Flow meter technology could benefit process industries

The team behind the technology at Huddersfield University believes the extra data provided would prove useful in process industries, particularly oil, for plant optimisation.

Magnetic flow meters rely on the electromagnetic induction created by a conducting fluid, for example, water that contains ions. The resulting potential difference is proportional to the flow velocity perpendicular to the flux lines.

‘Most magnetic flow meters make a single potential difference measurement across the diameter of the pipe, and they use that one voltage measurement to obtain the mean flow velocity,’ Prof Gary Lucas of Huddersfield told The Engineer. ‘What we’re doing here is to take several voltage measurements between pairs of electrodes spaced all around the circumference of the pipe, and use those to reconstruct the velocity distribution.’

This is important because if, for example, you have a horizontal pipeline with most of the oil flowing quickly along the top and most of the water flowing slowly at the bottom you can’t work out the exact oil and water flow rates unless you can differentiate the velocities in different parts of the pipe.