New suction-cup system spins water to stick to rough surfaces

Post by logicallee » Mon, Jan 20, 2020, 7:03 AM UTC

czr wrote: post #6

actual paper https://aip.scitation.org/doi/10.1063/1.5129958 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/10.1063/1.51299…

Post by Iv » Mon, Jan 20, 2020, 7:22 AM UTC

raihansaputra wrote: post #12

Quick links to diagrams explaining how it works: 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 )

Post by Tepix » Mon, Jan 20, 2020, 8:32 AM UTC

keanzu wrote: post #8

czr wrote: post #6

actual paper https://aip.scitation.org/doi/10.1063/1.5129958 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/10.1063/1.51299…

The videos are great, consumes a lot less water than I imagined. Seems like most of the water is lost during the de-suction process, if they can scavenge that it could really cut the water consumption down nearly to zero.

Post by pretty_bubbles » Mon, Jan 20, 2020, 9:21 AM UTC

samstave wrote: post #10

keanzu wrote: post #8

Earlier quoted context omitted.

The videos are great, consumes a lot less water than I imagined. Seems like most of the water is lost during the de-suction process, if they can scavenge that it could really cut the water consumption down nearly to zero.

If they have an additional ring around the outside of each cup, could they not suction the water back into the system? 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?

Post by jtbayly » Mon, Jan 20, 2020, 11:55 AM UTC

Rury wrote: post #5

catalogia wrote: post #3

Is this the same mechanism as the immersion blender trick? ( https://youtu.be/TrZyuCh9df0?t=424 )

No, I believe the immersion blender trick can be explained by https://en.wikipedia.org/wiki/Bernoulli%27s_principle 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 i…