Local resistivity probe for study of point properties of gas‐liquid flows

Abstract

Abstract In this work a resistivity probe for local property measurements, developed originally (1, 2, 3) for (non‐wetting) mercury‐nitrogen flows, was adapted to a broader class of gas‐liquid flows, such as air‐water. To compensate for the non‐negligible dry‐out time of the probe in aqueous systems, a trigger circuit was installed to sense bubble arrival rapidly. Another problem which was solved was the greater tendency for bubbles in water, as compared to mercury, to deflect away from the probe. The probe signal is an instantaneous record of the arrival and departure of bubbles at any point in the flow, and hence is well‐adapted to auto and cross‐correlation measurements, as well as distribution function studies.