Discussion of 'Discharge Coefficients for Orifices Cut into Round Pipes' by Alex J. McLemore, John S. Tyner, Daniel C. Yoder, and John R. Buchanan

摘要

The authors are appreciated for a useful contribution regarding the discharge coefficient for flow into orifices cut with a circular bit perpendicular to and along the centerline of a round pipe, and the discusser would like to draw attention to some points. As mentioned by the authors, the orifice area is generally defined as the area of the bit used to cut the hole, but the true orifice area is larger than the bit due to the curvature of the riser pipe. Prohaska et al. (2010) studied flow into a riser while assuming the orifice area equal to the bit area. McLemore et al. (2011) provided several descriptions for the orifice area.