Your Universal Remote Control Center
RemoteCentral.com
Custom Installers' Lounge Forum - View Post
Previous section Next section Previous page Next page Up level
Up level
The following page was printed from RemoteCentral.com:

Login:
Pass:
 
 

Page 1 of 2
Topic:
OT. Todays imponderable
This thread has 28 replies. Displaying posts 1 through 15.
Post 1 made on Tuesday July 3, 2018 at 05:53
thecapnredfish
Senior Member
Joined:
Posts:
February 2008
1,397
Always fun to read what you guys have to say.

Ceiling fan set to medium and dust collects on blades. Turn fan on high and dust is scattered in chunks throughout the room like snow. If you were to clean it and then leave on high. Dust again builds but does not shed off the blades.
Post 2 made on Tuesday July 3, 2018 at 06:27
King of typos
Loyal Member
Joined:
Posts:
June 2002
5,275
Because that dust is high as f... and clings to the blades because they have the munchies. And fan blades are their comfort food.

KOT
Post 3 made on Tuesday July 3, 2018 at 06:55
3PedalMINI
Loyal Member
Joined:
Posts:
July 2009
7,860
Hmmm......that’s deep man!
The Bitterness of Poor Quality is Remembered Long after the Sweetness of Price is Forgotten! - Benjamin Franklin
Post 4 made on Tuesday July 3, 2018 at 07:01
buzz
Super Member
Joined:
Posts:
May 2003
4,366
Is this a kitchen? Grease will glue dust to the blade.

It's a balance of forces: centripetal-air flow-grease bonding-static charge attraction. I expect the dust layer will be thicker near the root of the blades.

If you could find a '+' speed that is faster than "high," chunks would again fly off. Steady state speed will determine the amount of dust adhesion.
Post 5 made on Tuesday July 3, 2018 at 07:38
Brad Humphrey
Super Member
Joined:
Posts:
February 2004
2,586
Sounds like someone desperately needs an air purifier.
Or to use a better filter on the HVAC and learn how to use the 'fan' mode.
Or, if this only happens once a year. Learn how to do Spring & Fall cleaning in the home.
Post 6 made on Tuesday July 3, 2018 at 07:50
Mac Burks (39)
Elite Member
Joined:
Posts:
May 2007
17,515
The dust becomes more densely packed (vs on medium) when kept on high. It would fall off if you could increase speed above high.
Avid Stamp Collector - I really love 39 Cent Stamps
Post 7 made on Tuesday July 3, 2018 at 09:37
highfigh
Loyal Member
Joined:
Posts:
September 2004
8,311
The dust clings to itself once a thin layer has been established, using humidity or something else as the bond. As it builds, its ability to remain depends on the speed of the fan and when the ability to bond to the substrate has been exceeded, it flies off in clumps. It's kind of like when someone isn't paying attention (or passes out) when smoking a cigarette and they have 2" of ash at the end. It will eventually fall off, but some will stay on the cigarette.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 8 made on Tuesday July 3, 2018 at 10:59
Lowhz
Senior Member
Joined:
Posts:
April 2012
1,168
The dust has a negative charge. The faster you spin the blades of the fan the more electrons are shed through aerodynamic forces and increases the positive charge of the surface. Attracts more dust with more cling.


[Link: ieeexplore.ieee.org]
Post 9 made on Tuesday July 3, 2018 at 11:03
Audiophiliac
Super Member
Joined:
Posts:
August 2006
3,309
On July 3, 2018 at 07:38, Brad Humphrey said...
Sounds like someone desperately needs an air purifier.
Or to use a better filter on the HVAC and learn how to use the 'fan' mode.
Or, if this only happens once a year. Learn how to do Spring & Fall cleaning in the home.

Sounds to me like the fan IS the air purifier. As long as it is kept on high to decrease the likelihood of flying chunks of dust snow. :D
"When I eat, it is the food that is scared." - Ron Swanson
Post 10 made on Tuesday July 3, 2018 at 11:45
Trunk-Slammer -Supreme
Loyal Member
Joined:
Posts:
November 2003
7,454
Dust is dying bugs that can no longer hold on at high speed.
Post 11 made on Tuesday July 3, 2018 at 13:08
Ernie Gilman
Yes, That Ernie!
Joined:
Posts:
December 2001
30,104
The way I heard it, there's a small area (volume, really) of gradients of air speed near a fan blade.

The molecules of air touching the fan blade are moving at the speed of the fan blade. When there's dust in the air and it is not moving with respect to a surface, it can "fall" and collect on the surface. We normally think of this as dust falling to the surface, but with a fan blade this effect is increased by the slight amount of static charge mentioned.

A bit further from the blade, there is a difference of speed between the air and the blade, and dust will not collect by "falling," but by static electrical force and by getting caught on the dust already on the blade.

It makes total sense that a higher fan blade speed will fling dust off, since the air speeds at all locations will be higher. The previously balanced system of air and blade velocities will be upset, and centrifugal force (or lack of centripetal force, if you prefer) of the dust particles and clumps will overcome the adhesion to the blade.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
OP | Post 12 made on Tuesday July 3, 2018 at 13:18
thecapnredfish
Senior Member
Joined:
Posts:
February 2008
1,397
See. Was that not more fun than HDMI?
Post 13 made on Tuesday July 3, 2018 at 13:52
Ernie Gilman
Yes, That Ernie!
Joined:
Posts:
December 2001
30,104
Absolutely. There are so many wonderful things to know about in this world. And there's HDMI.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
OP | Post 14 made on Tuesday July 3, 2018 at 14:21
thecapnredfish
Senior Member
Joined:
Posts:
February 2008
1,397
Could be that the fan also slows as dust builds. Preventing blow off. Turning up the juice gets things back in sync.
All of you must remember my question as to why Subway build sandwiches upside down. More great discussions coming
Post 15 made on Tuesday July 3, 2018 at 16:21
Ernie Gilman
Yes, That Ernie!
Joined:
Posts:
December 2001
30,104
It's hard to remember questions about Subway thrown into a discussion of automakers, copyright, DIY bla bla bla from three and a half years ago. Please, let's have at least one great topic like these every month!

As for me, I'll eat subway stuff. I tell them how to do it and they do it. Before they put anything on the bread I have them put some sauce on both pieces of bread. This stops 'em cold since the sauces aren't in that area of their food layout, but they do it.

If you buy a large and you eat from one end, there's nothing to hold the last inch of the first half of the sandwich in the wrapper. So when you're driving and eating, that bit of sandwich falls apart all over the place. To solve this, I tell them not to cut it in half. They're on automatic so hard that you have to watch them carefully.



BONUS:
From the thread where thecapnbluefin brought up Subway:

On April 29, 2015 at 19:28, Mr. Stanley said...
I've only eaten there once. Last summer I ordered a Philly steak sandwich... I was walking down the street, took a big assed bite (I was hungry), and literally almost puked. The meat tasted totally rancid / spoiled. Every time I think about it, I can still almost taste that sour sickly taste. Never again. It was gross.

On April 29, 2015 at 19:29, Fins said...
Those were your words you were tasting
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Page 1 of 2


Jump to


Protected Feature Before you can reply to a message...
You must first register for a Remote Central user account - it's fast and free! Or, if you already have an account, please login now.

Please read the following: Unsolicited commercial advertisements are absolutely not permitted on this forum. Other private buy & sell messages should be posted to our Marketplace. For information on how to advertise your service or product click here. Remote Central reserves the right to remove or modify any post that is deemed inappropriate.

Hosting Services by ipHouse