# Two-Parameter Probabilistic Model and Experimental Research on Micron Particle Deposition
## 3 Results and Discussion
### Particle Migration and Deposition Experiment  
#### 3.2.1 Experimental Platform for Particle Migration and Deposition Simulation  
Based on the experimental platform for particle migration and deposition simulation, the micron-scale pollution particle migration and deposition test was carried out under working conditions, and the experimental platform is shown in Figure 5.  
In order to achieve the simulation of the whole process of particle migration, it is equipped with a flow field generator equipped with an explosion-proof fan. The fan speed is adjustable from 0 to 6000 rpm, and the blades can be replaced. Through a suitable ratio, it can provide a uniform working condition of 0-15 m/s in the inlet section. Environmental wind speed experimental conditions can be set for particles with the deflector. The experimental simulation of migration and deposition provides a stable flow field environment. The particle disperser is equipped with a gas-phase agitation device composed of four magnetic fans at different angles to each other, which is used to fully and evenly disperse a large volume of gas-solid two-phase flow. During the test, the particles are injected into the cavity through a V-shaped particle deflector under micro-pressure to achieve the uniform dispersion of the particles input. The particle transport and deposition pipeline adopts a segmented design, and the main body of the pipeline is a double-layer stainless steel structure with a square section, which can be freely connected through flanges and angle adapters. The inner diameter of the nozzle D = 150 mm, square section, the length of each section L = 10 D = 1500 mm, and the maximum working pressure is 4 MPa. The pipeline can be divided into two types: an optical observation pipeline and optical measurement pipeline. Among them, the optical observation pipeline has two pairs of circular optical glass observation windows with an opening diameter of 90 mm, two groups of temperature and pressure acquisition sensors,  
Figure 5: Experimental platform for particle migration and deposition simulation. 1—Flow field generator; 2—particle disperser; 3–particle sedimentation migration pipeline; 4—particle collection system; 5—multi-channel data acquisition controller. and one group of hot-wire wind speed acquisition sensors. Meanwhile, it is equipped with a precision proportional gas distribution device, a pressure relief bursting disc, and multiple groups of detachable installation flanges for detecting the expansion of sensors. The optical measurement pipeline is provided with four-way omni-directional optical glass visible windows, which are respectively arranged at the upper and lower wall surfaces and the left and right wall surfaces of the pipeline in the middle position; each group of optical windows is strictly parallel; the window size is 1200 mm\(\times\)135 mm; high-purity fused silica glass is adopted; the transmittance is greater than 90 percent; the transmission wavelength range is 200-1000 nm; the surface accuracy is 1/4 wavelength (328 nm); and optical detection conditions, such as particle velocity measurement and the like, can be met. In addition, each pipeline is equipped with a particle deposition collection plate and an installation groove, which can be used to change the roughness of the pipe wall, the material of the pipe wall, and the morphology of the collected particle deposition. The particle collection system consists of a centrifugal fan, a cyclone dust collector, a gas-liquid separation device, and an exhaust gas filtration device, which can realize the pollution-free collection and discharge of experimental particles, waste liquid, and exhaust gas.