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Author Topic: Flight  (Read 7449 times)

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AGelbert

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Re: Flight
« Reply #30 on: October 19, 2018, 02:45:25 pm »
 

New study reveals why dandelions are among the best fliers — they take to the air in a unique way

LAST UPDATED ON OCTOBER 19TH, 2018 AT 4:57 PM BY MIHAI ANDREI


SNIPPET:

Dandelions use a bundle of bristly filaments, called a pappus, to help keep their seeds aloft for dispersal. After the pappus takes to the air, it also prolongs the descent of the seed, enabling it to be carried much farther away. This is not uncommon in the plant world, as many other species employ a similar strategy — but they have a wing-like membrane instead of the spiky pappus.


So Naomi Nakayama, Ignazio Maria Viola, and colleagues set out to study exactly what happens to the dandelion flight. They constructed a vertical wind tunnel to visualize the flow around freely flying and fixed dandelion seeds, employing long-exposure photography and high-speed imaging to monitor any effects. They illuminated the seeds with a laser to make the entire system easier to visualize.

Researchers found that air does indeed flow through the bristles of the pappus, but the amount of air is very closely controlled by the spacing between the bristles, and this is very important. This particular structure formes a stable, doughnut-shaped air bubble, floating around each pappus. They call this air bubble a vortex ring.

Full article:

https://www.zmescience.com/science/news-science/dandelions-best-fliers-19102018/

Agelbert NOTE: Check out the video below to get a clearer understanding of what they disovered. 👀 🧐   

Rob not the poor, because he is poor: neither oppress the afflicted in the gate:
For the Lord will plead their cause, and spoil the soul of those that spoiled them. Pr. 22:22-23

 

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