Its true there is a fan in the base of all bladeless fans, but the fan is smaller then traditional fan designs and moves the same if not more air then traditional fans.
Air is pulled in through the base and forced through a thin slit. This fast stream of air creates an area of low pressure, drawing in and amplifying surrounding air behind the slits.
Because air “sticks” to itself, when you get some air moving (by breathing out, for example), the initial bit of air that you move “drags” some air with it from beside and behind. This is what Dyson calls “air multiplier technology”.
Dyson uses this property of air to claim that they only have to move a fraction of air (with the fan in the base) of all the air that blows past you.
Here is a example of how this works, and how you can use one breath to fill a large bag.
Here is a image of the multiplier effect, from the original intake of air at the bottom. You can see the air is multiplied from behind and infront of the fan.
And yet despite the fact that they’re using less electricity and a smaller fan somehow the product costs five times as much as a normal fan. How does that work?
Partly because of the overall quality of the fan. Like you can go to Walmart and get a comparable bladeless fan for 49.99 but it’s gonna be louder, won’t be as efficient and won’t last as long.
Speaking of the dyson. IMO one of the worst fans out there: extremely weak (see measurements on YouTube), extremely loud and very fragile…
Have one in the office, and I hate it…
A classic fan, fraction of the price performs better in all relevant categories…
Btw. They also create a “bigger” airflow around them so in that regard not better…
I’ve never really understood this multiplayer thing, sounds like a free energy gimmick. You can move more mass at the same speed without putting in more power.
Basically they’re trying to claim that the Bernoulli principle is some amazing concept that only they’ve come up with.
Their fans do work in the sense they do move more air but it creates so much back pressure that most of that air movement is lost. So you might as well not bother.
Well in fluid dynamics you don’t really make the distinction between liquid and gas. You can model air as basically just a very low viscosity fluid and it works. No one really knows why it works because it shouldn’t, air doesn’t stick to itself, but if you pretend that it does the simulations still work, even though they’re wrong.
If you look in most physics textbooks even at quite a high level they will tell you that aircraft fly because air sticks to itself, but again, it doesn’t. No one is quite sure why aircraft work, no one’s all that certain where the lift comes from. But physics textbooks hate to admit that so they just pretend that air sticks to itself.
You’re basically trading energy to move higher volume of air. The fan can move smaller amount of air at higher speed, but larger amount at a gentle breeze feels nicer and helps with circulating the air in the room better.
You could achieve it by taking that exact motor and slapping a bigger fan onto it, but that looks less cool and probably produces more noise? Maybe there’s some efficiency differences if the motor is better at spinning fast, but as a spherical cow in vacuum it should be similar.
It’s cheaper to make electric motor spin fast with low torque than slow with high torque, a ceiling fan of the same cfm needs a bigger motor than a standing fan.
still a miss-labeling to call them bladeless fans, just because the blades are hidden. by that logic my beef raviolis are vegetarian (tbf: the catholic church made a similar claim during the medieval ages).
Bernoulli Fan is not only more accurate, it also sounds much cooler.
To play devil’s advocate, there are no exposed blades at the point of use. I’d wager people who buy “bladeless” fans are more concerned with aesthetics and avoiding a crying toddler than they are with semantic accuracy. We call Wi-Fi “wireless” even though the router is plugged in.
at work we have expensive fans with a cheap metal mesh around them - to avoid a crying co-worker. at home i have a cheap tower fan with a weird plastic mesh - there are no visible blades on it except if i crank my neck into a really uncomfortable position and shine a flashlight into it. which one of the two can i call bladeless?
luckily i already have a devils advocate and @arctanthrope@lemmy.world dropped the name of god. how well do i need to hide my fans blade to create a Ventilationbescheißerle?
beavers are also a funny thing: it swims, therefore it is a fish. fish aren’t animal.
i was more referencing things like @arctanthrope@lemmy.world expanded: hiding meat in dough. funny how many strategies they had to cheat a supposedly all-seeing, all-knowing entity.
Well, Beef comes from cows, and cows only eat vegetation, so beef raviolis are vegetarian. Now, I’m not a Rocket Biologist, but I think the math here is pretty conclusive.
