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Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Etienne Jambon-Puillet, LadhyX
Pendant drops on the underside of wet surfaces : growth, motion and solidification
Pendant drops spontaneously appear on the underside of wet surfaces through the Rayleigh-Taylor instability. Due to their detrimental effect on coatings and their tendency to drip, several strategies have been developed to avoid their formation and rationalized with linear stability analysis. I will first briefly show how the Rayleigh-Taylor instability can be harnessed to make patterned elastic surfaces with a tunable spacing [1] and aspect ratio [2]. However, having a fine control over the drops in the non-linear regime of the instability is hard. They are connected to a thin film with which they continuously exchange liquid. They thus have no contact line and move around easily which disrupt the pattern. I investigate these drops dynamic experimentally, numerically and theoretically with a model system that consider a single pendant drop surrounded by a uniform thin film. I will show that under smooth surfaces, a transition from growth to decay occurs as the substrate inclination angle is increased by a few degrees [3]. I will then consider uneven surfaces, and show that the underlying topography can control the drop motion via gravito-capillary pinning-like forces [4].
[1] Marthelot, J., Strong, E. F., Reis, P. M., & Brun, P. T. (2018). Designing soft materials with interfacial instabilities in liquid films. Nature communications, 9(1), 4477.
[2] Jambon-Puillet, E., Piéchaud, M. R., & Brun, P. T. (2021). Elastic amplification of the Rayleigh–Taylor instability in solidifying melts. Proceedings of the National Academy of Sciences, 118(10), e2020701118.
[3] Jambon-Puillet, E., Ledda, P. G., Gallaire, F., & Brun, P. T. (2021). Drops on the underside of a slightly inclined wet substrate move too fast to grow. Physical review letters, 127(4), 044503.
[4] Jambon-Puillet, E. (2024). Gravito-capillary pinning of pendant droplets under wet uneven surfaces. arXiv, 2403.17584.
Séminaires (4)
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Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…)
Instructions générales pour les conférenciers
Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.
Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.
Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.
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