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.