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Hydrophilic coating for cooling block degassing

Hydrophilic coating for cooling block degassing

(OP)
Hello good people,

we have a simple cooling block (somewhat like the ones you use for cpu water cooling) but unfortunately when I pump water through it the air bubbles get trapped in corners and below the lid. I am wondering if hydrophilic coating from inside would help. Naturally I tried rising the flow but it didn't help much, I cannot move the block around each time. I need a solution (or better design) which would ensure that any bubble that enters the instalation will neot get trapped inside a cooling block.
What do you think about this hydrophilic coating idea though?

RE: Hydrophilic coating for cooling block degassing

No, a coating will not help. You need to create smaller flow channels inside the block so the fluid velocity is high enough everywhere to sweep the bubbles along with the fluid. This will also improve heat transfer.

RE: Hydrophilic coating for cooling block degassing

You also need to gas the fluid. When I fill the closed cooling loop on a computer system I first heat the water to near boiling, and then apply a slight vacuum to it. The after it cools some I fill the system by suction.
If you can't do that hen try adding a very little bit of a surfactant, this will make the bubbles less stable.

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P.E. Metallurgy, Plymouth Tube

RE: Hydrophilic coating for cooling block degassing

Ed is suggesting exactly what I would suggest. Eliminate the dissolved gas and you eliminate the problem.

RE: Hydrophilic coating for cooling block degassing

You can try a drop or 2 of low foaming dishwashing detergent, per Ed's suggestion of a surfactant.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

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