8.34 The exhaust duct for a clean room test chamber is 150-mm in diameter and 7 m long. The duct originally had a square-edge entrance, but it was replaced by a well-rounded entrance. The pressure in the chamber is maintained 2.5 mm of water above ambient.

Neglect the friction losses in the short duct and determine the volume flow rate for the original square-edge entrance and the well-rounded one.