Thermal Convection in Granular Gases with Dissipative Lateral Walls

Giorgio Pontuale, Andrea Gnoli, Francisco Vega Reyes, and Andrea Puglisi
Phys. Rev. Lett. 117, 098006 – Published 26 August 2016
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Abstract

We consider a granular gas under the action of gravity, fluidized by a vibrating base. We show that a horizontal temperature gradient, here induced by limiting dissipative lateral walls (DLW), leads always to a granular thermal convection (DLW TC) that is essentially different from ordinary bulk-buoyancy-driven convection (BBD TC). In an experiment where BBD TC is inhibited, by reducing gravity with an inclined plane, we always observe a DLW TC cell next to each lateral wall. Such a cell squeezes towards the nearest wall as the gravity and/or the number of grains increase. Molecular dynamics simulations reproduce the experimental results and indicate that at large gravity or number of grains the DLW TC is barely detectable.

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  • Received 21 December 2015

DOI:https://doi.org/10.1103/PhysRevLett.117.098006

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Giorgio Pontuale1, Andrea Gnoli1, Francisco Vega Reyes1,2, and Andrea Puglisi1

  • 1Istituto dei Sistemi Complessi—CNR and Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy
  • 2Departamento de Física and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, 06071 Badajoz, Spain

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Issue

Vol. 117, Iss. 9 — 26 August 2016

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