bg.gif"> Notes on compressible gas flow calculations.

• The formulas for compressible gas were taken from Engineering Fluid Mechanics, 3rd edition, by Roberson/Crowe.
• As the flow of a gas goes from laminar to turbulent and approaches sonic, the Cd factor (Coefficient of discharge) goes to unity. The Cd factor is a measure of the vena contracta, which does not exist at sonic or very turbulent flow.
• The algorithm used here checks to see if the flow is sonic. If the flow is sonic, the Cd factor is omitted or considered to be unity.

Back Compressible gas ESEOD calculator. .