How to determine resistance square area?
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After reading a book on fluid mechanics, I felt it was too confusing and I didn’t understand it very well in a short time. Is there a simpler way to judge? The general situation I am facing now is as follows: Our company plans to build a new water testing device to calculate the flow rate that a 35-meter-high stable pressure water tower can achieve. From the water tower entrance to the pipe outlet, there are local resistance parts such as pipes, valves, flow meters, elbows, etc. of varying sizes. I am calculating the resistance system along the way. When counting, we consider the resistance square area, but the actual situation is that at the maximum flow rate of various test pipe sections, the flow rate of different pipe diameters in the entire device may vary from 0.05 to 7m/s (due to diameter changes). I wonder if this calculation is correct in this case? Please correct me if there is any unclear description.
I'll give it a try myself and wait for the expert's answer online: L
This is what Crane Co. recommends； Take the friction coefficient to change no more than 0.5% as the boundary line, that is, Re=3200/(K/d)