A thermophilic suspension of nanoparticles heated from below exhibits a complex stability diagram determined by the competition between the stabilizing flux of nanoparticles induced by thermophoresis and the destabilizing flux determined by thermal convection. We investigate Rayleigh-Benard convection in a suspension of highly thermophilic nanoparticles with large negative separation ratio psi = -3.5 heated from below. We show that transient localized states appear in the range of Rayleigh numbers 2200 < Ra < 3000. These states rotate rapidly around their axis and gradually shrink in size until the system returns in a purely conductive state. We discuss how these states are originated by the travelling waves arising from the competition between Rayleigh-Benard convection and the solutal stabilisation of the sample.

Transient Localized Rotating Structures in a Suspension of Highly Thermophilic Nanoparticles / M. Carpineti, S. Castellini, A. Pogliani, A. Vailati. - In: FRONTIERS IN PHYSICS. - ISSN 2296-424X. - 10:(2022), pp. 953067.1-953067.7. [10.3389/fphy.2022.953067]

Transient Localized Rotating Structures in a Suspension of Highly Thermophilic Nanoparticles

M. Carpineti
Primo
;
S. Castellini;A. Vailati
Ultimo
2022

Abstract

A thermophilic suspension of nanoparticles heated from below exhibits a complex stability diagram determined by the competition between the stabilizing flux of nanoparticles induced by thermophoresis and the destabilizing flux determined by thermal convection. We investigate Rayleigh-Benard convection in a suspension of highly thermophilic nanoparticles with large negative separation ratio psi = -3.5 heated from below. We show that transient localized states appear in the range of Rayleigh numbers 2200 < Ra < 3000. These states rotate rapidly around their axis and gradually shrink in size until the system returns in a purely conductive state. We discuss how these states are originated by the travelling waves arising from the competition between Rayleigh-Benard convection and the solutal stabilisation of the sample.
thermophilic nanoparticles; Rayleigh-Benard convection; travelling waves; localized structures; convectons
Settore FIS/03 - Fisica della Materia
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
INTLI20AVAIL_01 - Technologies for Non-Equilibrium Systems (TechNES) - VAILATI, ALBERTO - INTLI - Finanziamenti internazionali - 2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/939506
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