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arhanbezbora
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What would be the effect on a choked mass flow rate if there were fluctuations in the downstream pressure?
Thanks
Thanks
Upstream pressure will change the density and thus change the mass flow through the nozzle. An increase in pressure will not increase the velocity though. The downstream pressure changes will not be able to propagate upstream to the choked area so the downstream pressure change will never be seen by anything upstream.jaap de vries said:I thought that wit chocked flow upstream pressure did not effect the flow rate?!
arhanbezbora said:What would be the effect on a choked mass flow rate if there were fluctuations in the downstream pressure?
Thanks
The choked mass flow rate refers to the maximum amount of mass that can flow through a restricted orifice or nozzle, when the flow velocity reaches the speed of sound. This is also known as the critical flow rate.
Downstream pressure fluctuations can lead to changes in the flow velocity and can cause the choked mass flow rate to deviate from its maximum value. This is known as choked flow instability and can result in unpredictable flow behavior.
Downstream pressure fluctuations can be caused by various factors such as changes in the downstream pressure, flow disturbances, or changes in the upstream flow conditions. These fluctuations can also be affected by the geometry and design of the flow system.
The effect of downstream pressure fluctuations on choked mass flow rate can be measured using various flow measurement techniques such as pressure sensors, flowmeters, orifice plates, or venturi tubes. These instruments can provide real-time data on the flow rate and pressure fluctuations.
Downstream pressure fluctuations can have a significant impact on industrial processes that involve choked flow, such as gas pipelines, chemical reactors, and control valves. These fluctuations can affect the accuracy and stability of the process, leading to potential safety hazards and operational inefficiencies.