Relationship and interaction between subsystems in gas-solid two-phase flow system of dense phase pneumatic conveying based on Empirical Mode Decomposition
Signal analysis was used to investigate the interconnection and interaction between the subsystems in the two-phase flow system of dense-phase pneumatic conveying.Firstly,based on empirical mode decomposition(EMD),electrostatic signals of a gas-solid two-phase flow system were decomposed into several signal components,namely intrinsic mode function(IMF)and the IMF1—IMF4,which were determined as major components by comparing the energy ratios of each IMF component.Afterward,subsystems of the gas-solid two-phase flow system were identified based on the decomposition results of electrostatic signals,the distribution of particles in the conveying pipeline,and the differences in particle motion mechanisms.Finally,the relationship and interaction between subsystems were inspected by the variation regulars of the dominant frequency and variance of IMF1—IMF4,respectively.Results show that:there are four subsystems within the whole two-phase flow system in the horizontal pipeline,which are the particle-fluid mixture in the dilute-phase area,the junction area,the dense-phase area,and the wall-attached area.Subsystems are related to each other by particles traveling between them.There is also an interaction between subsystems,which is a competition between particle-dominated and airflow-dominated mechanisms,and the competition becomes more and more furious when particle suspension is weak.In contrast,the competition weakens when particle suspension is good.
empirical mode decompositiongas-solid two-phase flow system of the dense phase pneumatic conveyingsubsystems
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