Quote:
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Originally Posted by mwolfman
The thing is that most of your pump losses happen in the channels towards the cooling block
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Rough breakdown of total pressure-drop of block as percentage for each section:
The following are all calculated pressure drops for a certain flow rate, and applied as a percentage of the total pressure drop of the block at that flow rate:
2.9% due to tubing->barb transition
0.15% due to barb length traversal
-1.1% due to plenum spread (pressure gain due to sudden expansion)
2.8% due to plenum->jet intake transition
60% due to jet acceleration stage (constriction transition into jet tube proper)
10% due to jet tube length friction
From here on with the remaining 25% of the block's pressure drop it gets a little murky as to the exact breakdown of the following, and these are just my estimates:
~15% total pressure drop due to jet exhaust back-pressure due to proximity of jet nozzle discharge to base-plate (best practical example of why can be felt when holding a garden hose at full blast and bringing it close to a wall - you can feel the hose pushing itself away from the wall) - basically this is the focused jet impingement pressure-drop cost
~1% due to discharge of flow from cup (squishing between cup and jet tube walls - includes transition from cup base up past bottom of jet tube)
~9% total pressure drop due to exit/discharge of water-flow through jet nozzle array and out the discharge ports to the exit barb
Of all the various pressure drop transition points in the block, I don't feel that there's a whole lot more that could be done, even across a selection of points, to significantly improve the overall picture. I broke down every transitional point and optimised every one that I could in the G7.