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Mixing Tube Sizing

post #1 of 6
Thread Starter 
I've got a kit coming to me with 4 1/2" ID 3/4" OD bitspower fittings on them that I would like to keep, but I also ordered 8 Monsoon 7/16" ID 5/8" OD (bought them before I bought the kit). I love the look of Monsoons, but the Bitspower are angled which I like. I've been doing some reading on mixing tubing in the same system and came across this issue of choked flow. For those who don't want to click the link:
Quote:
Originally Posted by Wikipedia 
Choked flow is a fluid dynamic condition associated with the Venturi effect. When a flowing fluid at a given pressure and temperature passes through a restriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid velocity increases. At initially subsonic upstream conditions, the conservation of mass principle requires the fluid velocity to increase as it flows through the smaller cross-sectional area of the restriction. At the same time, the Venturi effect causes the static pressure, and therefore the density, to decrease downstream past the restriction. Choked flow is a limiting condition which occurs when the mass flow rate will not increase with a further decrease in the downstream pressure environment while upstream pressure is fixed.

So I'm wondering if anyone has experience with this actually occurring in such a small system, and I need to get all the same fittings or if I can just mix them.

Thanks!
post #2 of 6
That small of a different won't have any effect at all. I've seen a few other users who have ad to mix tubing sizes so they could use the build in barbs on certain stock motherboard heatsinks, like certain Asus boards.
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post #3 of 6
Thread Starter 
Awesome, thank you!
post #4 of 6
Are you planning on having flow velocities approach the speed of sound in water? If not, don't worry about it.
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post #5 of 6
Completely off topic, @GingerJohn, I like your sense of humor. Your "Inspiring Quotes" in your sig gave me a good laugh. As well as little anecdote under your username lol
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post #6 of 6
I think what he is saying is dont forget to account for the Venturi Effect. By changing for instance from 1/2 inch to 7/16 inch the liquid will move faster through the smaller section, while it is only 1/16th of an inch smaller, the pressure in the lines will go up and so will the velocity. You may need to worry if it was 3/4inch to 1/4 inch but its still something to keep in mind. The real application of this would be like a 1/2 ID split to 2x 1/4 ID to go to pieces separately then rejoin back into a 1/2 later on in the pipe. This will let you keep the same pressure and speed roughly the same. There is a ton more math in it, I dont believe 1/2 inch to 1/4 inch is an even reduction do to the geometric volume each can carry.

Unrelated but still sort of, we blow metal water lines here all the time for the bathrooms because some yahoo took 1 inch to 1/2 inch and it was already a bit high on the pressure. Your plastic lines will blow even easier in pressure changes.
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