The Extraordinary Flight of Dandelion Seeds

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Tiny as they are, the bristly parachutes of a dandelion seed can help it fly tens of kilometers. The secret to this superpower is a new type of vortex ring, one researchers had never before observed in nature. With this video, FYFD kicks off an entire week of plant-focused physics. Check out the rest at:
fyfluiddynamics...
Featuring research from Cummins et al., "A separated vortex ring underlies the flight of the dandelion," www.nature.com...
Written, hosted, produced, edited, and animated by
Nicole Sharp, PhD
#FYFD #dandelions #vortexring #plantphysics
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Curious about that underwater shot at the end? Check out the full video at: • Under Pressure at the ...
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Thanks to my Patreon patrons and FYFD supporters who help make FYFD and FYFD video possible!
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Research footage:
Cathal Cummins
Madeleine Seale
Alice Macente
Daniele Certini
Enrico Mastropaolo
Ignazio Maria Viola
Naomi Nakayama
Oleksandr Zhdanov
Additional footage:
US Navy
NASA Jet Propulsion Laboratory
Nicole Sharp
Andrew Dickerson
A.J. Fillo
Oregon Coast Aquarium
Oregon State University
Sound effects from zapsplat.com

Опубликовано:

3 окт 2024

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Комментарии : 38

@dragoncurveenthusiast 5 лет назад

I love learning about these things on your channel! It's so far away from my own field, but so interesting! Thanks!

@cantthinkofnameyeah7249 5 лет назад

I love this channel amazing I would love to try and apply this to many uses.

@Bowpair2 5 лет назад

Super interesting! I love the tiny dandelion seed wind tunnel x)

@fyfluiddynamics 5 лет назад

I know, right?! Makes me want to build a little counter-top wind tunnel.

@michel12371 4 года назад

I just discovered you at the DFD, your videos are amazing. You deserve more followers.

@flymypg 5 лет назад

I used to fly paragliders, which rely on finding rising air to stay aloft. Sometimes you can "see" the air, such as the dust entrained by a dust devil at ground level. And at higher level, every cumulus cloud you see is the result of a column of air rising until the warmer and wetter lower air reaches it's condensation altitude (which is determined by the atmospheric "lapse rate"). That handles the top and bottom of a column of lift, but what about the middle? Sure, you can fly around looking at the geography below that is being warmed the most by the sun, and the points toward which that warm ground air may be pushed by other breezes, but that's a calculated risk (that often pays off, with practice and skill). Best of all is seeing a dandelion seed ascending nearby, or a soaring bird, then banking to share it's lift column. "Hey little feller! Mind if I tag along?"

@fyfluiddynamics 5 лет назад

You actually find them all the way up there? That's awesome! Thanks for sharing.

@kenadams5064 5 лет назад

At this point, I kinda envy your capacity to survey the literature. Keep at it. you give prospective researchers the hope to find interest in everyday problems !!

@fyfluiddynamics 5 лет назад

To be honest, I feel like I have an easier time of it than a lot of researchers. If I don't think the paper is interesting enough, I can just put it down! And even when I don't, there's a good chance that I'm skimming rather than digging into all the nitty-gritty details. Compared to the way I read papers that were relevant to my PhD topic (or the way I have to read them when reviewing them), it's much lighter.

@davidbuschhorn6539 5 лет назад

I found that if I took a barbecue lighter and burned the puffs off the dandelion seemed to stop making flowers. Also it's really satisfying as the puffs occasionally go up with a little [WHOOMPH]. The seeds stay attached to the head as well.

@fyfluiddynamics 5 лет назад

Hmm.... :looks at her front yard:

@GlassTopRX7 5 лет назад

@@fyfluiddynamics The chances of cancer should be lower than Roundup you can even do it somewhat green by using a large quality magnifying glass on a sunny day.

@fyfluiddynamics 5 лет назад

@GlassTopRX7 The issue is more that I live in a dry climate and setting fire to things next to my house is not a great idea ;-)

@davidbuschhorn6539 5 лет назад

@@fyfluiddynamics Here's me doing it. I was just beginning to lose my voice (ALS is great) but I could still be understood :) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NyXJ_hIzkV4.html

@visamap 3 года назад

Thank u all very much

@osamarais606 5 лет назад

Incredible!

@dylanparker130 11 месяцев назад

Nature still has secrets! Wonderful!

@keghnfeem4154 5 лет назад

Really great stuff. I was thinking of periodic structures to modify vortex. Like periodic post in the beach to keep the sand from eroding away the beach. Interesting. You are a better physics girl now!

@agimasoschandir 4 года назад

I wonder if that could be scaled up to human size

@LORDVADER357 3 года назад

So we can design human parachutes/flight systems based on same. 100 strings pointed at 100 different directions, each 7 meters long and no more than 1,6 mm in diameter. Basicly we upscale all by x1000. This should support an adult human. Basicly will be net of ropes and not solid parachute.

@nadiatalbi3802 2 года назад

سبحان الله وبحمده سبحان الله العظيم بديع السموات والأرض كل شئء خلقه بإتقان وتقدير

@arnold-pdev 5 лет назад

I figured that the porosity was to lower weight while maintaining drag through high relative boundary layer thickness around the spokes of the seed. I had no idea about the vortex ring!

@fyfluiddynamics 5 лет назад

You're exactly right about the porosity and high boundary layer thickness around the filaments being important - it just turns out that it also helps set up this vortex ring!

@arnold-pdev 5 лет назад

@@fyfluiddynamics Right, that boundary layer is what introduces the vorticity, so it's definitely important. It's also interesting how much the genetic "solution" changes based on the weight of the seed payload involved, perhaps due in part to the physical scales (but also probably due to genetic solutions only being local, not global optima). For instance, there is a whole class of much heavier seeds that have appendages like insect wings which rotate on their way down, generating apparently substantial drag through this rotation to slow their descent.

@wafaamohammed1230 2 года назад

سبحان الخالق العظيم.. خلق فأبدع فأعجز

@MidtownSkyport 5 лет назад

fascinating!

@donepearce 5 лет назад

More please! I want to know more about this. Does the effect scale, and if so how much? Can e use this effect?

@fyfluiddynamics 5 лет назад

Great question! Right now it looks like the effect is most useful at small scale, so we probably wouldn't go much larger/heavier than dandelion seeds. That said, there's still practical applications for something like that, including dispersing tiny sensors when, say, exploring other planetary bodies.

@donepearce 5 лет назад

@@fyfluiddynamics I can see that the cube vs square law would limit the size, but as you say, on other planetary bodies if we restrict this to ones with denser atmospheres (OK, not too may of those around), then the scale could certainly increase. Nano-scale sensors are not a problem, but transmitters powerful enough to return data certainly would be.

@fyfluiddynamics 5 лет назад

@@donepearce Check out the KickSat project. It's an example of micro-sized sensors being developed for space exploration. I'm imagining some larger probe that would release a bunch of those, collect their signals, and beam data back.