Abstract
An impedance probe operating at 20 kHz has been used to measure radial voidage profiles in concurrent gas-liquid upflow in the bubbly flow regime in a 150 mm tube. The probe was found to seriously overestimate voidages at high gas-high liquid flows, probably because of its low operating frequency. Profiles show a core peak in all cases, with little variation in shape as gas and liquid rates vary. This is attributed to the large bubble size produced by the industrial type of distributor.
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