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For above pipe or duct flowing (where point A and C are higher diameter than B), same volume flow for point A,B & C.

Velocity B > Velocity A & C ; Pressure energy A > Pressure energy B ; friction pressure B > friction pressure A.

Question one: When pipe or duct sizing to be reducing even re-increasing afterward, the pressure will always drop down and never increase again in the same system without power addition in midway of system?

As I known, the flow rate will be averagely divided to the same size of pipe or duct.

Question two: Could we calculate the volume flow rate & pressure for point B and C which only know size?

(assume the source provides steady and constant power, same length of branch pipe or duct, elbow and fluid: water, constant temp. etc)