You know … Bernoulli Fan - that’s way better idea than a room full of MBAs from expensive business schools and months of market research and focus groups with 2 way mirrors ever came up with. Well done
Much like Sharper Image’s Ionic Breeze, this is a very expensive bullshit tower, but I am seeing them everywhere lately. Box fans are fucking amazing. Get a box fan.
Of course they have benefits. Depending on the situation of course. I wouldn’t put one in my computer, but I sure as shit have one in my home with a kid running around. Turns out a fan with all the heavy spinning hardware stuff in it’s base is less likely to fall over than one with all that stuff up on top. Honestly all my Dyson stuff work fucking great for their intended purpose.
Paying the absolute minimal amount for something isn’t necessary the goal of life. You’re not a corporation.
Used to have to use one and I just don’t understand the bagless appeal. I like having a bag to contain all this awful dust. Felt like I needed to wash every time I emptied it and they fill up so fast in comparison too.
I got one years ago when they still were a lot cheaper and I must say it’s the best one I ever had. It’s powerful and so quiet that I can leave it running next to my bed when it’s hot.
I have the opposite experience, have ypu tested competition at the same price level? IMO they’re overpriced fragile plastic products with a very good marketing…
I mean now it doesn’t matter anymore when you’re satisfied, but before buying these overpriced fragile plastic stuff, I would at least test it against other fans. And surprise - almost all other fans work better and are cheaper, especially similar priced ones…
And what kind of fan could you get with that money… Pretty sure I could get an industrial one that exchanges most of the air in my house in minutes or even seconds.
It’s also possible to reduce perceived noise with some blade spacing tricks. I remember reading about how Apple designed the MacBook fan blades to seem really quiet under normal load. It was pretty interesting to read. I’m too lazy to find a link, but it should be easy to find with a quick search, if interested.
Its true there is a fan in the base of all bladeless fans, but the fan is smaller then traditional fan designs and moves the same if not more air then traditional fans.
Air is pulled in through the base and forced through a thin slit. This fast stream of air creates an area of low pressure, drawing in and amplifying surrounding air behind the slits.
Because air “sticks” to itself, when you get some air moving (by breathing out, for example), the initial bit of air that you move “drags” some air with it from beside and behind. This is what Dyson calls “air multiplier technology”.
Dyson uses this property of air to claim that they only have to move a fraction of air (with the fan in the base) of all the air that blows past you.
Here is a example of how this works, and how you can use one breath to fill a large bag.
https://www.youtube.com/watch?v=rAAelB7nN14
Here is a image of the multiplier effect, from the original intake of air at the bottom. You can see the air is multiplied from behind and infront of the fan.
Nothing sticks to my breath, especially in the mornings.
And yet despite the fact that they’re using less electricity and a smaller fan somehow the product costs five times as much as a normal fan. How does that work?
Partly because of the overall quality of the fan. Like you can go to Walmart and get a comparable bladeless fan for 49.99 but it’s gonna be louder, won’t be as efficient and won’t last as long.
Speaking of the dyson. IMO one of the worst fans out there: extremely weak (see measurements on YouTube), extremely loud and very fragile… Have one in the office, and I hate it…
A classic fan, fraction of the price performs better in all relevant categories…
Btw. They also create a “bigger” airflow around them so in that regard not better…
Don’t forget the fact that they cost like 400 plus dollars for reasons
I’ve never really understood this multiplayer thing, sounds like a free energy gimmick. You can move more mass at the same speed without putting in more power.
Basically they’re trying to claim that the Bernoulli principle is some amazing concept that only they’ve come up with.
Their fans do work in the sense they do move more air but it creates so much back pressure that most of that air movement is lost. So you might as well not bother.
maybe it works kind of like how water works. Water also sticks to itself, like how separate droplets combine very fast when close enough.
Well in fluid dynamics you don’t really make the distinction between liquid and gas. You can model air as basically just a very low viscosity fluid and it works. No one really knows why it works because it shouldn’t, air doesn’t stick to itself, but if you pretend that it does the simulations still work, even though they’re wrong.
