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giovedì 23 febbraio 2023
# gst: hidden complexity during the twinkle of a shrinking droplet
giovedì 15 febbraio 2024
# gst: droplets scoot like caterpillars.
venerdì 26 gennaio 2024
# gst: compression and fracture of ordered and disordered droplet rafts
giovedì 8 ottobre 2020
# gst: observing the crystallization process in a droplet
venerdì 3 settembre 2021
# gst: apropos of transitions, when a liquid droplet takes a turn (as a swimming behavior of amoebas)
mercoledì 20 aprile 2022
# life: apropos of transitions, a leap from chemistry to biology, the hypothesis of self-assembling droplets, the 'droplet world'.
lunedì 10 luglio 2023
# gst: myriad of complex dynamics from the atomization of acoustically levitated droplets
giovedì 1 settembre 2022
# gst: apropos of transitions, evaporating binary microdroplets with phase segregation
martedì 22 ottobre 2019
# gst: the transition from quiescent spherical cap states to self-piloted motile states of volatile droplets
mercoledì 5 maggio 2021
# gst: when and how a levitating droplet sings (as a pipe)
lunedì 21 maggio 2018
# gst: the intricate dynamics of a splashing droplet
<< at all times, the rim thickness is governed by a local instantaneous Bond number equal to unity, defined with the instantaneous, local, unsteady rim acceleration. This criterion is found to be robust and universal for a family of unsteady inviscid fluid sheet fragmentation phenomena, from impacts of drops on various surface geometries to impacts on films >>
Wang Y, Dandekar R, et al. Universal Rim Thickness in Unsteady Sheet Fragmentation. Phys. Rev. Lett. 120, 204503. doi: 10.1103/PhysRevLett.120.204503. May 16, 2018.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.204503
<< Because all these features change constantly over a short period of time, extracting high-accuracy, unbiased measurements in the data is quite tricky (..) Classical algorithms are unable to capture all of these details >> Lydia Bourouiba.
<< In contrast, her team’s algorithms can automatically discern a splashing droplet’s rim and distinguish it from the smaller droplets that spray out from the rim, and the ligaments that form around the rim >>
Jennifer Chu. New theory describes intricacies of a splashing droplet. MIT. May 17, 2018.
http://news.mit.edu/2018/new-theory-describes-intricacies-splashing-droplet-0516
https://m.phys.org/news/2018-05-theory-intricacies-splashing-droplet.html
giovedì 31 ottobre 2019
# gst: spontaneous spin-sliding of volatile drops
giovedì 9 settembre 2021
# gst: apropos of unexpected thresholds, the minimum temperature for levitating a droplet
mercoledì 10 aprile 2024
# gst: exploring the on-demand dynamical generation of a plethora of dispersive shock waves arising in attractive one-dimensional droplet-bearing environment.
mercoledì 14 giugno 2023
# gst: apropos of transitions, droplet trajectories during single and collective bursting bubbles
sabato 6 marzo 2021
# gst: the dynamics of a collective bubble (in a foam) that collapse in a droplet
giovedì 23 novembre 2017
# gst: levitation in a temperature gradient: the two liquids don't mix
<< A drop or two of cold cream in hot coffee can go a long way toward improving one's morning. But what if the two liquids didn't mix? >>
AA << have now explained why under certain conditions a droplet of liquid should not coalesce with the liquid surface below. If the droplet is very cold, and the bath sufficiently hot, then the droplet should "levitate" on the bath's surface, as a result of the flows induced by the temperature difference >>
<< If you study that process mathematically, you can show the way in which temperature is changing in the droplet over time is exactly with this power law of 2/3 that we observed in our experiments >> Michela Geri.
Jennifer Chu. Study explains how droplets can 'levitate' on liquid surfaces. Nov 15, 2017
https://m.phys.org/news/2017-11-droplets-levitate-liquid-surfaces.html
Michela Geri, Bavand Keshavarz, et al. Thermal delay of drop coalescence.
Journal of Fluid Mechanics. 2017; 833 doi: 10.1017/jfm.2017.686 Nov 8, 2017.
venerdì 30 dicembre 2022
# gst: apropos of modulational instabilities, the case of vortex-ring quantum droplets in a radially-periodic potential.
giovedì 17 marzo 2022
# gst: apropos of weird transitions: from non-equilibrium conditions square droplets and liquid lattices can emerge.
sabato 24 agosto 2019
# gst: active drops: from steady to chaotic self-propulsion
<< Individual chemically active drops suspended in a surfactant solution were observed to self-propel spontaneously with straight, helical, or chaotic trajectories. (..) strong advection (e.g., large droplet size) may destabilize a steadily self-propelling drop; once destabilized, the droplet spontaneously stops and a symmetric extensile flow emerges. If advection is strengthened even further in comparison with molecular diffusion, the droplet may perform chaotic oscillations. >>
Matvey Morozov, Sebastien Michelin. Nonlinear dynamics of a chemically-active drop: From steady to chaotic self-propulsion. J. Chem. Phys. 150, 044110 (2019). doi: 10.1063/1.5080539. Jan 31, 2019. https://aip.scitation.org/doi/10.1063/1.5080539