaiGuoqing Miao

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Methods Mentioned

BETA
imaging technique

Software Mentioned

PEPT
MercuryDPM

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