Daily Archives: June 11, 2020

Video shows Boost mobile store looted in the Bronx

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In the Bronx, video shows looters smashing through the front window of a Boost Mobile store. It happened Monday, June 1 at 5:45 p.m. at the location on Bruckner Boulevard. Once inside, the looters removed $2,700 in cash and an undetermined amount of electronic equipment
Eyewitness News ABC7NY News video.


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Cab driver attacked, slashed by group in Staten Island

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Police are searching for a group who attacked a cab driver on Staten Island and stole his car. The NYPD released pictures of two of the people involved. They say the group of four attacked the driver during a dispute last Thursday on South Avenue in Graniteville. Police say one of the people involved slashed the driver’s hands with a knife. When he got out of the vehicle to try to escape, the group took off in his 2012 Red Ford Explorer…
ABC7NY New York News video.


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Turbulent Flow is MORE Awesome Than Laminar Flow

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Everyone loves laminar flow but turbulent flow is the real MVP. A portion of this video was sponsored by Cottonelle.
I got into turbulent flow via chaos. The transition to turbulence sometimes involves a period doubling. Turbulence itself is chaotic motion, it is unpredictable and sensitively dependent on initial conditions. What surprised me is all the ways turbulent flow is useful to us. It is diffusive, meaning it causes mixing. This is useful in jet engines or rocket nozzles (which Destin studies) and is important to achieve in microfluidic devices, which are so small that turbulent flow is actually difficult to achieve. Turbulent flow can energize a boundary layer, which is important to maintain flow attachment over a wing, maintaining lift and delaying stall. Similarly a turbulent boundary layer over a golf ball reduces pressure drag allowing golf balls to fly further. This is the reason for the dimples on golf balls. Flow transitioning to turbulence in the wake of a bluff body can create periodic vortex shedding.
This beautiful phenomenon can be seen in the von Kàrmàn vortex street in clouds viewed from space. Turbulence is everywhere, in the air currents in a room, in your aorta, in the breaths you exhale, in oil pipelines and water pipes, in the flow over cars and ships and planes. Animals have evolved for it (like dead fish swimming up stream) and we have engineered our environment, our planes and golf balls for it. Laminar flow may be nice to look at (which is why we use it in decorative fountains) but turbulent flow does the real lifting. Animations by: Jonny Hyman (Sun, Jupiter, Reynolds, airfoil, Earth time-lapse) Research and writing: AJ Fillo and Derek Muller. AJ also created the wind tunnel golf ball shots Filmed by: Daniel Bydlowski and Derek Muller Additional footage: Images of Jupiter courtesy of NASA Turbulence in air currents by the Physics Girl, Dan Walsh, and Grant Sanderson

Veritasium video


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