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DIY pressure drop curve - Page 2

post #11 of 15
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Quote:
Originally Posted by ira-k View Post
HaHa....I used to stay in trouble when I was a kid,only if I couldn't get it put back together right before my Folks found out...


I see what your saying and it might be true...But then again the outlet barb is still under coolant and the suction side should stay close to the same..I don't know, look forward to your trying it....



Coke bottle......Dryadsouls uses a looks to be 3 pound Folgers plastic coffee can for a res...


I used to have a Swifty micro res when they first came out...I don't remember if I had much of a pressure drop with it or not, I was using a 9W DDC then...I don't have one now I gave it away or I would let you try it out...I like to use a bay res, I can throw a thick phone book under the front of my case and be bleed in 5 minutes...A T-Line looks a lot cleaner though..
I just finished collecting the data, it's not nearly the big deal I thought it was. I have to finish processing the data, but from what I can tell it's something like this:

T-line least restrictive - Almost hard to measure
Reservoir about twice as restrictive as a T, but still very small and hard to measure.
3 elbows - Whole different story, plenty to measure there.

So the T and res both are very very small losses, I guess there's not quite the energy loss there I was thinking. Anyhow, after I get it all figured out, I'll post a new thread on it. I should have what I need now to finish off that elbows question too.
    
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post #12 of 15
Sounds good...Yeah I guess it just slows velocity and not flow because the out-let barb is still covered so your still getting the full suction...Thanks for trying it out...
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post #13 of 15
Quote:
Originally Posted by ira-k View Post
Sounds good...Yeah I guess it just slows velocity and not flow because the out-let barb is still covered so your still getting the full suction...Thanks for trying it out...
Velocity at that point in your loop ... which may actually be a good thing. The spikes in temperatures are "mellowed" ( for lack of a better term ) due to the larger volume of water that needs to be acclimated ... but also ( just a thought here ) ... the forced slowing of the water molecules also causes them to lose energy.
At least in part this energy equates to heat ... as those molecules entering the reservoir are forced to make contact with other molecules that are nearly standing still by comparison.

Feasible ?
post #14 of 15
I don't know Joe thats a good thought I need to think that over...If I understand you right your saying that the coolant might give up some of its velocity in the form of heat..HaHa...Thats a good thought.......It would probably take a pretty good thermister to measure it with....Now I'm going to get a head-ache thinking about that.......I wonder if there would be a way to magnify the effect and dissapate the heat with out much flow loss....


The way I think of a good res the pressure drop isn't much because its a closed loop...The out-let barb is going to still have a positive pressure, which you need so it wont cavitate, so the pressure across a bay type res should stay pretty constant...Its just the incoming velocity is slowed a little so the bubbles will release easier but the pressure stays pretty constant....
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post #15 of 15
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I think there is some heat gain through friction within the system, particularly at the pump, this would explain why pumps that even have very separate motors have a fair amount of heat dump...alot of it is actually water friction of the impeller. Energy loss is typically in the form of heat, but I don't know.

Here is a test for you, put a household mixer to work. Fill the mixing bowl 1/4 full of water and let it reach room temperature, now turn that sucker on for 10 minutes and read the temperature again.

Sounds like a good mythbusters question..

Anyhow the reservoir turned out to be fairly free flowing, I have curves now and a beta version plugged into my estimator to calc some system numbers for me.

In a loaded system a T-fitting is worth about 1' of tubing where the reservoir is worth about 2-3' of tubing, and the elbow is worth 4'.
    
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