*3.1. Aerodynamic Characteristics of Particle*

In this paper, the Euler method was used to analyze the motion of airflow. However, for the particles, its concentration is relatively sparse, and its molecular weight is much greater than that of gas molecules. Thus, the Lagrange method was used to calculate the motion trajectory of the particles. In addition, the effect of the airflow phase on the particle phase was considered, but the effect of the particle phase on the airflow phase was neglected.
