Consider again flow through the elbow analyzed in Example 4.6. Using the given conditions, calculate the minor head loss coefficient for the elbow. Air flows out of a clean room test chamber through...

Consider again flow through the elbow analyzed in

Example 4.6. Using the given conditions, calculate the minor

head loss coefficient for the elbow.

Air flows out of a clean room test chamber through a

150-mm-diameter duct of length L. The original duct had

a square edged entrance, but this has been replaced with a

well-rounded one. The pressure in the chamber is 2.5 mm of

water above ambient. Losses from friction are negligible

compared with the entrance and exit losses. Estimate the

increase in volume flow rate that results from the change in

entrance contour.