Question

A small plastic pipe carries water horizontally at a speed of
10 m s?1. A section of the pipe bulges out so that the radius is twice
that of the rest of the pipe. If the gauge pressure in the pipe is ordi-
narily+90 kPa what is the gauge pressure in the bulge (in kPa) (the density of water is 1000 kg m?3)? Give your answer in kPa.

Answer 1

Answer 2

Using equation of continuity,

v1*A1 = v2*A2

velocity at larger radius is = 2.5 m/sec

Using Bernoulli 's equation,

P + rho*g*h + 0.5*rho*v^2 = Constant

P-90000 = 0.5 * 1000 * ( 100 - 6.25 )

P = 136.87 kPa