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Mach number

For ideal gas (good assumption for the mixture of the gas leaving the cavity). It becomes

Mach number determine the characteristic of flow in the vent system where the air/gas velocity is reaching to the speed of sound. The air is chocked at the vent exit and in some cases other locations as well for vacuum venting. In atmospheric venting the flow is not chocked for large portion of the process. Moreover, the flow, in well design vent system, is not chocked. Yet the air velocity is large enough so that the Mach number has to be taken into account for reasonable calculation of the .

Genick Bar-Meir |||
copyright Dec , 2006

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