“Quiet Pulse” and “Another World”

Light shines dimly through the wall of an ice cave in this photograph by Marie-Line Dentler. Shaped by melting, pressure, freezing, and fracture, these structures are dynamic and ethereal. (Image credit: M. Dentler; via Colossal)

Observing Ice Giant Atmospheres

Uranus is one of our solar system’s oddest inhabitants, stuck spinning on its side with a tilted and offset magnetosphere. To better understand it, a team observed the planet for 17 hours with JWST. The near-infrared measurements gave new insight into the planet’s ionosphere, where auroras form. They found that temperatures peaked between 3,000 and 4,000 kilometers, while ion densities peaked at 1,000 kilometers. They also confirmed previous observations that Uranus’s upper atmosphere is cooling down. (Image and video credit: ESA/Webb/NASA/CSA/STScI/P. Tiranti/H. Melin/M. Zamani; research credit: P. Tiranti et al.; via Gizmodo)

https://www.youtube.com/watch?v=3jsn1829OPw

Bioconvection

Convection isn’t always driven by temperature. Here, researchers explore the convective patterns formed by Thiovulum bacteria. These bacteria are negatively buoyant, meaning they will sink if they aren’t swimming. They also have an asymmetric moment of inertia, so any flow moving past them tends to affect their swimming direction.

When let loose in a Hele-Shaw cell with a oxygen levels that decrease with depth, the bacteria create complex convection-like patterns. They swim slowly upward in wide, slow plumes and sink in denser, narrow plumes. In other areas, they form large-scale rotating vortices. (Video and image credit: O. Kodio et al.)

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