Measurement of the local properties of multiphase flows

This paper reviews a range of tomographic instruments and local intrusive flow probes designed and used by the author for making measurements of the local properties of water
continuous two phase flow in which the dispersed phase volume fraction is too high for non-invasive optical techniques such as PIV to be used. The paper considers the
design of dual-plane electrical resistance tomography systems and of different types of local conductance probe including two-sensor and four-sensor needle probes and a
robust six-electrode probe. Results are presented from measurements obtained in inclined and swirling multiphase flows. Finally, the paper goes on to discuss recent work
undertaken by the author to develop a novel, non-intrusive electromagnetic instrument for measuring the axial velocity distribution of the continuous phase in solids-inwater, oil-in-water and air-in-water flows.