The difference between choked flow and critical flow.
We discuss critical pressure and critical temperature related to fluid phase limits.  We also discuss critical speeds for large machinery.  Please advise the context for critical flow.
Choke refers to the device:  An orifice can be considered Choked if a reduction in downstream pressure will not increase flow. 
Critical refers to the fluid pressures (usually ratio) at the point at which the device becomes "choked"...For gases, the consequence of critical pressure difference is that a reduction in downstream pressure does not increase the flow.  The term critical velocity is also used, and its deviation from the stagnant speed of sound gives some indication of the localized departure from predicted velocity due to the geometry of the device that is choked.

MORE NEWS