My List of Dumb Why's...

[kinghong1970]

excuse me if these questions are dumb... but it's been bugging me and i've got to ask...

1) If propellers are designed to move a lot of water... why dont we see pumps with "propellers" instead of impellers?

2) Screw Drive drills also seem to move a lot of stuff out a hole... will this help in creating a pump with more head pressure?

3) Why dont we use "air diffuser" or "handler" that can be used to increase air speed when it comes in contact with a radiator...

4) Why ask Why...

it's tuesday... it's muggy... and i cant take this any more...

:D

[Shlomo]

Impellers are more capable of speeding up water due to centrifugal force, propellers just move water across. It'll be pretty difficult to make a propeller design pump anyways, difficult as in really hard to make, and it'd be worse.

I'm not sure what you mean by number 2, but screws can't move much very fast, or well. So yeah... ever wonder why the Davinci screw plane never worked?

Number 3, no clue what you're talking about.

[gxavier]

Impellers are used in jet boats, and are much much much faster than simple props or trolly motors.

Your questions are easily answered through wikipedia or teh googlez.

[NaeKuh]

screw drive i think has to do with vortex.

Its like try emptying a bottle of water, but give it a good spin and see what the difference is.

3. You obviously didnt factor in closed loop. Having a difuser, would introduce air into your closed loop.
And having air introduced is not something that makes people happy.
Also the same reason as bleeding your radiator. You dont want air stuck in your rad.

If your mean using EVAP. Then we do use those, its called a BONG cooler.
Only theres different rules associated with such a setup.
But it will dip slightly into sub ambient if you pull it off right.

If this isnt what you mean, i have no idea what your talking about. Are you trying to increase static pressure though the fins?

4. I guess your bored like everyone else. Theres always this:
http://i125.photobucket.com/albums/p73/aigomorla/bartgoogle7ai.gif

[BlueAqua]

Screw drive pumps are often positive displacement pumps. They have very high pressure output but very low flow. A centrifugal impeller has high flow with lower head pressure, which is ideal for our small water cooling setups.

I think that one could make some sort of jet pump that would increase the velocity of the fluid through a waterblock and possibly have one that slows it down through the radiator. I think the benefits of this are very few over the disadvantages(cost) though.

The use of a propeller in a pump is a lot more inefficient than an impeller design. With small inductance motors these small water cooling pumps can be quite effective at a low cost.

[DRT-Maverick]

Like said before, props are good for high immediate pressure and lower flowrates, hence the reason boats and jetskis use props (and internally closed props) over centrifugal propulsion. Props are really good for open water and such when superspeed isn't necessary.

[mrmaigo]

Impellers only work in a housing, propellers don't. having a housing means you can safely spin the impeller at much much higher rpm

Like BlueAqua said, screw drives give huge amounts of pressure and constant flow but have extra mass and need a bigger motor. We use them mostly to put holes in the ground or move stuff UP :up:

"air diffuser" and "handler", aren't they the same thing as a shroud? :shrug:

...Try Bud Dry

[kinghong1970]

screw drive i think has to do with vortex.

Its like try emptying a bottle of water, but give it a good spin and see what the difference is.

3. You obviously didnt factor in closed loop. Having a difuser, would introduce air into your closed loop.
And having air introduced is not something that makes people happy.
Also the same reason as bleeding your radiator. You dont want air stuck in your rad.

If your mean using EVAP. Then we do use those, its called a BONG cooler.
Only theres different rules associated with such a setup.
But it will dip slightly into sub ambient if you pull it off right.

If this isnt what you mean, i have no idea what your talking about. Are you trying to increase static pressure though the fins?

4. I guess your bored like everyone else. Theres always this:
http://i125.photobucket.com/albums/p73/aigomorla/bartgoogle7ai.gif

well, the nozzles improve the performance of D-Teks and the EK Supreme block seems to have plates that basically speeds things up in there, no?

well, what do i know... i go to fashion shows and make clothes for God's sake... :D

but Aigo/Naekuh, yea, i meant to try to increase static pressure of air on the fins... guess the fans used for WC'ing is not the right kind?

Screw drive pumps are often positive displacement pumps. They have very high pressure output but very low flow. A centrifugal impeller has high flow with lower head pressure, which is ideal for our small water cooling setups.

I think that one could make some sort of jet pump that would increase the velocity of the fluid through a waterblock and possibly have one that slows it down through the radiator. I think the benefits of this are very few over the disadvantages(cost) though.

The use of a propeller in a pump is a lot more inefficient than an impeller design. With small inductance motors these small water cooling pumps can be quite effective at a low cost.

thank you very much for taking time to reply my list of Stupid Why's...
it was quite informative...

and yes.. i will use Google next time... :D

[kinghong1970]

...Try Bud Dry

yea, before tha fools sell out to a european company...

[Jimmer411]

Impeller design because it can handle the load from spinning at high high speeds as opposed to a propeller

[NaeKuh]

but Aigo/Naekuh, yea, i meant to try to increase static pressure of air on the fins... guess the fans used for WC'ing is not the right kind?




hehe... dont take my bart too personally.

I just like poping him out from time to time. :rofl:

[[XC] Kayin]

Still believe there is no dumb question except the one unasked.

[biggles1]

Kayin;3089050']Still believe there is no dumb question except the one unasked.

Very OT, but have you ever worked within IT-support? I had the same experience as you before being in charge of a support line ;)

[septim]

which question is the dumb one left unasked...

air diffuser = crank up that rheobus...

propellers shoot water straight, impeller shoots water to the sides and with proper houseing/volute? would produce stronger pressure...

its Wednesday evening, why is my day like this... yeah more why questions, Liquid Cooling related or make it liquid cooling related, to keep this discussion going... theoretical and practical applications without all those equations would be nice.

[NaeKuh]

its Wednesday evening, why is my day like this... yeah more why questions, Liquid Cooling related or make it liquid cooling related, to keep this discussion going... theoretical and practical applications without all those equations would be nice.

bah better then me.

Im waiting on a client.

he said 30 min. its been 2 hours. :rofl:

he's getting billed for my time too, and im not cheap.