﻿ 非球形颗粒碰撞过程硬颗粒与软颗粒模型比较研究

# 非球形颗粒碰撞过程硬颗粒与软颗粒模型比较研究Comparison of Collision Dynamics of Non-Spherical Particles between the Hard-Particle Model and Soft-Particle Model

Abstract: Non-spherical particles and complex non-spherical particle systems are commonly encountered in energy chemical engineering, mineral engineering, and safety manufacturing engineering. The collision dynamics of non-spherical particles are fundamental issues in the investigations of complex particle systems. Discrete element method is the most prevalent models for particle-particle collision of spherical shapes, which incorporates a spring, a dashpot, and a frictional interaction. In this work, a comparative and analytical study on the mathematical models of collision dynamics for non-spherical particles is carried out. The hard non-spherical particle model and the soft-par- ticle model have been compared. It indicates that agreeable simulation results can be found for the two models. The two models have different advantages or disadvantages in accuracy, computational stability, and feasibility, with particular suitability for different cases.

[1] 桂南. 复杂两相流动中颗粒碰撞的DEM-LES/DNS耦合模拟研究[D].杭州: 浙江大学, 2010.

[2] Hoomans, B.P.B., Kuipers, J.A.M., Briels, W.J. and van Swaaij, W.P.M. (1996) Discrete Particle Simulation of Bubble and Slug Formation in a Two-Dimensional Gas-Fluidised Bed a Hard-Sphere Approach. Chemical Engineering Science, 51, 99-118.

[3] Hoomans, B.P.B. (1999) Granular Dynamics of Gas-Solid Two-phase Flow. Ph.D. Thesis, Netherlands: Maastricht, 146-149.

[4] Cundall, P.A. and Strack, O.D.L. (1979) A Discrete Numerical Model for Granular Assemblies. Geotechnique, 29, 47-65.
https://doi.org/10.1680/geot.1979.29.1.47

[5] Crowe, C.T., Sommerfeld, M. and Tsuji, Y. (1998) Muhiphase Flow with Droplets and Particles. CRC Press, New York.

[6] Gui, N., Yang, X.T., Tu, J.Y. and Jiang, S.Y. (2016) An Extension of Hard-Particle Model for Three-Dimensional Non-Spherical Particles: Mathematical Formulation and Validation. Applied Mathematical Modelling, 40, 2485-2499.

[7] Gui, N., Yang, X.T., Tu, J.Y. and Jiang, S.Y. (2016) A Soft-Sphere-Imbedded Pseudo-Hard-Particle Model for Simulation of Discharge Flow of Brick Particles. AIChE Journal, 62, 3562-3574.
https://doi.org/10.1002/aic.15278

Top