Dissipated power within a turbulent flow forced homogeneously by magnetic particles
| Autor: | Jean-Claude Bacri, Eric Falcon, Claude Laroche |
|---|---|
| Přispěvatelé: | Matière et Systèmes Complexes (MSC (UMR_7057)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
Materials science Particle number Computational Mechanics Magnetic particles FOS: Physical sciences Homogeneous forcing 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Experiment 0103 physical sciences Fluid dynamics 010306 general physics New forcing technique Fluid Flow and Transfer Processes [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph] Turbulence Fluid Dynamics (physics.flu-dyn) Fluid Dynamics Mechanics Physics - Fluid Dynamics Dissipation Nonlinear Sciences - Chaotic Dynamics Magnetic field Dissipated power Modeling and Simulation [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD] Magnetic nanoparticles Chaotic Dynamics (nlin.CD) |
| Zdroj: | Physical Review Fluids Physical Review Fluids, American Physical Society, 2017, 2, pp.102601(R). ⟨10.1103/PhysRevFluids.2.102601⟩ |
| ISSN: | 2469-990X |
| DOI: | 10.1103/PhysRevFluids.2.102601⟩ |
| Popis: | We report measurements of global dissipated power within a turbulent flow homogeneously forced at small scale by a new forcing technique. The forcing is random in both time and space within the fluid by using magnetic particles in an alternating magnetic field. By measuring the growth rate of the fluid temperature, we show how the dissipated power is governed by the external control parameters (magnetic field, and number N of particles). We experimentally found that the mean dissipated power scales linearly with these parameters, as expected from the magnetic injected power scalings. These experimental results are well described by simple scaling arguments showing that the main origins of the energy dissipation are due to viscous turbulent friction of particles within the fluid and to the inelasticity of collisions. Finally, by measuring the particle collision statistics, we also show that the particle velocity is independent of N, and is only fixed by the magnetic "thermostat". Comment: Rapid Communication |
| Databáze: | OpenAIRE |
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