Gas and liquid flow rates in Gas-liquid flow loop

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Discussion Overview

The discussion revolves around the challenges of converting flow rates in a gas-liquid flow loop, specifically focusing on horizontal stratified flow with wave propagation. The participant is attempting to relate measurements from vertical flow meters to the horizontal section of the system, considering pressure drops and temperature changes.

Discussion Character

  • Homework-related
  • Technical explanation
  • Experimental/applied

Main Points Raised

  • The participant presents an equation to convert liquid flow rates from a water turbine meter to the horizontal section, assuming incompressibility.
  • The participant mentions the use of an electromagnetic flow meter and the need to account for pressure drop and temperature change when determining gas flow rates in the horizontal section.
  • Another participant questions the feasibility of understanding the system without diagrams, suggesting that visual aids could clarify the setup.
  • The participant provides diagrams of the system layout, indicating the placement of sensors and flow meters.

Areas of Agreement / Disagreement

There is no consensus yet, as the initial participant is seeking guidance on calculations while another participant emphasizes the need for diagrams to understand the system better. The discussion remains unresolved regarding the specific calculations needed for the flow rates.

Contextual Notes

The discussion may be limited by the lack of detailed assumptions about the flow characteristics and the specific relationships between pressure, temperature, and flow rates in the system.

Who May Find This Useful

Researchers and students working on gas-liquid flow systems, particularly those dealing with flow measurement and conversion in experimental setups.

ben wilkie
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Homework Statement


I'm working on my research project at uni, running a gas-liquid flow loop for horizontal stratified flow exhibiting wave propagation. The equipment I have however is setup to investigate vertical flow primarily and the flow meters are located on the vertical sections. I need to convert the flow rates from the water turbine meter that gives the liquid velocity inside the vertical section using readings from an electromagnetic flow meter. The rates are linked by this equation:

Qw=0.0469xRPM+0.542; where RPM is the revolutions per min given by the water turbine meter.

So i can get the water flow rate from this, and assume it is the same in the horizontal section, incompressible. For the gas flow, I have a air flow meter that says 22 SLPM of air is added to the loop, this is at the bottom of the loop so is not the same as that in the horizontal part.

The pipe diameter is 50mm

I'm trying to convert this reading to the actual flow rate in the horizontal section, based on reading I get for pressure drop between this point and the horizontal section as well as any temperature difference. I'll be using void fraction readings after calculating these flow rates from an EIT system and Wire mesh system to estimate the amount of liquid filling the pipe.

So if my pressure drop between the inlet and the hori section is 20 Pa and the temperature has changed from 20 deg celsius to 20.5 deg celsius and the gas flow meter is reading 22 SLPM, how would I determine the flow rate in the horizontal section.

Homework Equations

The Attempt at a Solution

 
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Hi Ben. Welcome to Physics Forums.

Is it realistic to think that we can figure out what you system(s) look like without your providing diagram(s)?
 
https://scontent-lhr3-1.xx.fbcdn.net/t31.0-8/12968180_1337075979652457_6056805037489347515_o.jpg
 
https://scontent-lhr3-1.xx.fbcdn.net/t31.0-8/12973391_1337075949652460_5051568555513035757_o.jpg

This is a diagram of the system, only difference is that the WMS200 and ERT sensors are located in the horizontal part above the water tank
 

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