Turbulence and Bioluminescence

If you’ve ever seen crashing waves glowing blue, you’ve been treated to bioluminescence. Although many creatures can bioluminesce, tiny dinoflagellates–a type of marine phytoplankton–are one of the easiest to spot. These microscopic organisms create a flash of light in response to viscous stresses. Their response to flow-induced stresses is so robust that they can be used to visualize stress fields.

In a new study, researchers explored how turbulence affects the dinoflagellate’s luminescence. They mathematically modeled the dinoflagellate as an elastic dumbbell that emitted light based on its extent and rate of deformation. Then they explored how this model dinoflagellate behaved in different types of turbulent flows. They found that the fluctuations and intermittency of turbulent flows both encouraged the radiant displays. (Image credit: T. McKinnon; research credit: P. Kumar and J. Picardo)

Oil droplets in deformable tubes can be mobilized via hydrodynamic or wall actuation. Simulations show resonance can minimize transport time, a step toward precise droplet control in biomicrofluidics.

🔗 https://journals.aps.org/prfluids/abstract/10.1103/rbhz-c4mr

#microfluidics #droplets #fluiddynamics #simulation #resonance

[ Altano ]

Pendante ... elen
dum liberatempo,

Supren bluĉielo
super nubmaro

Suben kovrita
la tutan valon,

Panoramo sunteraso
ŝvebas ... pendante.

~kantilevero~

\eZ

#miksang #dailypic #aphotoaday
#Esperanto #photography #photo
#winter #snow #ski #skibum #alpine #alps #mountains #valley #cloudy #cloud #clouds #seaofclouds #seaofcloud #above #aboveclouds #bluesky #clearsky #clearskies #fluids #fluiddynamics #inversion #inversionlayer #dewpoint #panorama #terrace
#hangingout
#cantilever

[ Inversia Tavolo ]

Ubako estas, pro krutaj flankoj kaj suden lokitaj montaroj, tiuj partoj de la valo kiuj neniam vidas la sunon, ĉar la monto ŝtelas la tutan lumon.

Je nubmaraj tagoj estas tre evidente vidi kie la suno neniam brilas. Bonas scii ke tie, la neĝo protektita, daŭras la plej longan tempon.

~montumbro~

\eZ

#miksang #dailypic #aphotoaday
#Esperanto #photography #photo
#winter #snow #ski #skibum #alpine #alps #mountains #valley #cloudy #cloud #clouds #seaofclouds #seaofcloud #above #aboveclouds #bluesky #clearsky #clearskies #fluids #fluiddynamics
#inversion #inversionlayer #dewpoint
#iykyk #ifyouknowyouknow
#bananaforscale
#ubac #schattenseiten #wherethesundontshine

Interessantes Muster in einer Pfütze mit einem Wasserzufluss. Das weiße Material scheint mir Blütenpollen zu sein, welches auf der Wasseroberfläche schwimmt.

#Fotografie #photography #fluiddynamics #wasser #water

https://flowviz.tumblr.com/post/63744156375/posted-june-3rd-rayleigh-taylor-in-the-bathroom#notes

#fluiddynamics #photography

[ Inversia Tavolo ]

Kiel likvaĵo, nuboj foje ŝprucas tien kaj reen ene de la valo, kaptilois kaj kovrita de pli malvarman klaran tavolon, kiu simple ne miksiĝas.

Tiaj tagoj la montoj estas nur insuloj en nubmaro.

~limapartigo~

\eZ

#miksang #dailypic #aphotoaday
#Esperanto #photography #photo
#winter #snow #ski #skibum #alpine #alps #mountains #cloudy #cloud #clouds #seaofclouds #seaofcloud #above #aboveclouds #bluesky #clearsky #clearskies #fluids #fluiddynamics
#inversion #inversionlayer #dewpoint

“The Haboob”

Haboobs are a dust storm driven by the strong winds at the forefront of weather fronts and thunderstorms. Those powerful winds pick up dust in arid and semi-arid landscapes, creating billowing, turbulent clouds that appear downright apocalyptic.

This particular haboob formed in Arizona in August 2025 and was caught in timelapse by photographer and storm chaser Mike Olbinski. The visuals–as always–are incredible. Definitely watch to the very end, as the haboob advances on the runway at Sky Harbor Airport. The tension is palpable as you watch flights line up and try to make it off the ground before the haboob swallows them. (Video and image credit: M. Olbinski)

How do you identify flow regimes in a condensing steam jet? A new study uses chaos analysis to distinguish stable jets, oscillating jets and bubbly flow using just two parameters.

A simple way to track complex vapor–liquid dynamics.

🔗 https://pubs.aip.org/aip/pof/article/38/2/024119/3380433/Flow-pattern-recognition-of-condensing-steam-jet

#FluidDynamics #TwoPhaseFlow #Condensation #HeatTransfer #PhysicsOfFluids

Thunderstorms Make Trees Glow

Scientists have long hypothesized that the high electrical charge of thunderstorms could produce an opposite charge in the ground that would discharge from the forest canopy. But this phenomenon, known as a corona, had never been observed on actual trees. A new study, however, has observed this ghostly ultraviolet (UV) glow from the tips of sweetgum leaves and loblolly pine needles during thunderstorms.

Catching these coronae in action required a new kind of UV detector that was ultra-sensitive to the particular band of UV-light emitted by coronas, hot fires, or mercury lamps. Since the latter two weren’t present during the team’s field observations, they were able to conclude that the light they detected came from coronae.

The group observed that corona discharges were transient, jumping from leaf to leaf and branch to branch across the forest canopy. For any creature capable of detecting that glow by eye, it must be incredible to watch the treetops lit by their own ever-shifting auroras during every thunderstorm. (Image credit: W. Brune; research credit: P. McFarland et al.; via SciAm)