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Definition of Critical flow

Critical flow Definition from Science & Technology Dictionaries & Glossaries
Oil and Gas Field Glossary
The rate of a compressible fluid flow through an orifice or small opening in which the velocity of the fluid reaches a maximum and remains constant. The rate of the fluid flow is directly proportional to upstream pressure and changes only with upstream pressure. Changes in downstream pressure have a negligible effect on flow rate when critical velocity is obtained.
Critical flow Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
(1) The flow conditions at which the discharge is a maximum for a given specific energy, or at which the specific energy is a minimum for a given discharge. (2) In reference to Reynolds' critical velocities, the point at which the flow changes from streamline or non-turbulent to turbulent.