Characteristic Analysis of Gas/Liquid Two-Phase Flow Regimes Based on Wavelet Packet Entropy

The identification of flow regime is the basis for measuring flow parameters in two-phase flow accurately. Because of the complexity of phase interaction in gas-liquid two-phase flow, it is difficult to discern its flow regime objectively. In this paper, the 208 measured data from electrical resistance tomography (ERT) are arranged into series based on section to investigate the dynamic characteristics of gas-liquid two-phase flow. Then wavelet packet entropy and wavelet packet node energy are applied to analyze the characteristic of gas-liquid two-phase flow. The results show that the diversified distribution of node energy in wavelet packet can reflect the changing in inner structure of flow regime. Meanwhile, the wavelet packet entropy, which is sensitive to the flow regime transition, can characterize the nonlinear dynamics of gas-liquid two-phase flow. They also provide an efficient supplementary to reveal the flow regime transition mechanism of gas/liquid two-phase flow.