Flow regime identification in horizontal pneumatic conveying by nonintrusive acoustic emission detection |
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| Authors: | Peng Zhang Sihang Tian Yao Yang Zhengliang Huang Jingyuan Sun Zuwei Liao Binbo Jiang Jingdai Wang Yongrong Yang Lei Xie Hongye Su |
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| Affiliation: | 1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China;2. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China;3. College of Control Science and Engineering, Zhejiang University, Hangzhou, China |
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| Abstract: | This work investigated flow regimes identification in horizontal pneumatic conveying from the scope of particle motions based on acoustic emission detection. Results showed that the variation of acoustic energy and acoustic energy fraction could be used to identify the transition between suspension flow and stratified flow. Near the transition point, the acoustic energy was maximum, and the energy fraction of particle-wall collision mutated at high mass fluxes. Furthermore, the fluctuation distribution index (FI) was constructed learning from the concept of polymer molecular weight distribution index, and the “circumferential fluctuation difference (D)” was defined. Based on this, new identification criteria and flow regime diagram were established. In suspension flow, D >0. In stratified flow, D <0. While in slug flow, D ≈ 0. According to these criteria, flow regimes can be identified independently of changing trends of measurement parameters. The universality of above criteria was further verified under different operating conditions. |
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| Keywords: | acoustic emission detection flow regime identification fluctuation distribution index moment method pneumatic conveying |
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