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How to calculate mass flow rate?

How to calculate mass flow rate?

How to calculate mass flow rate?

(OP)
Hello guys!

Air (compressible fluid) and water (Incompressible fluid) is allowed to flow through a tube without mixing with each other. I need to find the flow rate at the outlet (both air and water flow rate). How this can be done? By what device we can find? Any idea?

thanks & regards,
Davy

RE: How to calculate mass flow rate?

What class is this for?

RE: How to calculate mass flow rate?

Normally two ways of doing this (two phase flow metering)

Either run it into a separator / knock out drum and then maintain the water level and measure gas flow and water flow separately or use a multiphase meter.

Also if you measure what goes in then what comes out will be the same....

This is very vague and hence I'm afraid gets you a vague answer. Depending on the different quantities, velocity of each fluid and orientation of the pipe, your air and water may mix, become a mist, annular flow (really odd), slug flow, wavy flow...

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: How to calculate mass flow rate?

first of all, how do you "not allow it to mix". that would not be a simple task.

RE: How to calculate mass flow rate?

If the two are separated completely - like a sewage pipe or irrigation ditch with laminar gravity flow ? - then you'd need an air flow detector (propeller ?) in the top, and a separate flow indicator in the bottom. But you need a level detector and pressure gage as well as a velocity detector.

If mixed flow in a confined chamber?

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