Kuang, BoyuNnabuife, Somtochukwu GodfreySun, ShuangWhidborne, James F.Rana, Zeeshan A.2022-01-312022-01-312022-01-19Kuang B, Nnabuife SG, Sun S, et al., (2022) Gas-liquid flow regimes identification using non-intrusive Doppler ultrasonic sensor and convolutional recurrent neural networks in an S-shaped riser, Digital Chemical Engineering, Volume 2, March 2022, Article number 1000122772-5081https://doi.org/10.1016/j.dche.2022.100012https://dspace.lib.cranfield.ac.uk/handle/1826/17523The problem of gas-liquid (two-phase) flow regime identification in an S-shaped riser using an ultrasonic sensor and convolutional recurrent neural networks (CRNN) is addressed. This research systematically evaluates three different schemes with four CRNN-based classifiers over fourteen experiments. Four metrics are used as the evaluation criteria: categorical accuracy, categorical cross-entropy, mean square error (MSE), and computation graph complexity. Compared with existing results, a compatible performance is achieved while considerably reducing the model complexity. The testing and validation accuracies were 98.13% and 98.06%, while the complexity decreased by 98.4% (only 117,702 parameters). The proposed approach is i) accurate, low complexity, and non-intrusive and hence suitable for industry, and ii) could provide a benchmark for flow regime identification.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Two-phase flowFlow regime identificationUltrasonic signalTime-domain propertyDeep learningArticle