Question

A 400 mm diameter pipe, conveying water, branches into two pipes of diameters 300 mm and 200mm respectively. If the discharge in the 400 mm diameter pipe is 380L/s, compute the average velocity in this pipe. If the average velocity in 300mm diameter pipe is 200L/s, find the discharge and velocity head in 200mm diameter pipe.

Answer #1

Discharge in 400 mm diameter = Q = 380 L/s = 0.38 m^3/s

Average Velocity in 400 mm diameter pipe is given as

**= 3.024 m/s**

Velocity in 300 mm diameter pipe = V_{1} = 200 L/s = 0.2
m/s

Discharge in 300 mm diameter pipe is

Let Discharge in 200 mm pipe be Q_{2}

We have

Velocity in 200 mm diameter pipe is

= 11.65 m/s

Velocity head in 200 mm diameter pipe is given as

**= 6.92 m**

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