Abstract
The experimental measurements of volume flow-rate of a viscous gas through a nozzle suggest that the flow-rate approaches saturation exponentially with increasing pressure difference across the nozzle. An exponential flow-rate equation has been developed which closely fits the experimental data. The change in the flow-rate due to viscosity is divided into four overlapping phases, which depend on the pressure difference across the nozzle. The analytical function for the fractional change in flow-rate due to viscosity is comprised of four terms which correspond to the four phases. The results verify that the gas flow-rate through a nozzle can be treated exponentially, and the choke flow condition gradually approaches saturation as the pressure difference across the nozzle increases.
Published Version
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