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Why Ships Create Explosive Bow Spray Explained
Ship bow spray reaches 10-20 meters high at speeds above 20 knots due to extreme pressure zones and cavitation bubble collapse Kelvin's wake angle proves all ships—from dinghies to supertankers—create identical 39-degree V-shaped wakes regardless of size or speed Bow spray height increases with the
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Pacific Surf
Life in Venice Beach lends itself to wave-watching, or so it seems for photographer Craig Hubbard. (Image credit: C. Hubbard; via Colossal)
A Fluidic Space Telescope
A telescope's resolution is set by the size of its reflective surface. Our largest space telescope, JWST, has a 6.5-meter reflector, the largest we could manage given manufacturing constraints and the need to launch it in a rocket. To reach even larger sizes, researchers are considering a new type of reflector: one made of liquid. (Image credit: NASA; research credit: I. Gabay et al.)
Mirabilite Mounds at Great Salt Lake
In cold weather, a new geological feature has shown up at Utah's Great Salt Lake in the last decade. These salty mirabilite mounds form terraced crystals that resemble Yellowstone's Mammoth Hot Springs. (Video credit: Great Salt Lake Institute; image credit: Utah Geological Survey)
How Suspensions Remember
A new experiment elucidates the ability of some particle–fluid mixtures to behave in ways that depend on their previous flow.
Chocolate syrup and fresh concrete are examples of non-Brownian suspensions. Their particles are large enough and their fluids viscous enough that the thermal jiggling known as Brownian motion plays little role in their mechanical behavior. Instead, particle interactions predominate. Surprisingly, non-Brownian suspensions seem to have memory in that their response to a new stress can depend on how they flowed in the past. Now Surendra Padamata and Nathan Keim have studied this puzzling property in their lab at Pennsylvania State University [1]. They found that a non-Brownian suspension’s previously studied memories of the direction and amplitude of past flows are not distinct. Rather, the two recollections are aspects of the same nonequilibrium physics.
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Droplets Can Climb Sugar Fibers
In nature, droplets and fibers can meet on a spider's web, on fur, or on a dew-gathering cactus. Here, researchers explore what happens when the droplet can dissolve the fiber it's suspended on. As the authors note, a lumberjack who cuts the branch they sit on makes a fatal choice. The droplet sees a different outcome. (Image and research credit: S. Dorbolo et al.)
Inside the LA Aquaduct
In the early twentieth century, Los Angeles had capital and political willpower, but not water. So it built an engineering marvel, the LA Aquaduct, to guide water from the Sierra Nevadas down to the growing city. Grady gets into the literal (and figurative) ups and downs of the project in this Practical Engineering video. (Video and image credit: Practical Engineering)
"Tadpoles: The Big Little Migration"
In this short film, videographer Maxwel Hohn follows the migration of western toad tadpoles in British Columbia, showing their daily underwater journey from deep waters, where they can hide, to warmer, shallow waters, where they eat. (Video and image credit: M. Hohn et al.)