If you look in most physics textbooks even at quite a high level they will tell you that aircraft fly because air sticks to itself, but again, it doesn’t. No one is quite sure why aircraft work, no one’s all that certain where the lift comes from. But physics textbooks hate to admit that so they just pretend that air sticks to itself.
You’re basically trading energy to move higher volume of air. The fan can move smaller amount of air at higher speed, but larger amount at a gentle breeze feels nicer and helps with circulating the air in the room better.
You could achieve it by taking that exact motor and slapping a bigger fan onto it, but that looks less cool and probably produces more noise? Maybe there’s some efficiency differences if the motor is better at spinning fast, but as a spherical cow in vacuum it should be similar.
It’s cheaper to make electric motor spin fast with low torque than slow with high torque, a ceiling fan of the same cfm needs a bigger motor than a standing fan.
I would counter that a small fan spinning at high rpm makes more (annoying) noise than a large fan spinning at a lower rpm.
But due to it being hidden maybe it can be isolated easier?
It’s also just Dyson’s completely overpriced bullshit. It makes weak air flow and has no real benefit for use as a fan.
Project Farm has tested them a couple different times. They’re expensive aesthetic toys.
*Edit: While I’m on a bit of a Dyson rant; I’d just like to also say that I HATE their hand dryers that some places bathrooms use.
Works pretty well on my end
Any similar priced fan likely works better. Especially the fans seem to be garbage IME…
The dyson we use in the office is worse than the other fairly standard fan for a fraction of the price (airflow and loudness…)
still a miss-labeling to call them bladeless fans, just because the blades are hidden. by that logic my beef raviolis are vegetarian (tbf: the catholic church made a similar claim during the medieval ages).
Bernoulli Fan is not only more accurate, it also sounds much cooler.
Pun intended, ofc 🤭
To play devil’s advocate, there are no exposed blades at the point of use. I’d wager people who buy “bladeless” fans are more concerned with aesthetics and avoiding a crying toddler than they are with semantic accuracy. We call Wi-Fi “wireless” even though the router is plugged in.
I can stick my peepee into a bladeless fan and not worry about cuts so there’s that.
well, no, see, you can’t.
you can stick it through it. but you can’t stick it in it.
You can’t tell me what I can and can’t do with my own peepee.
Username checks out
Regular fans dont have exposed blades either, there is a mesh over it.
I take it you’ve never seen a toddler stick their fingers through the mesh
Yes, I saw. The holes are small enough for an adult and far away from the blades for a toddler that it is safe.
My experience differs.
at work we have expensive fans with a cheap metal mesh around them - to avoid a crying co-worker. at home i have a cheap tower fan with a weird plastic mesh - there are no visible blades on it except if i crank my neck into a really uncomfortable position and shine a flashlight into it. which one of the two can i call bladeless?
luckily i already have a devils advocate and @arctanthrope@lemmy.world dropped the name of god. how well do i need to hide my fans blade to create a Ventilationbescheißerle?
Beaver?
beavers are also a funny thing: it swims, therefore it is a fish. fish aren’t animal.
i was more referencing things like @arctanthrope@lemmy.world expanded: hiding meat in dough. funny how many strategies they had to cheat a supposedly all-seeing, all-knowing entity.
Religion is the king of all rules-lawyering.
there’s a type of German meat dumplings called Herrgottsbescheißerle, which literally means “little things that bullshit the Lord” for the same reason
Oh my god that makes so much sense suddenly
Well, Beef comes from cows, and cows only eat vegetation, so beef raviolis are vegetarian. Now, I’m not a Rocket Biologist, but I think the math here is pretty conclusive.
Is this what a rocket biologist specializes in?
The cynic in me thinks “bladeless” makes them easier to sell in fan-death countries.
Carpinchos (capybara) are fish.
You know … Bernoulli Fan - that’s way better idea than a room full of MBAs from expensive business schools and months of market research and focus groups with 2 way mirrors ever came up with. Well done
This is such a rollercoaster to read LMAO
Tesla sounded like a cool name for a car too…
If only wasn’t owned by a Nazi.
And weren’t dangerous/death traps for no good reason. And had good service practices, and weren’t anti-resale.
Mr. Tesla is certainly rolling over in his grave.
