video 1 (response measurement): https://aip.scitation.org/doi/suppl/10.1063/1.5129958/suppl_...
video 2 (picking up block): https://aip.scitation.org/doi/suppl/10.1063/1.5129958/suppl_...
video 3 (hexapod): https://aip.scitation.org/doi/suppl/10.1063/1.5129958/suppl_...
video 4 (human climbing tiled wall): https://aip.scitation.org/doi/suppl/10.1063/1.5129958/suppl_...
video 5 (human climbing concrete wall): https://aip.scitation.org/doi/suppl/10.1063/1.5129958/suppl_...
Also, wouldnt this be easily defeatable with small dowel protruding "thorns" - or dimples, as on a golf ball - maybe alternating convex/concave dimple patterns? or other ridges?
Will the seal slowly evaporate away or absorb into a porous surface like concrete?
[0] https://en.m.wikipedia.org/wiki/File:Phase_diagram_of_water....
Some more info: http://sciencechatforum.com/viewtopic.php?nomobile=1&f=77&t=...
I believe he has a couple of patents on the technology, but not sure he'll ever get around to making something practical with it.
I watched multiple of the videos he has listed and from what I can tell the phenomenon he is demonstrating is real and reproducible.
Whether or not he's crazy, who's to say?
Most of our current propulsion and lift mechanisms are based on momentum transfer, which has many problems in air. His work makes me think there are a lot more efficient mechanisms to be discovered.
https://aip.scitation.org/na101/home/literatum/publisher/aip...
https://aip.scitation.org/na101/home/literatum/publisher/aip...
(from the actual paper link from czr: https://aip.scitation.org/doi/10.1063/1.5129958)
One way of explaining it would be that instead of leaking air, it leaks sealing water without suffering dpressurization in the process. Really neat.
Whereas the suction cups in the article, use spinning water as a way to seal suction cups on rough surfaces (the water fills in crevices of rough surfaces I presume, allowing the suction cup to seal). The water is also spinning (i.e. it has an inertial force) so that it counteracts the vacuum pressure in the center of the suction cup.
Could anybody explain in more detail?
(Plus it looks much more sci-fi.)
I wonder if some sort of jelly would work to do the same thing, like a snail. Or a dynamic cup surface that conforms to the wall better.
Sounds like a "momentum transfer" vacuum pump, shaped so that the output side bleeds out along the rim.
https://en.wikipedia.org/wiki/Vacuum_pump#Momentum_transfer_...
As for the immersion blender, intuition should tell you that the same principle should/or at the very least… might apply. Now it could very well not apply (but I'm quite confident that it does). To really prove if it does or not, one would have to do the rigorous math involved, which would include deriving the stream function for the flow situation, verifying if conditions allow for applying Bernoulli's principle, then applying the principle and verifying if it matches experimental observations... This is would be non-trivial to do (judging simply by the geometries involved) so I'm not even going to attempt do this…
However, I’ll try explaining the gist of the idea:
Bernoulli’s principle basically states that, within a flow of constant energy, when a fluid speeds up, it is corresponded with a drop in pressure and vice versa. Now looking at the immersion blender, intuition (and essentially conservation of mass) suggests that the fluid should be moving fastest between the edges of the blender/blade and the boundaries of the container/cup (i.e. areas where there’s very little space near the moving blender parts). Outside these regions, intuition would suggest the fluid is moving relatively slowly (e.g. near the top of the water level in the container cup). Since the fluid appears to move, and likely cross these regions (i.e. undergoes speeding up/slowing down), Bernoulli’s principle states that we should expect to see a pressure differential between these regions, where faster moving water regions should be at a lower pressure (i.e. acting as a vacuum / suction cup).
But again, whether or not this idea is true and is valid would have to be mathematically and experimentally verified…
In this case, besides the appearances, what the guy is demonstrating in the videos seems legit.
Here's an earlier video where he explains what he believes is the effect at work, with a simple demonstration: https://youtu.be/I3g0CcLzC6I
It would be awesome if a youtuber like Steve Mould or Dustin from SmarterEveryDay did a video on this.
