Qualitative advice on two phase flow problem.

Click For Summary
SUMMARY

The discussion centers on a two-phase flow problem involving a tank with nitrogen gas (N2) and liquid hydrogen peroxide (H2O2). The tank, constructed from aluminum and resembling the size of a paintball tank, has one opening (A) at a constant pressure of 33 bar and another opening (B) at atmospheric pressure. When opening A is closed with a solenoid valve, the pressure drop is expected to occur rapidly, potentially within 5 seconds, due to the sonic flow conditions created by the significant pressure difference.

PREREQUISITES
  • Understanding of two-phase flow dynamics
  • Familiarity with pressure measurement techniques
  • Knowledge of fluid dynamics principles, particularly choked flow
  • Experience with simulation software such as SolidWorks and COMSOL
NEXT STEPS
  • Research the principles of choked flow in compressible fluids
  • Learn how to model two-phase flow using COMSOL Multiphysics
  • Explore pressure drop calculations in fluid systems
  • Investigate the effects of rapid pressure changes on material integrity, particularly in aluminum tanks
USEFUL FOR

This discussion is beneficial for engineers, fluid dynamics specialists, and researchers involved in two-phase flow systems, pressure vessel design, and simulation modeling.

SteveNgabo
Messages
2
Reaction score
0
Hi guys I have a rather qualitative question. let's imagine a tank with two openings. pressure is measured at one opening (A) to be at a constant 33 bar at time t=0s. the other opening(B) is at atmospheric pressure.
Inside the tank we have a two phase flow half is N2 gas and the other half is H2O2(hydrogen peroxide in liquid form) the tank itself is made out of aluminium for weight saving purposes and it's not very big about the size of a paintball tank.
The question here is if we closed opening A with a valve (solenoid) so that pressure at A becomes 0, how fast would the pressure decrease. I know this is not an easy question because it is time dependent. I had to try and simulate this on solidworks but two-phase flow is not available. So before trying it with Comsol I would like to know maybe from someone's experience if it will be fast pressure drop(<5sec) or a slow one(>10sec)
 
Engineering news on Phys.org
Fast I think.

With a pressure drop as big as that, the flow velocity would be sonic (i.e. choked flow) I assume?

Your description sounds less tank and more a nozzle or a pipe.
 
the B opening leads to a nozzle indeed. Thanks for your insight
 

Similar threads

How long will it take for a gas cylinder to empty?
  • · Replies 18 ·
Replies
18
Views
13K
Controlling two valves with different flow-rates to achieve mixing
  • · Replies 23 ·
Replies
23
Views
5K
Tank Change in Flow Process Modeling
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Feasibility of Micro‑Plasma–Induced Refractive‑Index Phase Modulation
  • · Replies 5 ·
Replies
5
Views
427
How Can Constant Fluid Velocity Be Achieved in a Multi-Vessel System?
  • · Replies 2 ·
Replies
2
Views
6K
Flow Rate of a Liquid: Calculating Mass & Pressure
  • · Replies 6 ·
Replies
6
Views
4K
Two-Phase Pressure Drop (I need an expert)
  • · Replies 0 ·
Replies
0
Views
1K
Modeling a multiple inlet piping system
  • · Replies 3 ·
Replies
3
Views
4K
Bernoulli equation and parallel pipe branch
  • · Replies 31 ·
2
Replies
31
Views
5K
Undergrad Density Siphoning? Solve Problem Now
  • · Replies 6 ·
Replies
6
Views
2K