Choked flow

Choked breeze is a compressible breeze effect. The constant that becomes "choked" or "limited" is the velocity.

Choked breeze is a aqueous activating action associated with the Venturi effect. If a abounding aqueous at a accustomed burden and temperature passes through a brake (such as the throat of a convergent-divergent bill or a valve in a pipe) into a lower burden ambiance the aqueous acceleration increases. At initially subsonic upstream conditions, the attention of accumulation assumption requires the aqueous acceleration to access as it flows through the abate cross-sectional breadth of the restriction. At the aforementioned time, the Venturi aftereffect causes the changeless pressure, and accordingly the density, to abatement after accomplished the restriction. Afraid breeze is a attached action which occurs if the accumulation breeze amount will not access with a added abatement in the after burden ambiance while upstream burden is fixed.

For constant fluids, the concrete point at which the asthmatic occurs for adiabatic altitude is if the avenue even acceleration is at sonic altitude or at a Mach amount of 1.123 At afraid breeze the accumulation breeze amount can be added by accretion the upstream pressure, or by abbreviating the upstream temperature.

The afraid breeze of gases is advantageous in abounding engineering applications because the accumulation breeze amount is absolute of the after pressure, depending alone on the temperature and burden on the upstream ancillary of the restriction. Under afraid conditions, valves and calibrated breach plates can be acclimated to aftermath a adapted accumulation breeze rate.