Pressure drop induced by an orifice plate on a mixture of air and water flowing horizontally in the slug regime

An experimental analysis of the pressure drop induced by an orifice plate on a mixture of air and water flowing horizontally in slug regime is carried on. The pressure drop is not steady, but fluctuates around a mean value due to the intermittent nature of the slug flow. The analysis focus on the pressure drop mean value and its fluctuation around the mean value, the correlation between high and low pressure fluctuation and the occurrence of gas at the orifice throttle. Also the signal time and frequency domain are explored l. The experimental work is developed employing a fixed liquid and gas superficial velocities of 0.3 m/s and 0.5 m/s, respectively, and explore the effects of the area contraction ratio and the orifice plate distance from the air-water mixer.