A traditional fan also pulls air from around its blades using the same principal. A bladeless is just a gimmick it has no actual benefits.
Here’s a video on the subject:
https://www.youtube.com/watch?v=ySSo5PmZZJM
It turns out, a bladeless fan is even less efficient than a traditional one. It works better, when you remove the casing.
Thank you.
Much like Sharper Image’s Ionic Breeze, this is a very expensive bullshit tower, but I am seeing them everywhere lately. Box fans are fucking amazing. Get a box fan.
I did one better, I got myself a ceiling fan.
Toddler hands don’t go through the protection of a classic fan, if it’s built like after 1965.
Also we were not discussing esthetics but efficiency.
Of course they have benefits. Depending on the situation of course. I wouldn’t put one in my computer, but I sure as shit have one in my home with a kid running around. Turns out a fan with all the heavy spinning hardware stuff in it’s base is less likely to fall over than one with all that stuff up on top. Honestly all my Dyson stuff work fucking great for their intended purpose.
Paying the absolute minimal amount for something isn’t necessary the goal of life. You’re not a corporation.
None of what You said is about efficiency, which is the subject here. Not paying corporations for bullshit is one of my goals in life.
unironically love Lemmy for the explainers you get on a shitpost. Only stumbled on this cause I was looking it up myself. Thanks for the write up :)
Keep in mind, that the explanation is wrong.
Yep, dyson bullshit marketing.
Just like their hoovers then.
Used to have to use one and I just don’t understand the bagless appeal. I like having a bag to contain all this awful dust. Felt like I needed to wash every time I emptied it and they fill up so fast in comparison too.
Smaller fans = more noise
And why isn’t a regular fan getting the “surrounding air” to move too? Is there a subscription for that?
It’s most probably dyson bullshit (the moved extra air is slowing the original air down, or it’s magic) marketing.
Magnets!
The air thing is real physics. It does “work”. It just isn’t very useful in this application.
Yeah don’t understand the hype for dyson, for (almost?) every category they have a product for there’s a higher quality product for a lot less money.
They really seem to have perfected their marketing…
The products are not even high quality, thin fragile plastic everywhere…
I got one years ago when they still were a lot cheaper and I must say it’s the best one I ever had. It’s powerful and so quiet that I can leave it running next to my bed when it’s hot.
I have the opposite experience, have ypu tested competition at the same price level? IMO they’re overpriced fragile plastic products with a very good marketing…
Why would I test others when I already have one I’m completely satisfied with for quite some years now?
I mean now it doesn’t matter anymore when you’re satisfied, but before buying these overpriced fragile plastic stuff, I would at least test it against other fans. And surprise - almost all other fans work better and are cheaper, especially similar priced ones…
You’re right, it doesn’t matter
How much?
What?
HOW MUCH?
(Did you pay)
I don’t really remember, it’s been years. I think it was somewhere between 100-150€.
So 3-5 times a normal one… Kind of not cheap IMO, but if you like it…
And what kind of fan could you get with that money… Pretty sure I could get an industrial one that exchanges most of the air in my house in minutes or even seconds.
I didn’t say it was cheap, I said it was worth the price.
It’s the same reason I use a beef bouillon cube in place of real meat when I feed my vegan friends. It’s much smaller so it doesn’t count.
My god, the sass - it’s magnificent.
Sir, this is a
Wendy’sshitpost community.Fans are usually loud in proportion to their speed. Quiet ceiling fans have a big diameter and many blades. Doesn’t a small fan cause a lot of noise?
Yep, which is why those Dyson fans emit an annoying high-pitched shriek.
Honestly depends on speed, quality of bearings and motor, blade geometry and thickness as well as any possible enclosures.
The biggest source of noise with fans is air cavitation.
It’s also possible to reduce perceived noise with some blade spacing tricks. I remember reading about how Apple designed the MacBook fan blades to seem really quiet under normal load. It was pretty interesting to read. I’m too lazy to find a link, but it should be easy to find with a quick search, if interested.
I just imagined someone turning on a fan and hearing an electric f1 car drive by
i don’t think the point of the post is about being useless or inefficient, but about the misleading name