Fig. 1

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Diagram of air-water flow loop. (1) compressor; (2) gas flowmeters; (3) T-mixer; (4) 30 mm ID pipe; (5) differential pressure transducer, (6) decantation tank; (7) air outlet; (8) pump; (9) liquid tank, (10) pump; (11) by-pass; (12) ultrasonic flowmeter.