In previous studies of flow rate transients in two-phase pipe flows, the behaviour of the flow has been deduced from arrays of local measurements. It is difficult to obtain the full picture from these measurements. The present study uses Electrical Capacitance Tomography (ECT) to determine the time varying cross sectional distribution during transients. Step changes, both positive and negative, have been tracked using ECT and flow and pressure measurements in the stratified and slug flow regions for an air/kerosene flow in a 440 diameter long straight pipe. Simple explanations are provided for the main features of the transients.
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