443857 Distinguishing and Prediction Periodic and Chaotic Multiphase Flow in T-Junction Microchannel Obtained from Optical Time-Series Signals

Tuesday, April 12, 2016: 11:05 AM
340A (Hilton Americas - Houston)
Dongyue Peng, Feng Xin and Lexiang Zhang, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China

The stability and regularity of multiphase flow in T-junction microchannel were investigated in this study. In virtue of homemade optical measuring system, time series related to two-phase flow dynamics under different operating conditions, fluids and channel lengths were collected and analyzed through a nonlinear characteristic parameter of Kolmogorov entropy (KE). The results reveal that higher KE corresponds to irregular and unstable flow behavior, while the lower KE refers to desirable operating condition with steady and orderly flow behavior. Meanwhile, most of the Taylor flow regime appeared at proper operating conditions with small KE presented steady flow behavior. In order to further understand and estimate KE, a concise equation derived from definition of KE was proposed, which included bubble break-up impact and flow rate ratio of gas and liquid. Results of the calculations and the experiments were in good agreement. The derived equation possesses effectiveness to identify and ensure stable and predictable multiphase flow in microchannel.

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