albansauret.bsky.social
Associate Professor at UMD College Park, Department of Mechanical Engineering - playing with fluids, grains, powders and droplets
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5/ Read more :
🔗 Popular science article FR : www.espci.psl.eu/fr/actualite...
🔗 Full publication in PNAS: www.pnas.org/doi/10.1073/...
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And a video entry to the Gallery of Fluid Motion at the APS DFD 2023: www.youtube.com/watch?v=V0RJ...
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And bonus: the winning entry from @ramrajesh97 to the Gallery of Soft Matter @apsdsoft.bsky.social last year that shows some cool pictures with fiber suspensions
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Capillary flows of particulate suspensions are already complex, but anisotropic fibers add even more layers of complexity. We are excited to further explore fiber dynamics in various situations. Feedback and suggestions are very welcome!
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#3: Fiber coverage becomes uneven when increasing the volume fraction of fibers. Increased fiber overlap at higher concentrations reduces coating uniformity, despite fibers maintaining an isotropic orientation.
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#2: Higher Weber numbers and increased fiber fractions enhance splashing events. We map this splash/no-splash transition.
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#1: Increasing fiber concentration significantly reduces droplet spreading due to higher effective viscosity. Our findings extend existing spreading models of suspensions of spherical particles to account for fiber suspensions explicitly.
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We studied droplets of non-Brownian fiber suspensions at varying volume fractions and fiber aspect ratios. Using high-speed imaging and absorption spectroscopy, we quantified droplet spreading, film thickness, and coating uniformity.
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We hope this work advances our understanding of wave generation mechanisms, crucial for predicting natural disasters like tsunamis and glacier calving events.
You can also watch this video we previously created for the Gallery of Fluid Motion: www.youtube.com/watch?v=DuIn...
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We identified diverse wave phenomena: dispersive waves, solitary waves, breaking bores, and notably, slender water jets. When piston acceleration nears gravitational acceleration, we observed a transition to water jets—beyond traditional wave-generation models.
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Through lab experiments, we investigated how the sudden movement of a rigid wall (piston) creates water waves. Depending on speed, stroke, and water depth, we observed distinct wave regimes.
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Kevin will close out presentations with experiments on granular jets and their breakup.
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The final two talks will be on Wednesday and will focus on granular flows. Ram will present results on the gravity-driven flux of particles, or “How fast does your hourglass empty?”
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Sreeram will give the last talk of our group on Monday, presenting his work on fiber suspensions, based on his winning entry to the Gallery of Soft Matter last year!
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I will then discuss the extrusion of dense suspensions. When particles get too crowded, things can go wrong!
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Marc will kick things off in the Undergraduate Session, presenting experiments on drag in granular media.
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There will be some similarity ( surface tension and solidification) but since there will be no gas dissolved the volume of the trapped bubble will be constant and you will not observe very long shape. It would be closer to this : journals.aps.org/prl/pdf/10.1...
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Huge thanks to Virgile for leading this work! It was great collaborating with Jochem Meijer and Detlef Lohse. Many thanks to all who offered feedback (among other @devillesy.bsky.social) @pmmh-lab.bsky.social @univofmaryland.bsky.social @ucsbengineering.bsky.social @poftwente.bsky.social
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Why care about bubble shapes in ice? In polar ice cores, bubbles store past atmospheric data, helping decode climate history. Freezing processes matter in materials science, from foods to pharmaceuticals and cryopreservation
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Why elongated? The ice–liquid interface can “pinch” bubbles from multiple sides. Different freezing rates change how fast each region solidifies, causing elongation. Our model shows how growth rate and thermal gradients govern bubble geometry.
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As ice forms around an initial air pocket generated by nucleation, local conditions create an asymmetry in the ice front, producing non-spherical bubbles. They can range from near-spherical to highly elongated.
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Because water contains dissolved gas, air bubbles nucleate and grow during freezing. We investigated and modeled how these bubbles evolve as the freezing front advances, leading to shapes from pears to worms.
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This review, led by @ramsudhirsharma.bsky.social, explores the fundamentals of cohesion, methods for creating cohesive grains, and perspectives for future work. Bridging experiments and models is crucial, and we hope this will help experimentalists in their approach and motivate future studies!
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The forces at play depend on particle size. For powders, van der Waals forces dominate but are hard to control - especially with aerodynamic drag. Experimentally, model cohesion is achievable with capillary bridges, solid bonds, or polymer coatings.
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Developing new frameworks to describe the behavior of cohesive granular materials is needed. However, while simulations can rely on model cohesive force, experiments remain a challenge. How can we create and control inter-particle adhesion at both the particle and bulk scale?
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Fun fact! Is there any source for that?
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Beautiful!
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Oh cool! Would you mind sharing the photo of a freezing bubble?
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@sespagnolie.bsky.social has started a starter pack here : go.bsky.app/8Njfprh in case that helps!
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Super cool work! Congrats to all of you
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This one is also a good one (also less easy to use!)
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I really like the one you mentioned! I may use it in some introduction of talks at some point 😊
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Thanks !
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Sounds super interesting - when will it take place ?