Physique des mouvements naturels dans les fluides · 2020. 1. 30. · Physique des mouvements...
Transcript of Physique des mouvements naturels dans les fluides · 2020. 1. 30. · Physique des mouvements...
Physique des mouvements naturels dans les fluides
Mouvements collectifs en environnement complexe, Physique des écoulements dans les végétaux, Foule et interactions: des nageurs aux bulles, Hydrodynamique de micro-nageurs, Le plancton pour la physique
GDR : Physique des Plantes /Liquides aux Interfaces / Polymères & Océans / Microfluidique / Mephy
Séchage/cavitation des feuilles Dollet, Marmottant
Brodribb (Tasmanie), Cochard, Badel (Inrae)
Microalgues et milieux complexes Peyla, Rafaï Bertin, Coasne (LIPhy-PSM)
Foule de Micronageurs Peyla, Rafaï Faure (Maths, ENS), Maury (Maths, Orsay)
Bulles, Acoustique & Microstructures 3D
Dollet, Marmottant, Stephan Bossy (LIPhy-Optima)
Plancton luminescent & fluides complexes
Peyla, Rafaï Bodiguel, Pignon (LRP, Grenoble)
Synthèse Nageurs interfaciaux biomimétiques
Stephan Lambert (Bruxelles)
Sloshing in a Hele-Shaw cell: experiments and theory
–5 –4 –3 –2 –1 0 1 2 3 4 5cm
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FIGURE 1. (a) Sketch of the experimental set-up. (b) Raw image of the air/liquid interface,taken from the experiment without added glycerol and at a forcing frequency of 3.5 Hz.(c) Binarized image obtained after thresholding.
Solution Composition Kinematic viscosity Density Temperature(mm2 s�1) (g cm�3) (�C)
1 Base fluid(95 % ethanol + 5 % isopropanol)
1.7934 0.8047 21.0
2 Base fluid + 5 % glycerol 2.2783 0.8305 20.03 Base fluid + 20 % glycerol 3.7069 0.8807 20.54 Base fluid + 25 % glycerol 6.4688 0.9294 20.05 Base fluid + 30 % glycerol 11.853 0.9786 20.06 Base fluid + 40 % glycerol 15.319 0.9997 20.57 Base fluid + 45 % glycerol 21.388 1.0225 20.08 Base fluid + 55 % glycerol 40.594 1.0697 20.59 Base fluid + 62 % glycerol 63.428 1.0987 20.5
TABLE 1. Physical properties of the solutions used at the temperature of the experiments.
2. Experimental methods
The experimental set-up used to generate the sloshing waves in the narrow containerand to measure the free-surface displacement is shown in figure 1(a). A Plexiglas cellof height H = 15 cm, length `= 10 cm and width ⇣ = 0.3 cm is fixed to a single-axislinear motion actuator (Aerotech PRO 165). The container is partially filled from thetop with a column of liquid of height h0 = 10 cm, that is of the same order as thecontainer’s length, h0 ⇡ `, in order to limit viscous dissipation at the bottom of thecontainer. Indeed, the effect of a finite depth h0/` enters the eigenfrequency of thefundamental mode, which is the most sensitive to finite-depth effects, through a factorp
tanh (ph0/`), which equals the infinite-depth limit within less than 1 % for h0 = `(Ibrahim 2005). We use different solutions of 95 % ethanol plus 5 % isopropanol thatis mixed with glycerol (0 %, 5 %, 25 %, 40 %, 45 %, 55 % and 62 % in volume ofglycerol). The properties of the different solutions are measured with an Anton Paarviscosimeter (SVM 3000) and summarized in table 1.
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Amortissement du ballottement
Dollet Lorenceau (LIPhy-Modi)
Gallaire (EPFL)
Bancs de poissons & écoulement
Peyla, Quilliet Dupont (LIPhy-Optima)
Mécanique de coques molles
Quilliet Coupier, Etienne, John (LIPhy-MC2)
Composition
Benjamin DOLLET Laeticia GREDY Philippe
MARMOTTANT Philippe PEYLA
Catherine QUILLIET Salima RAFAÏ Olivier
STEPHAN
Edouardo AL ALAM
(doct.) Monica BRAVO
(Post-Doc) Guillaume AMIEUX (stag.)
Ummahan SELMAN (stag.)