Shape dynamics of rotating polygons on the ...
Type de document :
Compte-rendu et recension critique d'ouvrage
DOI :
Titre :
Shape dynamics of rotating polygons on the surface of liquid nitrogen in a Leidenfrost state
Auteur(s) :
Bach, Jacob S. [Auteur]
Danmarks Tekniske Universitet = Technical University of Denmark [DTU]
Duchesne, Alexis [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN]
Bohr, Tomas [Auteur correspondant]
Danmarks Tekniske Universitet = Technical University of Denmark [DTU]
Danmarks Tekniske Universitet = Technical University of Denmark [DTU]
Duchesne, Alexis [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN]
Bohr, Tomas [Auteur correspondant]
Danmarks Tekniske Universitet = Technical University of Denmark [DTU]
Titre de la revue :
Comptes Rendus. Mécanique
Pagination :
457-473
Éditeur :
Académie des sciences (Paris)
Date de publication :
2020-11-16
ISSN :
1631-0721
Mot(s)-clé(s) en anglais :
Rotating polygons
Fluid instabilities
Free surface flows
Spontaneous symmetry breaking
Shape dynamics
Fluid instabilities
Free surface flows
Spontaneous symmetry breaking
Shape dynamics
Discipline(s) HAL :
Sciences de l'ingénieur [physics]
Résumé en anglais : [en]
When liquid nitrogen is set into rotation in a warm pot, the surface, initially forming an axis symmetrical, toroidal shape, spontaneously re-structures into a series of rotating polygons with a diminishing number of ...
Lire la suite >When liquid nitrogen is set into rotation in a warm pot, the surface, initially forming an axis symmetrical, toroidal shape, spontaneously re-structures into a series of rotating polygons with a diminishing number of corners, while slowing down. This spontaneous "ordering" occurs despite the violently turbulent and boiling state of the fluid. We show experimentally that these shapes are well-described as a sum of a few Fourier modes, and we present experimental results for the development of the frequencies and amplitudes of these wave-modes during the transient process. We compare our results with the theoretical results for the instabilities of a potential vortex flow and argue that the first polygon formed in the transient process should be described by this theory. The paper is dedicated to the memory of Yves Couder, colleague, friend and a life-long source of inspiration.Lire moins >
Lire la suite >When liquid nitrogen is set into rotation in a warm pot, the surface, initially forming an axis symmetrical, toroidal shape, spontaneously re-structures into a series of rotating polygons with a diminishing number of corners, while slowing down. This spontaneous "ordering" occurs despite the violently turbulent and boiling state of the fluid. We show experimentally that these shapes are well-described as a sum of a few Fourier modes, and we present experimental results for the development of the frequencies and amplitudes of these wave-modes during the transient process. We compare our results with the theoretical results for the instabilities of a potential vortex flow and argue that the first polygon formed in the transient process should be described by this theory. The paper is dedicated to the memory of Yves Couder, colleague, friend and a life-long source of inspiration.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Projet Européen :
Source :
Fichiers
- https://comptes-rendus.academie-sciences.fr/mecanique/item/10.5802/crmeca.24.pdf
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- https://hal.archives-ouvertes.fr/hal-03322812/document
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- CRMECA_2020__348_6-7_457_0.pdf
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- crmeca.24.pdf
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