The Visualization Method for the Study of Dust Dispersion Process
Abstract: To gain an insight into the dust dispersion behaviors, a visualization device was developed based on a modified Siwek 20 L spherical chamber. By using high-speed camera and image processing technique, the evolution of dust cloud transmission was obtained during the dispersion process of magnesium particles. Comparative analysis shows that the transmission varies accordingly with the variation of dust cloud concentration, and through the transmission-time trace, the motion state and distribution uniformity of dust cloud can be clearly recognized. In the early stage of dust dispersion, the transmission trace decreases quickly with time because of the fast injection of dust particles, and then fluctuates rapidly with large but relatively stable amplitude, indicating that the dust cloud in the early stage is in a strongly turbulent state, so that all particles are suspended and the average concentration in the chamber is nearly constant. After early stage, the turbulence in-tensity attenuates rapidly and dust particles begin sediment, so that the transmission trace follows an increasing trend, indicating that actual concentration of dust cloud becomes steadily decreased. Compared with the PRL optical dust probe method, the current method can provide more objective transmission-time traces to characterize the variation of dust cloud in the dispersion process.
文章引用: 刘 龙 , 杜 兵 , 黄卫星 , 任一丹 , 王瀚霖 (2015) 粉尘云形成过程的可视化研究方法。 流体动力学， 3， 1-10. doi: 10.12677/IJFD.2015.31001
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