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DIY pressure drop curve

post #1 of 15
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New rules do not allow 3rd Party Sponsored Testing or Reviews.
Edited by Martinm210 - 12/8/12 at 6:52pm
    
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post #2 of 15
Another great DIY test method, we're gonna have to start calling you Doc Martin.
  
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post #3 of 15
Thread Starter 
New rules do not allow 3rd Party Sponsored Testing or Reviews.
Edited by Martinm210 - 12/8/12 at 6:52pm
    
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post #4 of 15
Another great bit of backyard ingenuity !

Doc Martin it is !


Uber reps !
post #5 of 15
This is amazing! Doc martin!
post #6 of 15
I'm glad to see others giving good, easy-to-follow guides.

Nice job!
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post #7 of 15
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Thanks...next on my list is to take a closer look at elbows, T-fittings, and resrevoirs. I think I have a suprise about reservoirs, but it's just a hunch at this point. Hope to get some good fitting and reservoir data to plug into the estimator.
    
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post #8 of 15
Man you like number crunching....Nice guide....I used to think that a res would hurt flow a little but the more I've read it seems that it only effects the velocity...Thats one reason a res bleeds faster, when it hits the res and slows velocity the air bubbles will rise to the top....
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post #9 of 15
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Quote:
Originally Posted by ira-k View Post
Man you like number crunching....Nice guide....I used to think that a res would hurt flow a little but the more I've read it seems that it only effects the velocity...Thats one reason a res bleeds faster, when it hits the res and slows velocity the air bubbles will rise to the top....

Yeah, I like numbers, always curious how things work. I always laugh when I find myself taking apart something brand new and come to realise I'm having more fun with the pieces than whatever it was as a whole.

Yeah the slower water definately help with the air bleeding, and I think reservoirs work better for bleeding because you force the entire stream to enter that slow state. A T line just captures the bubble flowing through the tubing that are rubbing along the very top and the very small amount of flow in the T line that's created by the bubbles themselves traveling up the column.

My hunch goes along the lines of thinking of pressure drop in terms of energy loss and this includes velocity(takes energy to change velocity). If water is moving along a section of tubing at a constant velocity the only loss is the rubbing along the sidewalls and the frictiong between the fluid itself when in this turbulent state. In an elbow it has to accelerate slightly for the smaller ID, then take an abrupt change in direction which also is a form of acceleration. In a reservoir if it's big enough that water almost comes to a complete stop when it hits the pool of water, then on most reservoirs it has to find it's way back into a sharp prodruding outlet and accelerate back up to speed again when it enters the tubing. That seem like an aweful lot of energy getting used up and if it is..it should relate to a significant pressure drop. I do think there is a difference in reservoir types, the bay reservois have the threading such that the barb is not protruding into the reservoir much, also they are not a big pool of water so so the coolant doesn't slow down as much. I would think something like the EK or microreservoirs are most restrictive.

I gave Apollo my bay res, so all I have to test now is a home made simulation...I made a coke bottle res..
    
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post #10 of 15
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..
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