Keyur Kanade
Ansys Employee

Hello,

Choked flow typically occurs in a compressible gas flow through a Venturi tube (CD nozzle). For a fixed upstream pressure, as the downstream pressure is reduced, the mass flow rate at the throat of the CD nozzle increases. However, upon reaching a limit, a further decrease in the downstream conditions does not increase the mas flow rate of the fluid at the throat. This condition is referred to as a choked flow. The mass flow rate is dependent only on the upstream conditions as well as the density of the gas and does not depend on the downstream conditions.

Thanks.