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594,015 Views • Mar 26, 2024 • Click to toggle off description
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Views : 594,015
Genre: Science & Technology
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Uploaded At Mar 26, 2024 ^^
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RYD date created : 2024-09-09T16:17:49.932741Z
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366 Comments
Top Comments of this video!! :3
I read that these spirals were devised following research into the collapse of the Emerly Moor transmitting mast in 1969. The mast was a tubular steel one and although initial indications that ice build up cause the collapse further investigations showed constant weakening over a number of years because of vortex shedding.
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On calm days they have a secondary unintended effect. As there is minimal airflow past the chimneys, they heat up more. Hot air being less dense, rises. As there are helical fins, the air starts to spiral, essentially creating a relatively low velocity vertical jet, assisting the exhaust gasses and particles to be ejected higher rather than falling towards the ground.
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I learnt about this because there was a very low frequency vibration in my house on windy days. Took months to locate. Was the tubular bars resonating on a metal gate attached to building wall. Impressive amplitude & power.
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Steve Mould is perfect for YouTube shorts. One of my favourites
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Also found on older automobiles radio antennae. In certain conditions, especially rain (personal experience), the vortex shedding vibrates the antenna so violently that it fatigues at the base and snaps off, never to be seen again! That's the antennae that don't have the helix in place and today's vehicles have little stubby ones without the need.
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This man’s is one of the very few creators who can produce a short video that is actually informative and worth watching.
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going on a walk with this man must be so interesting every time
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It's especially a problem for multiple chimneys in a row, where a downwind chimney can itself resonate wider than the first due to the oscillating vortices from upwind.
It's called a "Karman vortex street"
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Yes. Hanging bridges cables have such a helix to avoid resonance.
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I work in a factory with those kind of stacks. I've wondered for years what the fins were for!
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thank you for this. I was literally trying to explain this to my mother about why that design feature exists but I wasn't able to fully articulate how you are. thank you, science educator Steve Mould!
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Ex subsea pipeline engineer here. The specific reason the helical fins work is that the VIV (vortex induced vibration) frequency is proportional to the diameter (amongst other things). When viewed like a shadow, the fluid sees a varying diameter, so the vibration cannot lock in at the resonant frequency of the structure.
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Love your style, presentation and speech, refreshingly easy to listen to, unlike many youtubers at the moment.
Nice one fella!!
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It's called VIV vortex induced vibration. Same for subsea risers
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Thank you! There are some light poles at my work that wobble when the wind is just right. Now I understand why.
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This vortex shedding has a large part in flag flapping
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Same reason you see this on car antenas. At the right speed it starts to oscilate violently. The spiral also eliminates the high pitch whistle noise that any thin stick makes when swang suddenly. Without the spiral vortex breaker, that sound would be made continuously.
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In German it's called 'Kármáns Vortex Street'. Pretty clever bloke that Kármán.
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Chimneys also fell down a lot whenever Fred Dibnah was around 😂
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@damnecuadorian
7 months ago
I spent an embarrassingly long time looking for a chimney on the ship
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