Eductors any body using them?

[FLUKE411]

Hi all just came across these on glass-holes.com any opinions on them?
Do they take up alot of space? Do they really work?:scratchch

 

[albano]

Hi all just came across these on glass-holes.com any opinions on them?
Do they take up alot of space? Do they really work?

I have used them, and will be using them on my new tank...what you see is what you get as far as amount of space required ( maybe 6-7")...and they do work, but I doubt that those smaller units will increase flow by 4X




.

 

[Chraddam]

glass-holes.com

i lol'd...

 

[FLUKE411]

Thanks for the response Albano. I've been reading your tank build impressive to say the least.

 

[schprock]

The eductors does not increase flow per say. The device works by entrainment of flow. Mass flow is constant because you are still using the same pump so the energy output is constant. Mass flow is a product of fluid density, velocity, and cross sectional area. So basically, the eductor increase the area at the expense of velocity - get a broad flow that is slower. The advertising is a bit misleading in claiming that you can increase the flow 4x. Nothing is for free, least of all energy.

 

[albano]

The device works by entrainment of flow. Mass flow is constant because you are still using the same pump so the energy output is constant. Mass flow is a product of fluid density, velocity, and cross sectional area. So basically, the eductor increase the area at the expense of velocity - get a broad flow that is slower.

YEAH...what he said

 

[NYreefNoob]

those dont work the same as these http://www.1877eductors.com/tank.htm
these actually pull water around them in and out as the water flows through, and yes it greatly improves the pressure of water coming out, but are best used with a pressure rated pump

 

[Killerdrgn]

Yeah I use a penductor on my tank and it seriously increases the flow/ speed of the water coming out of the pump.

 

[Keith P]

24" ??!! Wow!

 

[cali_reef]

Eductors\Penductors uses pressure and speed to increase flow volume. They do not "accelerate" water nor increase water pressure, water flow is increased at the exit point. It's a venturi effect.

They are useful when a right pump is attached to them. with the wrong pump, you are just wasting flow and energy.

 

[Keith P]

So it's safe to assume they add head pressure?

 

[cali_reef]

So it's safe to assume they add head pressure?

Ultimate head pressure killer. Would not mix one of these with normal unrestricted port\nozzle in the same plumbing.

 

[QUESTIONMARC]

lol.. as negative as this guy is most the time.. this is the correct "engineering" answer.. and yes.. they work.

Eductors\Penductors uses pressure and speed to increase flow volume. They do not "accelerate" water nor increase water pressure, water flow is increased at the exit point. It's a venturi effect.

They are useful when a right pump is attached to them. with the wrong pump, you are just wasting flow and energy.