Zobrazeno 1 - 10
of 111
pro vyhledávání: '"Ravelet, Florent"'
Autor:
Ravelet, Florent
Ce mémoire présente une synthèse de mes travaux de recherche effectués depuis ma soutenance de thèse en septembre 2005. L'ensemble s'articule autour de problèmes touchant aux écoulements turbulents, tant monophasiques que multiphasiques abord
Externí odkaz:
http://tel.archives-ouvertes.fr/tel-00915643
http://tel.archives-ouvertes.fr/docs/00/91/56/43/PDF/HDR_FlorentRavelet.pdf
http://tel.archives-ouvertes.fr/docs/00/91/56/43/PDF/HDR_FlorentRavelet.pdf
Autor:
Ravelet, Florent
Nous étudions ici expérimentalement l'écoulement de von Kármán, produit dans un cylindre entre deux turbines coaxiales. Nous nous plaçons plus particulièrement en régime de turbulence pleinement développée, pour un écoulement contrarotatif
Externí odkaz:
http://tel.archives-ouvertes.fr/tel-00011016
http://tel.archives-ouvertes.fr/docs/00/04/87/59/PDF/tel-00011016.pdf
http://tel.archives-ouvertes.fr/docs/00/04/87/59/PDF/tel-00011016.pdf
We present a detailed study of of a global bifurcation occuring in a turbulent von K\'arm\'an swirling flow. In this system, the statistically steady states progressively display hysteretic behaviour when the Reynolds number is increased above the tr
Externí odkaz:
http://arxiv.org/abs/1405.0813
Publikováno v:
Phys. Rev. Lett. 111, 234502 (2013)
We study the influence of the forcing on the steady turbulent states of a von K\'arm\'an swirling flow, at constant impeller speed, or at constant torque. We find that the different forcing conditions change the nature of the stability of the steady
Externí odkaz:
http://arxiv.org/abs/1301.1810
Publikováno v:
Journal of Fluids Engineering 136, 10 (2014) Paper No: FE-13-1291
Cavitation is a limiting phenomenon in many domains of fluid mechanics. Instabilities of a partial cavity developed on an hydrofoil, a converging-diverging step or in an inter-blade channel in turbomachinery, have already been investigated and descri
Externí odkaz:
http://arxiv.org/abs/1212.4243
Publikováno v:
Journal of Fluids Engineering 134 (2012) 104504
An experimental study on the design of counter-rotating axial-flow fans was carried out. The fans were designed using an inverse method. In particular, the system is designed to have a pure axial discharge flow. The counter-rotating fans operate in a
Externí odkaz:
http://arxiv.org/abs/1208.6396
Autor:
Chebel, Nicolas Abi, Masbernat, Olivier, Risso, Frédéric, Guiraud, Pascal, Ravelet, Florent, Dalmazzone, Christine, Noïk, Christine
The present work investigates free damped oscillations of an oil drop in water after its release from a capillary tube. Both pure heptane drops and diluted crude oil drops are considered (in the second case the interface is covered by amphiphilic spe
Externí odkaz:
http://arxiv.org/abs/0806.3030
Publikováno v:
Journal of Fluid Mechanics 601 (2008) 339-364
We study the transition from laminar flow to fully developed turbulence for an inertially-driven von Karman flow between two counter-rotating large impellers fitted with curved blades over a wide range of Reynolds number (100 - 1 000 000). The transi
Externí odkaz:
http://arxiv.org/abs/0801.3357
Publikováno v:
Physics of Fluids 22 (2010) 055103
We experimentally study the turbulent flow between two coaxial and independently rotating cylinders. We determined the scaling of the torque with Reynolds numbers at various angular velocity ratios (Rotation numbers), and the behaviour of the wall sh
Externí odkaz:
http://arxiv.org/abs/0712.2750
We study liquid-liquid dispersions in a turbulent Taylor-Couette flow, produced between two counterrotating coaxial cylinders. In pure Water and in counterrotation, Reynolds numbers up to 1.4 10^5 are reached. The liquids we use are a low-viscous Oil
Externí odkaz:
http://arxiv.org/abs/0707.1414