Pressure drop through volumes of compressible fluid

In summary, the conversation discusses estimating pressure in a cavity, specifically P2, and calculating pressure drop across an annulus with known areas A1 and A2. The speaker also mentions assumptions and calculations for velocity and flow rate. Friction losses at the exit pipe are also mentioned, with a formula provided for calculating the pressure drop. However, the speaker is unsure how to calculate losses at the entry and exit of the pipe due to unknown volumes involved.
  • #1
Natalinop
1
0
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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  • #2
What are the volumes involved?
 
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