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curious why no air in loop

post #1 of 13
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So yes i know how to properly take the air bubbles out of my loop. However, i do not understand why not keep them in? Having a little waterfall in my reservoir looks cool.
-does the air corrode the metal?
-reduce cooling potential? (i assume it does but a few bubbles will only increase temps marginally at best)
i prefer a concrete answer not just a guess
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post #2 of 13

Air in your loop does several things:

1. It can interrupt the water flow which will reduce the flow rate. Basically air can get trapped in the top of a component and reduce the channel available for the water flow.

2. It reduces the heat transfer rate. Air has a much lower heat capacity than water, so having air in contact with a heat transfer surface (part of the block or rad) will effectively insulate that surface from the water, greatly reducing it's ability to cool the system.

3. It makes noise. Air moving round in your loop makes a gurgling noise. You might enjoy sitting next to that, I prefer not to.


If the small bubbles stayed as small bubbles then there would not be a problem. Unfortunately they have a habit of collecting in parts of your loop, like the tops of rads etc, which can cause problems.

If you really want a waterfall effect in your res then there are some that provide it; Cyberdruid does some waterfall reservoirs, and there is always the EK Spin res:


Edited by GingerJohn - 10/23/11 at 1:00pm
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post #3 of 13
For one yes having the air and water can corrode the metal also the pumps don't handle air bubbles well as they are usually a rotory pump and not a positive pressure reciprocating pump. And lastly they do slightly reduce cooling ability as the thermal capacity of water is around 4.1 j/gram C and the heat capacity of air is About 1.01 J/gram C.
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post #4 of 13
As said above air is bad. air causes the metal in that area to corrode faster because it is drying out that area.

Air is harder to cool than water so more air means less cooling ability.
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post #5 of 13
rust = FeO(2)

salt just speeds the process up, thats why iron corrodes faster in salt water.

and air has a lower heat transfer rate etc. see above
post #6 of 13
Thread Starter 
Quote:
Originally Posted by Arthedes View Post
rust = FeO(2)

salt just speeds the process up, thats why iron corrodes faster in salt water.

and air has a lower heat transfer rate etc. see above
Yes i understand this that is why nothing is made of of Iron... also makes sense that heat transfers at a slower rate with air vs water but if the all of my air is located inside of my reservoir like the image it doesn't matter because all the heat transfer is located at the water blocks and rad... and yes the heat transfer would change where air contacts water but that is such an insignificant amount that it doesn't matter.

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post #7 of 13
Well having air in your res like that is fine. Most people run their res ~3/4 full. So long as the inlet and outlets are submerged you can have it as full or as empty as you want.

It is air in the rest of the loop that is a problem. Bubbles running though the loop are an issue as they like to collect in places. So long as you pump isn't sucking any air into your loop you will be fine with waterfalls in the res.

Edit:

Quote:
Originally Posted by Arthedes View Post
rust = FeO(2)

salt just speeds the process up, thats why iron corrodes faster in salt water.
Except for the fact that we don't run iron in the loop, yes. We will get Cu + 1/2O(2) = CuO or 2Cu + 1/2O(2) = Cu(2)O.

Having air in the loop is a bit of a non-issue in this case, there is dissolved oxygen in the water which will allow corrosion to take place. Having air there will speed things up a bit but corrosion (well, oxidation) will happen regardless. Most blocks are coated with a thin film of resin to prevent corrosion, once this has been worn away your copper will oxidize. For the most part it will not noticeably affect temperatures, however large buildups of cupric oxide (CuO) have been known to block micro channels in some blocks.
Edited by GingerJohn - 10/23/11 at 1:49pm
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post #8 of 13
If there are bubbles floating in the res, there are bubbles in the rest of the system and, more importantly, there are air-pockets elsewhere in the system. As soon as air gets into the loop it will get trapped in places, places that you can't see, like in your radiator.
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APU what?
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by GingerJohn View Post
Well having air in your res like that is fine. Most people run their res ~3/4 full. So long as the inlet and outlets are submerged you can have it as full or as empty as you want.

It is air in the rest of the loop that is a problem. Bubbles running though the loop are an issue as they like to collect in places. So long as you pump isn't sucking any air into your loop you will be fine with waterfalls in the res.
awesome in that case ill be refilling my reservoir later and post some images/vids of how it looks
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post #10 of 13
Cavitation is bad in most engineering contexts:

http://en.wikipedia.org/wiki/Cavitation
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