pump in series but not sequential

[silverphoenix]

pretty much every series setup I've seen the pumps feed right into each other, but I'm wondering does it make a difference if the pumps are in different parts of the loop.

Like

Pump1>CPU>Pump2>Rad>GPU>

[Sadasius]

Yes it does. I especially noticed when I was bleeding the system because I was activating one pump then the other. The bubbles raced around and when I activated the second pump the bubbles were getting sucked down to the bottom of the res and I have the 250 EK rev 2 res. Pic or it didn't happen! I should empty it and redo it and take a video to show that yes there is a difference. I don't know why it does actually because wouldn't the pumps be always at the same speed and the flow stay the same as well? I am thinking that one pump helps to relieve the load on the first one and makes everything travel faster.

[Vapor]

pretty much every series setup I've seen the pumps feed right into each other, but I'm wondering does it make a difference if the pumps are in different parts of the loop.

Like

Pump1>CPU>Pump2>Rad>GPU>

It makes no difference in terms of flowrate in a closed loop.

[silverphoenix]

It makes no difference in terms of flowrate in a closed loop.

swt!!

also
Sad I'm not gonna have that kind of res setup, once I bleed with one pump there should be no problem with bubbles getting sucked down.

[Vapor]

I have a multi-pump setup....I only bleed with all 3 of them on, otherwise bubbles 'hide' in the other pumps. Takes awhile though since the flowrate is damn high

[Sadasius]

also
Sad I'm not gonna have that kind of res setup, once I bleed with one pump there should be no problem with bubbles getting sucked down.

Well that's what I ended up doing was bleeding with one pump and then when the bubbles were gone by the next morning I turn both of them on and left it that way. Just put more additions to this today like more ram and a few other goodies. It just never ends does it?!?

[eth0s]

You could just wait and eventually all of the air bubbles will bleed out of the system. It will just take longer than with a single pump loop. Your flow rate has increased dramatically and it is sucking all the bubbles around the loop with it. But they are still air bubbles and will still float to the top of the res eventually. You might want to lightly tap your radiators with a screwdriver (and the res when you see bubbles whizzing past) to help get any trapped bubbles out of there. Or you can use your one pump at a time strategy, which to me seems like unnecessary extra work on your part though. Just make sure that you always have a tube full of water feeding the pump that is running.

[MpG]

I was always under the impression that two pumps immediately in series with each other, especially if they're practically touching, would potentially suffer from cavitation issues. With my own dual-DDC setup, I deliberately put a radiator between the two pumps, just to be on the safe side.