Abstract—In this study, normal scale air-water two-phase flow experiments and a new method were carried out to identify the momentum characteristic of churn flow pattern. To acquire proper and sufficient information for the complicated flow pattern, narrow differential pressure (NDP) and conductivity probes signals were measured simultaneously and analyzed. The experiments were performed under the conditions whose superficial gas velocity (Jg) and the superficial fluid velocity (Jf) were 6.28 m/s and 0.0236-0.9912 m/s, respectively. Through visualization and pressure signals analysis, the air-water interaction of churn flow could be categorized into two types: Helmholtz type and disperse type. The diverse characteristics and various combination ratios of these two types of different air-water interaction are the reasons that make churn flow a more complex regime than the others. Through signal separation methods, the quantified characteristics of each type as well as the variation originated from flow rate changing of these two air-water interaction could be revealed.
Index Terms—Air-water two-phase flow, churn flow, momentum characteristic, pressure signals, visualization, transient signal analysis.
The authors are with National Tsing Hua University, Taiwan (e-mail: zody1994@gmail.com).
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Cite: H.-J. Lin, M.-S. Lin, P.-S. Ruan, S.-W. Chen, J.-D. Lee, and J.-R. Wang, "Transient Pressure Analysis and Air-water Interaction in Churn Flow," International Journal of Materials, Mechanics and Manufacturing vol. 6, no. 6, pp. 397-401, 2018.
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