Multiscale Voltage Reconstruction with Attention-based network for Volume Fraction Prediction of Industrial Oil-Water Two-Phase Flow by EIT

Oil-water two-phase flow as a typical two-phase flow type widely exists in various industrial processes and the accurate measurement of oil volume fraction (VF) plays a significant role in transporting and separating oil-water mixture in the processes. Electrical impedance tomography (EIT) as a merging technology with the advantages of noninvasive, low cost, and real-time measurement is widely applied in the industrial field to measure the VF for different types of two-phase flows. However, the measurement process of taking homogeneous reference voltages is time-consuming and costly. To cope with the problem, in the article, by establishing an end-to-end mapping between measurement voltages and VF, we propose an attention UNet-fully connected (AU-FC) architecture. Relying on the attention mechanism, the reconstructed voltages having a strong correlation or a weak correlation with VF are highlighted or suppressed, respectively. Oil-water two-phase flow experiment was conducted in the NEL facility to collect EIT voltage data. Compared with six state-of-the-art and existing machine learning methods, the proposed method performs better in predicting VF. The results indicate that the proposed AU-FC architecture can accurately and real-time predict the VF of oil-water two-phase flow, which improves the application potential of EIT combined with deep learning method in the industrial field.