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MCP35X problem - Page 2

post #11 of 22
I think your pump is still pumping, but the flow is lower than your flowmeter can read.
Just as Martin said, If your flow stopped you temp would rise quickly. Temps?
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post #12 of 22
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post
If you have rpm, you likely still have flow and it's just lower than your flow meter can read.
If flow stopped completely, your temps will jump very quickly. If you still have flow you will only see a few degree rise in temperature.

What are your temps doing?

You really can't stop flow in a closed loop with a weak pump unless there was something like a valve to stop it, or if you were just filling it. When filling it you do have to overcome static pressure/lift, but once filled that goes away due to the return.

I think you still have flow, it's just very slow.
Didn't notice the temp. I just paid all my attention to the flow..

I'm pretty sure the flow stopped completely and the water didn't move at all since I can see the tiny bubble (didn't go further along with the flow) on the tubing.

My flow meter is this. It has both physical and digital sensors,so……from there,I do believe the flow stopped completely because the red impeller didn't spin at all.







post #13 of 22
Thread Starter 
Can someone please explain this statement for me?

"When filling it you do have to overcome static pressure/lift, but once filled that goes away due to the return."

Why? if the vertical distance / altitude between the res/block(at top) and pump(at bottom) is let's say 4 meters, how can a weak pump push those water to that height?
post #14 of 22
Basically, before you fill the loop the water has to push against gravity as you fill the loop. Once the loop has been filled, the water on the downward slope going back to your reservoir creates a suction that pulls the water behind it through. After the loop is filled the pump has to push the water the height difference between the inlet of the reservoir and it's waterline. As this difference is usually pretty small it does not pose a huge problem.
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post #15 of 22
Quote:
Originally Posted by homer29 View Post
Can someone please explain this statement for me?

"When filling it you do have to overcome static pressure/lift, but once filled that goes away due to the return."

Why? if the vertical distance / altitude between the res/block(at top) and pump(at bottom) is let's say 4 meters, how can a weak pump push those water to that height?
Because in a closed loop system, the gravitational force assisting the return to the pump cancels out the gravitational force working against the pump lifting the water.
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post #16 of 22
Thread Starter 
Quote:
Originally Posted by charliehorse55 View Post
Basically, before you fill the loop the water has to push against gravity as you fill the loop. Once the loop has been filled, the water on the downward slope going back to your reservoir creates a suction that pulls the water behind it through. After the loop is filled the pump has to push the water the height difference between the inlet of the reservoir and it's waterline. As this difference is usually pretty small it does not pose a huge problem.
+rep
hope i can add 2 rep

i'll check the flow out tonight again to see if it is really really completely stopped
post #17 of 22
Thread Starter 
Quote:
Originally Posted by Caleal View Post
Because in a closed loop system, the gravitational force assisting the return to the pump cancels out the gravitational force working against the pump lifting the water.
+ rep

does it mean even a D5 at 1st gear can work in a 2CPU+4GPU+MB+RAM+4Rad+10ninety°fittings loop?
post #18 of 22
Yeah, it's the return line.

The pump isn't moving the water any where other than to itself, so the net lift is zero. The pressure head it has to work against lifting up the loop is actually done completely by the weight of the return loop.

In a close loop you you can completely disregard static pressures, this leaves friction as the only head loss.

Bong coolers or other "Free Fall" type systems would be a bit different since there is a break in sealed pressure where it falls, but otherwise and for 99% of watercooling, the pump isn't doing any work in terms of moving the water in lift or suction...it's zero once filled.

That's not to say, any pump will work optimally. You can have problems with air pockets getting stuck and block do have some performance gains with higher flow rates. I just don't think it's really possible to get zero flow if the impeller is turning 1000RPM and the system is bled out/filled already.
    
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post #19 of 22
Thread Starter 
Quote:
Originally Posted by charliehorse55 View Post
Centrifugal pumps do not require water flow to operate, even if the pump had both it's inlet and outlet sealed it could continue to spin.
thanks. I disconnected the Koolance Quick Disconnect Fittings in my loop while my 2 mcp35x pumps both ran at max speed.
nothing happened!
still showed 4587rpm in BIOS!!!
post #20 of 22
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post
Yeah, it's the return line.

The pump isn't moving the water any where other than to itself, so the net lift is zero. The pressure head it has to work against lifting up the loop is actually done completely by the weight of the return loop.

In a close loop you you can completely disregard static pressures, this leaves friction as the only head loss.

Bong coolers or other "Free Fall" type systems would be a bit different since there is a break in sealed pressure where it falls, but otherwise and for 99% of watercooling, the pump isn't doing any work in terms of moving the water in lift or suction...it's zero once filled.

That's not to say, any pump will work optimally. You can have problems with air pockets getting stuck and block do have some performance gains with higher flow rates. I just don't think it's really possible to get zero flow if the impeller is turning 1000RPM and the system is bled out/filled already.
+rep for your further interpretation

as what i said on #12, the red impeller(should I call that an "impeller"? maybe "blade" is better) in the flow meter did not spin at all.
does it mean the flow is zero?
Edited by homer29 - 5/7/11 at 10:34am
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