Mastodawn

What happens when two miscible liquids inside a droplet have different interfacial tensions?

A lattice Boltzmann study reveals spontaneous internal flows that break symmetry, accelerate mixing and reshape concentration patterns inside microdroplets.

🔗 https://doi.org/10.1063/5.0321035

#Microdroplets #FluidMechanics #InterfacialPhysics #Microfluidics #marangonieffect

LeidenForce 4d ago

Bubble rupture is not a single process but a sequence: hole opening, rim retraction, and jet focusing.

Surface tension accelerates all stages, while viscosity mainly determines whether the final jet survives or collapses.

https://pubs.aip.org/aip/pof/article/38/5/053329/3391634/Investigation-of-the-characteristic-velocities-of

#Matter #FluidMechanics #Instabilities #Jets #CapillaryFlows

LeidenForce Jun 9

What controls the shape of melting ice?

This study shows that infrared heating can trigger thermally driven Marangoni flows that sculpt melt ponds and channels in real time. A lab-scale window into processes relevant to glaciers and ice shelves.

🔗 https://pubs.aip.org/aip/pof/article/38/4/042113/3387138/Infrared-laser-induced-Marangoni-flow-programs-ice

#IceMelting #MarangoniFlow #SoftMatter #FluidMechanics #Cryosphere

LeidenForce Jun 9

How do conductive ionic liquid droplets behave under strong electric fields?

Experiments reveal major shape deformation before impact, while spreading and splashing remain surprisingly stable due to viscous damping.

🔗 https://doi.org/10.1103/b6n4-by38

#FluidMechanics #Electrohydrodynamics #ImpactDynamics #PhysicsResearch #ionicliquids

konstruct Jun 7

#FluidMechanics #FluidDynamics #AskFedi #DuckDuckFedi hey, I'm wondering which is better for cooling ? The desk isn't a perfect seal if you're wondering, air can vent, but slowly.

This computer is in a pull-push configuration, the GPU at the back is pulling fresh air in and the radiator is pushing hot air out as drawn by arrows. The radiator "pushing" fans are stronger than the GPU's "pulling" fans, so there is negative pressure, which means some air gets sucked in from surrounding case intakes (above, below etc).

#ComputationalFluidDynamics #FluidSimulation

LeidenForce Jun 4

Magnetic fields can dramatically reorganize fluid motion.

Using coupled fluid–thermal–structural simulations, this work shows how MHD effects suppress jets and vortices while altering heat transfer, mass transport and wall stresses.

🔗 https://doi.org/10.1063/5.0324488

#FluidMechanics #MHD #HeatTransfer #TransportPhenomena #Physics

LeidenForce Jun 2

How do suspended particles affect the tiny jets formed by bursting bubbles?

This study shows that nanoparticle- and microparticle-laden liquids behave very differently, revealing complex couplings between viscosity, surface tension, and interfacial stresses.

🔗 https://doi.org/10.1063/5.0315998

#FluidMechanics #BubbleDynamics #InterfacialFlows #Capillarity #aerosols

LeidenForce May 28

What do boat wakes and biological tissues have in common? A new study shows that ultrasoft solids support wake patterns similar to fluids, opening new possibilities for probing soft materials through surface waves.

🔗 https://phys.org/news/2026-04-ship-soft-tissues-exploring-fluid.html

#SoftMatter #WavePhysics #Biophysics #FluidMechanics #MaterialsScience

From ship wakes to soft tissues: Exploring fluid and solid surface-wave physics

A new study by scientists in the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) shows that when a pressure disturbance moves across an ultrasoft elastic material, such as a gel or a biological tissue, it generates a V-shaped wake that's strikingly similar to the waves that travel behind a boat.

Phys.org

LeidenForce May 27

Why can some fluids harden under impact?

Researchers tracked millimeter-sized cornstarch droplets hitting a surface and uncovered three distinct impact regimes, including a surprising liquid-to-solid transition during spreading.

🔗 https://phys.org/news/2026-04-droplet-impacts-reveal-physics-thickening.html

#Physics #FluidMechanics #SoftMatter #Rheology #ImpactDynamics

Droplet impacts reveal surprising physics in shear-thickening fluids

From ketchup to quicksand, non-Newtonian fluids have long fascinated and puzzled scientists. Unlike ordinary fluids, their flow properties change depending on how much force is applied, but the precise mechanics governing this behavior remain poorly understood—particularly under rapid deformation. Now, a team led by Xiang Cheng at the University of Minnesota has used droplet impacts to probe these dynamics in new detail, uncovering behaviors which have eluded physicists so far. Their findings appear in Physical Review Letters.

Phys.org