# Two-Parameter Probabilistic Model and Experimental Research on Micron Particle Deposition
## 1 Introduction
While reducing the surgical infection rate of patients, it can reduce the dosage of antibiotics before and after surgery and avoid the imbalance of body flora and immune function caused by the long-term application of broad-spectrum antibiotics [16]. To sum up, the application of ultra-clean ventilation technology has had an inestimable impact on the progress of modern science and technology, and it has become one of the core conditions for scientific and technological progress in the civil and national defense fields. The key to ultra-clean ventilation technology lies in the control of the migration and deposition of micron particles in the ventilation gas phase. Therefore, it is of great theoretical and engineering significance to study the deposition of micron particles in gas pipelines. At present, numerical simulation and experimental simulation are mainly used to study the deposition of micron particles, and the Lagrangian particle trajectory method is the main method of numerical simulation. Simulations usually assume that the particle mass concentration in the airflow is very small, and the particles in the turbulence do not affect the turbulence structure. [PERSON] and [PERSON] [17] have simulated the deposition law of particles in smooth channels, considering Stokes drag, shear lift, and the Brownian diffusion of gravity. It is proved that the walled settlement of large particles in the inertial region of particles is affected by wall rebound. [PERSON] and [PERSON] [18] simulated the deposition of large-size particles in vertical circular pipes by the direct numerical simulation (DNS) and the large eddy simulation (LES) methods, and obtained the finding that the deposition rate of particles in an inertial buffer zone on the wall surface will decrease with the increase in particle size. [PERSON] [19; 20] used the DNS method to simulate vertical migration, and the Lagrangian method was used to track particles in a particle diffusion collision zone only considering particle drag force. [PERSON] [21] numerically simulated vertical migration using the DNS method, and then simulated particle deposition in the channel using the particle motion equation with optimized lift. [PERSON] [22] studied the influence of different pipe shapes on particle deposition in supercritical CO\({}_{2}\) and found that rectangular ribs and semicircular ribs arranged in the pipe are conducive to particle deposition, and that the deposition efficiency of a rectangular ribbed pipe is higher than that of a semicircular ribbed pipe. [PERSON] [23] analyzed the deposition process of MgO particles and a calcium carbonate mixed system on a copper heat exchange surface by a molecular dynamics simulation method, and discussed the influence of concentration on deposition characteristics of mixed scales by changing the calcium carbonate concentration. [PERSON] [24] established a finite difference-lattice dynamics coupling model to analyze the deposition characteristics of calcium carbonate on the heat transfer surface of microchannels, and discussed the influence of the distribution spacing and height of surface microstructure units on scaling behavior. Most of the studies described above assume that particles collide with clean walls, and mechanical analysis at the moment of collision is used as the basis for determining whether particles are deposited. However, in the actual deposition process, particles not only collide directly with the wall, but also collide with the deposited particles on the wall. The difference between the two deposition targets will inevitably lead to a change in the basis for judging particle deposition, which will lead to a difference in particle deposition efficiency and deposition distribution calculation, and thus lead to inaccurate results of the particle deposition law. On the other hand, experimental simulation is the key means to reveal the complex physical mechanism of movement and the mechanical characteristics of the flow field in the study of the migration and deposition law of micron-sized particles [25].