Computer fan blower(any1 who knows fluid dynamics?)

Toggle sidebar Toggle sidebar
daniyalkh14

daniyalkh14

Honorable
Oct 13, 2017
42
0
10,530
Guys im making a fan blower to clean my system and heatsinks, i'm using 2 120mm computer fans,fans operate at 12v 0.3 amps,i got 12v 1.5 amps adapter and i have designed an enclosure that will force all the air to exit through small hole,but after designing everything ,the air seems to be coming out of fans themselves,like they are sucking and exhausting air from same direction,(i have checked twice the fan is not set to exhaust and there are no leaks in enclosure if you were wondering)i have attached pics so you could see...what i could be doing wrong?
https://www.dropbox.com/s/rve54yd3s3t8h2r/20171013_201110.jpg?dl=0
https://www.dropbox.com/s/9wktkampfbp1sf4/20171013_202136.jpg?dl=0
 
Solution
Ralston18
I very much like the idea of "tinkering" and agree with Math Geek in that respect.

However, simplicity is best.

Just use compressed air from a can as suggested by coozie7. Follow the instructions on the can.

I tend to set up a vacuum cleaner nozzle a foot or so away and let the air flows start moving before blasting the canned air about. Dust gets pulled away without any risk of the vacuum cleaner nozzle damaging things or creating an electrostatic charge.

Also I keep my floor based desktops up on small wheeled dollies (homemade to fit). Just a couple of inches of height goes a long ways towards keeping dust, dirt, bugs, hair, paper scrapes, and other debris out of the desktop case.

In most environments, cleaning should not...
Sort by date Sort by votes
Math Geek

Math Geek

Titan
Ambassador
Oct 15, 2014
18,028
2,337
101,590
i would suspect that you are putting more are into the box than can come out the exhaust holes. it has to come out somewhere so it comes back out the input side.

tinker with increasing the size of the exhaust one way or another and see if that prevents the air from backing up and returning the way it came.
 
Upvote 0 Downvote
PsyKhiqZero

PsyKhiqZero

Splendid
Jun 1, 2008
3,171
0
21,960
it would prolly help if the end tapered down the tip. But fans are rated for both the amount of air the push and the static pressure they can withstand. My guess is that the computer fans won't be able to handle the back pressure created by your box. It's prolly why you don't see those style fans in compressors.
 
Upvote 0 Downvote
lumineZ

lumineZ

Honorable
Jul 25, 2017
1,803
21
13,165
That will not work...

You need a more powerfull high RPM + very high static pressure fan that overall goes into a tube formed like a tube.

Take a look at a leaf blower as an example.

And with the idè of blowing a heatsink clean etc, you cant make it like you have in the picture... the overall air volum you need to force into the box will just blow it apart.
 
Upvote 0 Downvote
daniyalkh14

daniyalkh14

Honorable
Oct 13, 2017
42
0
10,530
damnit guess DIY on youtube weren't that helpful...so what would you guys recommend how can i make this a little practical if not completely?what changes do you guys recommend.....it will be a fun experiment to try
 
Upvote 0 Downvote
Math Geek

Math Geek

Titan
Ambassador
Oct 15, 2014
18,028
2,337
101,590
tinkering is fun for sure. what exactly is the goal of this device? are you trying to make something to blow out the case every now and then? or something you can install inside the case and keep a directed flow somewhere?

not really sure what you're trying to accomplish so not sure how to proceed.
 
Upvote 0 Downvote
daniyalkh14

daniyalkh14

Honorable
Oct 13, 2017
42
0
10,530

i'm just trying to make a blower to clean my pc and blow dust out of components that cant be cleaned easily like cpu and graphics card heatsink

 
Upvote 0 Downvote
Ralston18

Ralston18

Titan
Moderator
Oct 11, 2014
34,894
3,324
146,290
I very much like the idea of "tinkering" and agree with Math Geek in that respect.

However, simplicity is best.

Just use compressed air from a can as suggested by coozie7. Follow the instructions on the can.

I tend to set up a vacuum cleaner nozzle a foot or so away and let the air flows start moving before blasting the canned air about. Dust gets pulled away without any risk of the vacuum cleaner nozzle damaging things or creating an electrostatic charge.

Also I keep my floor based desktops up on small wheeled dollies (homemade to fit). Just a couple of inches of height goes a long ways towards keeping dust, dirt, bugs, hair, paper scrapes, and other debris out of the desktop case.

In most environments, cleaning should not be needed all that often. Check and clean if and when necessary.

Also ensures that you do not create some detrimental air flow condition that ultimately results in overheating and a system "meltdown".

 
Upvote 0 Downvote
Solution
PsyKhiqZero

PsyKhiqZero

Splendid
Jun 1, 2008
3,171
0
21,960
The problem with your project is finding a "cheap" fan that can handle the back pressure. I don't really know exactly how much static pressure a fan would have to handle in order to do what you need.

For comparision sake the corsair "SP" series is rated at 3.1mm/H20, the strongest fan I can think can do 36mm/H20. But your looking at 2.16 watts vs 36 watts. nearly 16 times more power for 10 times the performance. Air compressors typically store in a chamber, probably because it would be to hard to create the airflow in "real" time. But if your intent on building your own i would research their designs.

For reference sake this is the fastest PC fan I can think of. Linus Tech tips does a video of this fan.
https://www.amazon.com/HIGHFINE-4000RPM-Cooling-FFC1212DE-Computer/dp/B01LLYQ2VE/ref=pd_sim_147_1?_encoding=UTF8&pd_rd_i=B01LLYQ2VE&pd_rd_r=GMDFBFQW3ET43AGZW0N7&pd_rd_w=xgs5u&pd_rd_wg=iB0Uc&psc=1&refRID=GMDFBFQW3ET43AGZW0N7

https://www.youtube.com/watch?v=nAFB9w2Rh0Y

Edit: Linus fan's is actually stronger. Link provided.
https://www.amazon.com/Delta-PFR0912XHE-SP00-Bearing-92x92x38mm-Cooling/dp/B015EOKGKU/ref=sr_1_1?ie=UTF8&qid=1508115912&sr=8-1&keywords=delta+pfr0912xhe
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom