This Bizarre Fan Cost $1100?! - Piezoelectric Fan

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MUSIC CREDIT
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Intro: Laszlo - Supernova

Outro: Approaching Nirvana - Sugar High

CHAPTERS
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0:00 Intro
1:05 Piezoelectric Definition
3:39 Trying to Break it
4:40 The Advantages
6:19 Performance Testing
7:48 Cooling a PC with it
9:28 The Construction
9:59 Who Uses These?
13:00 Outro

[clapanse]

Worth noting: at 2:50, you say the mains power can be all over the place, but that's not at all true for frequency. Mains frequency is very tightly controlled, and basically never deviates by more than 0.1Hz. Large frequency deviations would cause huge blackouts and enormous problems with the grid. In addition, if that wall transformer were actually controlling frequency, it wouldn't have problems running in Europe either.

My bet is that it's just a transformer.

[freazyknight]

I used piezoelectric transducers in my thesis for water distillation desalination. It creates waves, which cause water to evaporate creating bubbles ( cavitations ) . Those bubbles also burst, which is great because water becomes atomized increasing surface area, which means even more evaporation rate increase.

You can read this water phenomena. It is a huge problem for rockets since it can damage places that has water.

[nwheatcraft]

The air crossing the heatsink is more affected by the venturi effect with the piezoelectric fan devices than traditional fans. Where the traditional fan lies directly on the surface of the heatsink allowing for nearly no air gap the fan must suck all of its air from behind which is a significantly lower amount of cubic space than the entire surface area of the pieozoelectric fan, the air around it, and the air between it and the heat sink that also must be moved.

[aaronmdjones]

2:40 The frequency of mains power isn't "all over the place". Here in the UK (50 Hz), great effort is expended in order to keep it between 49.9 and 50.1 Hz at all times. If it drops to 48.8 Hz (because the demand is exceeding the available supply, stealing rotational inertia from the grid's generators and slowing them down), they immediately start rolling blackouts (the Low Frequency Demand Disconnection scheme) in order to restore it. We're talking a couple of seconds between reaching 48.8 Hz and 5% of the country going dark. It's perfectly acceptable to rely on mains frequency being somewhat constant, and some timing devices do.

[bigclivedotcom]

I have a dual version of this in a suitable protective housing from decades ago. I think it uses 2 piezo blades in series for direct mains operation. I'll have to try and find it.
(It was from a surplus store.)

[mattbradshaw]

Would like to just clarify an offhand comment from Linus, wall power can very by about 5-10% in terms of voltage, but it is extremely regulated in terms of frequency. In the US and Canada you power will be with 0.1 Hz of 60 Hz.

[weltenkrank]

Well in the end you can lengthen the blade to get to the resonance frequency you would loose some hz in movement or transform to whatever you need. Would love to see how this thing works in an optimised environment with optimised suction and pressure side. Also would be cool to see how far you can push this principle in terms of more complex geometry etc.

[JonManProductions]

Can I say it again that the editors at LMG were trained well by Taran, and now they have been just ridiculous in the last couple of videos! :D

[jacobcooney]

I think these kinds of videos are a big step in the right direction. I didn't care much for all the lab stuff when it was announced, but if this is the kind of content you're going for, I'm a big fan.

[PrimyFritzellz]

Oh I can tell for sure that the editors are having so much fun with these new videos. It's such a nice sight to see that LTT is more meme-y these times and is just having fun

[MrStumpson]

7:33 The lab team is so good they know when Linus whispers about them. I'm impressed

[milkyy]

that fan must be really cool if it's $1100

[danmacdonald]

I love this kind of video.

Reminds me of the random one-off nonsense we'd have to work with in my instrumentation lab for nuclear inspection equipment. Such as paint on piezoelectric we played with for ultrasound.

Nostalgic and interesting!

[thomass.]

Sometimes I begin to think whether Linus is more into tech or more into the HVAC/moving heat

[LoveWins]

Now I would like to see all the blades on a heatsink doing this vibration. Imagine a CPU cooler with flat metal pieces coming off of it and vibrating to draw the air from the CPU.

[cuddlyfoxgirl]

6:06 Linus no longer just drops electronics, he now also drops people into a hypnotic trance :P

[Neoxon]

At the rate GPUs are increasing in power consumption & heat, we may need an entire PC build with expensive fans.

[kcutt]

~7:00 This is definitely related to Bernoulli's Principle. The moving air particles right after the tip collide with others and can create greater airflow further away, then it dissipates back down as it gets more and more spread out.

[itsTyrion]

1:36 idk why but that perfectly cut reverb scream was HILARIOUS

[sgt.wolfenstein]

I love the sound engineering in this video.