Method for measuring particle local structure in sparse two-phase flow

Abstract

The invention relates to a method for measuring a particle local structure in sparse two-phase flow. The method comprises the following steps of acquiring a fluidized particle image, carrying out feature extraction and screening on the fluidized particle image after background denoising and binarization processing to obtain a pixel value of a white light spot on each particle, positioning each particle, and determining a coordinate value of each particle under a rectangular coordinate system, constructing a Voronoi diagram of a corresponding particle system according to the coordinate value ofeach particle, and calculating a local volume fraction of each particle, constructing a contact model comprising seven topological structures, and determining a bond orientation sequence parameter Qnof each particle, performing local structure matching and color characterization on each particle in combination with the contact model, calculating the azimuth angle of each particle, establishing aparticle local structure change curve, and completing measurement of the local structure of the fluidized particles. Compared with the prior art, the local structure of the fluidized particles can beaccurately measured, and visualization processing of the local structure is achieved.

Description

technical field [0001] The invention relates to the technical field of particle flow local structure measurement, in particular to a method for measuring particle local structure in sparse two-phase flow. Background technique [0002] In the fields of petroleum, chemical industry, energy, metallurgy, materials, environmental protection, etc., there are a large number of fluidization processes of viscous particles. Due to the existence of liquid bridges between cohesive particles, the particles adhere to adjacent particles to form different local structures. Agglomeration and agglomeration are easy to occur during the fluidization process, which will weaken the gas-solid contact in the reactor and reduce production efficiency. In the study of the fluidization process of viscous particles, the most fundamental and direct thing is to study the local structure of viscous particles in sparse two-phase flow, so measuring the change of local structure of viscous particles in the p...

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Problems solved by technology

[0003] At present, in the description of the particle flow structure, the distribution function of statistical physics is used to describe the approximate local structure of the particle flow, such as the radial distribution function method. Density distribution, but this method can only judge the density of the local structure of the particle flow, and cannot measure the topological structure of the particle; in addition

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