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Review on sound speed models in gas-solid two-phase flow based on quantitative comparison

SONG Zhijiang;HU Shangfeng;LI Yanqin;School of Mechanical and Power Engineering, Zhengzhou University;Zhengzhou Aerospace Electronic Technology Co.,Ltd.;  
The acoustic method is an effective method for multiphase flow measurement. Wherein, reliable sound speed model underlines the acoustic method that is based on the sound flight time sheme. This paper systematically sorts out the gas-solid two-phase sound speed models established by different scholars, from different theoretical bearings. In order to intuitively present the difference, development, and defects, quantitative simulation and experimental measurements was performed for comparison and characterization between the sorted four different models. Relative to the coupled sound speed model, the scattering-based model, and the developed pseudo-homogenity model that considers acoustic characteristics, the traditional pseudo-homogenity sound speed model is remarkably smaller in terms of changing particle concentration in the gas-solid two phase flow. The reason was drawn that the latter does not consider the influence of the relative movement between the two phases in flow. By comparison, the other models considering the interaction between different phases give close sound speed values relative to the experimental measurements, with certain small drops.
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