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Originally Posted by nigelyuen
are you guys comparing big tube vs small tube or high flow vs low flow with same tube?
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Really it's about the flow-rate, not so much the tubing size.
However, the lower the flow rate, then the smaller that the tubing size can be and not play a significant role in the system-wide resistance. i.e. the lower your flow is, the smaller ID tubing that you can use.
If we set an arbitrary limit of 0.5mH2O Pressure-Drop of the tubing in the system, then the following flow-rates are where 2m of that tubing size would offer 0.5mH2O of resistance. The following calculations assume a 0.05mm "roughness" in the tubing's inner surface.
4mm ID => 0.5 LPM
5mm ID => 0.8 LPM
6mm ID => 1.4 LPM
7mm ID => 2.1 LPM
8mm ID => 3.0 LPM
9mm ID => 4.2 LPM
10mm ID => 5.5 LPM
11mm ID => 7.2 LPM
1/2" ID => 10.6 LPM
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Originally Posted by nigelyuen
i think it also depends on what block you test with
if you use a US block, the difference can be big, but if you use a german block, maybe not as much.
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Actually that's a presumption I don't think anyone should form until some blocks are first tested. Have any of us seen such characteristics in "German" blocks? Is it a characteristic of all "German" blocks? Could some "German" blocks have the same performance characteristics as "US" blocks, but because they are so hindered by small tubing and low flow rates that such block designs have been discarded along the way thanks to test-beds like WCP, and never given a chance to shine?