Pressure across an orifice/choke plate

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To calculate the diameter of an orifice plate for restricting mass flow to 1.5 kg/s of compressed air at 400 psia and 300K, understanding pressure dynamics is crucial. When fluid flows through an orifice, total pressure does indeed drop due to energy losses, primarily from friction and turbulence, which are related to momentum losses. While static pressure decreases and velocity increases, the conservation of energy principle indicates that total pressure must also decrease. This relationship is essential for designing an effective choke plate. Clarifying these concepts will aid in achieving the desired flow rate.
scienc
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Hi,
I've been trying to calculate the diameter for an orifice plate so that when inserted in a pipe it restricts the mass flow to the value I want (1.5 kg/s of compressed air, total pressure= 400 psia, T=300K). So essentially I am trying to design a choke plate. When a flow goes across an orifice plate, does the total pressure drop ? I can understand that the static pressure drops and velocity increases. But I simply can't get why the total pressure has to drop. Does it have something to do with momentum losses ?
Answering this would really help me sort out my confusion.

Thanks
N
 
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