Pressure drop through volumes of compressible fluid

AI Thread Summary
The discussion focuses on estimating pressure in a cavity (P2) and calculating pressure drop across an annulus. Initial assumptions indicate a pressure drop of ΔP (P1-P2) at 2 kPa, with fluid velocities calculated as v1 = 57 m/s and v2 = 32 m/s. Friction losses in a 600mm pipe with an 8mm diameter are calculated to yield ΔP (P2-P3) at 2.3 kPa. The user seeks clarification on how to calculate losses at the pipe's entry and exit, as well as the volumes involved in these calculations. Understanding these factors is crucial for accurate pressure drop estimation in compressible fluid systems.
Natalinop
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Homework Statement
Pressure drop through volumes of compressible fluid
Relevant Equations
deltaP = 1/2 (density)velocity^2)
Thanks for your response.
I'm trying to estimate the pressure in the cavity, i.e. P2. I know the areas, A1 which in practicality is an annulus and A2 which is a 600m pipe with i/d 8mm.
I would like to initially understand how to calculate the pressure drop across the annulus.

At the moment I'm assuming the pressure drop which is not useful...
ΔP (P1-P2) = 2 kPa
v1 = SQRT(2000*2/1.2)= 57 m/s

Q1 (flowrate) = v1 * 26 = 1482 m2.mm/s

v2 = Q1/A2 = 1482/46 = 32 m/s

Friction losses at exit pipe
Fluid exits container at pipe length of 600mm length (L) and 8mm inner diameter (d)
L/d = 75
f = 0.05

ΔP (P2-P3) = 0.5*1.2*322*75*0.05= 2.3 kPa
NOt quiet sure how to calculate losses at entry and exit of pipe.
 

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What are the volumes involved?
 
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