# Two-Parameter Probabilistic Model and Experimental Research on Micron Particle Deposition
## 3 Results and Discussion
### Simulation Results and Test Results
#### 3.3.2 Particle Deposition of Simulation Results  
In order to visually characterize the influence of particle size on deposition position, combined with the two-parameter probability deposition model proposed in this paper, the deposition position distribution of the particles is quantified by extracting the deposition mass per unit area recorded in the UDM, and the particle deposition efficiency results of each pipe wall in the gas transmission pipeline are expanded along the pipe length and characterized by a broken line diagram, as shown in Figure 7.  
Figure 6: Cloud map of particle concentration distribution of gas pipeline at 12 m/s wind speed. (**a**) Cloud map of 10 \(\upmu\)m particle concentration distribution. (**b**) Cloud map of 10 \(\upmu\)m particle concentration distribution at Y = 25 D cross-section. (**c**) Partial enlarged cloud view of (**b**). (**d**) Cloud map of 40 \(\upmu\)m particle concentration distribution. (**e**) Cloud map of 40 \(\upmu\)m particle concentration distribution at Y = 25 D cross-section. (**f**) Partial enlarged cloud view of (**e**). Figure 7a shows the particle deposition efficiency of the particles with a particle size of 10 \(\upmu\)m on each pipe wall in the gas transmission pipeline. It can be seen that particle deposition occurs on all four wall surfaces, among which the total deposition efficiency of the lower wall is 6.07 \(\times\) 10\({}^{-4}\) kg/s, slightly higher than the average total deposition efficiency of the right wall and the left wall of 5.67 \(\times\) 10\({}^{-4}\) kg/s and that of the upper wall of 3.77 \(\times\) 10\({}^{-4}\) kg/s. However, there is no quantitative difference in particle deposition efficiency on each wall surface. The deposition efficiency of the 10 \(\upmu\)m particles fluctuates slightly along the pipe length, and the maximum deposition interval is not significant. The above deposition rules are mainly due to the diffusion deposition mode of 10 \(\upmu\)m particles; the difference in deposition rules on each wall surface is small, and the deposition positions are relatively scattered and random. The particle deposition efficiency of particles with a particle size of 40 \(\upmu\)m on each pipe wall in the gas transmission pipeline is shown in Figure 7b, in which the deposition distribution is dominated by the lower wall, reaching 1.57 \(\times\) 10\({}^{-3}\) kg/s. The average total deposition efficiency of the right wall and the left wall is 3.63 \(\times\) 10\({}^{-4}\) kg/s, which is much higher than that of the upper wall (1.59 \(\times\) 10\({}^{-4}\) kg/s), and the maximum deposition interval is obvious. The sedimentation efficiency has a peak value in the region of 13 D-28 D (the sedimentation efficiency in this region exceeds the total sedimentation efficiency by 52.04%), which is mainly due to the sedimentation of 40 \(\upmu\)m particles, mainly manifested by gravity sedimentation and inertia sedimentation. The sedimentation distribution law is obviously dominated by the lower wall region, and the sedimentation efficiency has a peak value in the region of 13-28 units in the aspect ratio of the gas transmission pipeline. After entering the flow field, particles with a diameter of 10 \(\upmu\)m are partially deposited with the airflow in the turbulent region where the flow field is not fully developed, and the velocity is lower than the critical deposition velocity of the law. The kinetic energy loss caused by the collision and rebound of the undeposited particles at the entrance of the square tube results in the particles reentering the flow field and accelerating, and then waiting for the next collision or being carried away by the fluid; the particles are deposited almost all over the channel. After entering the fluid, particles with a particle size of 40 \(\upmu\)m mainly show inertial deposition and gravity deposition, and the deposition distribution  
Figure 7: Simulation results of particle deposition in gas pipelines at 12 m/s wind speed.