Imagine you have a vertical pressure head 2m tall with water flowing down to height 0m and emptying. Through this length we have 3 identical tubes of resistance R and length L. Assuming I know the volumetric flow rate(Q) as a function of height, how can I calculate the resistance of each tube? The flow rate decreases linearly with height as the fluid empties and pressure head drops. Should I use the average flow rate on the height interval [0m to 2m] and the max pressure head in my calculation? Or does the resistance change as a function of water level? Intuitively, the tube resistance should be an internal property such that it shouldn't vary. Any guidance would be much appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

Relevant Equations

R=P/Q where P=pgh

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# I Effective Resistance (Fluid Mechanics)

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