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Consider a pipe that branches out into two parallel pipes and then rejoins at a junction...

Consider a pipe that branches out into two parallel pipes and then rejoins at a junction downstream. The two parallel pipes have the same lengths and friction factors. The diameters of the pipes are 2 cm and 4 cm. The flow rate in pipe with 2 cm diameter is 10 L/min.

Draw piping system

What is the flow rate in the other pipe? (L/min)

What is the headloss at the junction? Friction factor is 0.001 and the length of the pipe is 5m.

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