90degrees best for jet impingement?
http://cpdl.kettering.edu/jiht.html
I found this article and they found that say that about 70degrees make the best angle. What I think it is, is that the windshield is angled 20degrees so that when at 70degree jet a 90degree angle is formed, but I am not sure because there isn' that much interpretation of the graph. |
More importantly, how does this relate to watercooling a PC?!? More specifically, what relation do you see with that information?:shrug:
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I see the relationship. If you angle the barb/jet at 70 degs to the baseplate, you can (by his data) get better results. This only works, though, in cases with one inlet and one outlet. In cases where there are two opposing outlets like WW (or my project for that matter) this wouldn't work. It also wouldn't be optimized for using ridges or fins like WW, and would only work on pin style configurations.
This makes absolute sense as it would allow the old coolant to be cleared from "ground zero" more effectively than direct 90 deg impingement. How to utilize it effectively is another matter altogether. |
Yeah but look at the Reynolds rating of the tested flows: 5'000, 10'000 and 20'000: our pumps don't do that, unless that's a turbulence rating at the surface of the windshield?!?
[edit] For those interested, here's the very relevant, accompanying text (PDF, 15 pages). [edit2]...and the 4 page primer. |
I'm just playing devil's advocate here, not suggesting a change in design philosophy.
Nooge. |
Note that the whole experiment is for AIRFLOW, not waterflow.
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Seems Ben is learning.
One does not look at a pretty picture and jump to conclusions about what the picture means. I don't think anyone could realize without reading the article that this simulation was for *air flow* and thus serves no purpose for waterblocks. Although, looking at the realm of Reynolds numbers in the charts should have been a clue. Their theoretical equations seem right, if it helps anyone. :D Alchemy |
I would imagine that water would provide similar result (having NOT read the article, looked at the graphs, or anything). Both results are probably going to be similar because both of them probably are caused by the same thing: clearing out the old and bringing in the new balanced with maximal pressure against the target area.
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The (big) paper claims that an angle of 75 deg provides maximum heat transfer, but does make a note that the airflow is restricted at the bottom of the "windshield", by the "dash". At least, that's the way I read it. Anyone else catch this any different?
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Well ,most us understand how it means nothing for our uses Ben...
Hes talking about a none submerged jet of water ,shooting into the wind versus a submerged jet impingment creating velocity and forcing the boundary layer into a smaller envelope, and thus bring the thermal resistance down, to acheive a lower C/W. |
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