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This study investigates the statistical characteristics of liquid film thickness fluctuations during countercurrent flow limitation on a complex geometry containing a horizontal and inclined pipe which are connected by an elbow. The fluctuation data are obtained by image processing technique which was applied towards high-quality images captured by a high-speed video recording. The result indicates that the thickening of the liquid triggers the liquid blockage that initiates flooding at the upper edge of the hydraulic jump. Moreover, the stochastic analysis reveals that the obtained data imply consistence trends across whole water discharge. Furthermore, it also shows a good agreement to the visual observations. Meanwhile, the wavelet analysis can distinguish energy fluctuations under different water discharges. [ABSTRACT FROM AUTHOR]

Gas-liquid flow can be separated by using a swirl separator. One of the interesting parts to be investigated in the swirl separator is the influence of the pickup tube diameter. Therefore, its influence on the gas-liquid flow behavior inside a vertical pipe equipped with a static swirl separator element is investigated in this study by using computational fluid dynamics (CFD). Euler-Euler approach simulating water as the continuous phase and air as the dispersed phase was selected in this study. The significant difference in the gas-liquid flow characteristics was observed downstream the pickup tube from the simulations using the pickup tube diameter of 4 mm, 6 mm and 8 mm diameter. The best gas removal level was achieved by the pickup tube diameter of 8 mm [ABSTRACT FROM AUTHOR]