Posted by **Michel** on Thursday, April 2, 2009 at 8:53pm.

Lubricating oil, with a relative density of 0.79, flows around a 90¨¬ bend. The pipe diameter is 0.45m, and the oil has a pressure head of 7m and the flow is 1.7m3/s. Find the force exerted by the oil on the bend.

Oil density = 0.79 X 103

Volumetric mass flow rate = 1.7 m3/s

Pipe diameter = 0.45 m

Pressure head (¥÷) = 7m

- physics -
**drwls**, Friday, April 3, 2009 at 10:56am
Use the momentum change law.

The force exerted on the fluid equals the rate of change of the fluid's momentum, which is a vector. For a 90 degree turn, the momentum change vector bisects the angle betweeb the pipes and equals sqrt2 times the momentum flow rate.

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