projectsomewhere
My random collection of virtual things
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Video reblogged from Fuck Yeah Fluid Dynamics
The reversibility of laminar mixing often comes as a surprise to observers accustomed to the experience of being unable to separate two fluids after they’ve been combined. As you can see above, however, inserting dye into a highly viscous liquid and then mixing it by turning the inner of two concentric cylinders can be undone simply by turning the cylinder backwards. This works because of the highly viscous nature of Stokes flow: the Reynolds number is much less than 1, meaning that viscosity’s effects dominate. In this situation, fluid motion is caused only by molecular diffusion and by momentum diffusion. The former is random but slow, and the latter is exactly reversible. Reversing the rotation of the fluid undoes the momentum diffusion and any distortion remaining is due to molecular diffusion of the dye.
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Photo reblogged from Cup with a moustache
Yay to @maze23 starting on Tumblr
Joe Blacks cup
Daring young moustache and his flying machine
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Photoset reblogged from pictures of the day
For the last 500 years, the locals of Nongriat in Meghalaya, India have grown several hundred bridges across the region’s numerous water channels, using just the roots of local ribber trees. Some of the bridges extend over 100 feet in length and are strong enough to support more than 50 people at a time.
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I am completely blown away by the coolness of this robot, fast forward to 2 minutes for the good stuff.
When you think how hard it is to get robots to stand on 2 legs, imagine the difficulties involved in making a robot which can fly just like a bird… flapping wings and all!
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