Development of Gas-Liquid Slug Flow Measurement Using Continuous-Wave Doppler Ultrasound and Bandpass Power Spectral Density

This paper addresses the issues of slug detection and characterization in air-water two-phase flow a vertical pipeline. A novel non-invasive measurement technique using continuous-wave Doppler ultrasound (CWDU) bandpass power spectral density (BPSD) is proposed for multiphase applications compared with more established gamma-ray densitometry measurement. In this work, analysis time-frequency CWDU performed to infer applicability BPSD method observing front trailing bubbles flow. The used piezo transmitter/receiver pair an ultrasonic frequency 500 kHz. Signal processing on demodulated signal was done Butterworth filter which reveals slugs from background bubbles. experiments were carried out 2” pipeline-riser at process system engineering laboratory Cranfield University. 2-inch test facility experiment made up 54.8 mm internal diameter 10.5 m high riser connected 40 long horizontal Taylor generated quick-closing air valve placed bottom underwater flow, rates 0.5 litres/s, 2 4 litres/s. spectrum measured along shown describe distinctive nature slugs.