If d=0.25m and d=0.40m. assume headloss from the contraction to the end of the pipe can be found as hų = 0.9 (v is velocity in the pipe of diameter d). what height, h, will cause cavitation if atmospheric pressure is 100 kpa (abs)? what is the discharge when cavitation begins? water t-20°c

Height=14.25 m

Discharge=

Explanation:

Bernoulli’s equation for the two points, let’s say A and B is given by

But since the elevations are the same then

Since then

From continuity equation

and substituting 0.4 for D and 0.25 for d

and substituting with we have

Since is taken as 1 then

v=6.49 m/s

Since discharge=

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