| Abstrakt: |
Rapid economic development has made the problem of air pollution increasingly serious, and all sectors of society have begun to focus on air pollution. Throughout the world, there are air pollution problems in various countries, which have threatened the survival and healthy life of human beings, and the main factor leading to air pollution is suspended particulate matter in the air. It is of great significance to study the airflow characteristics of the alvear area of the lung alar region of ordinary adults, ordinary exercisers, and athletes, as well as the deposition of respirable particulate matter, to understand the transport mechanism of gas and particulate matter, and to evaluate the effect of enterable lung particulate matter on different types of people. Based on the Weibel-A model data, this paper establishes a normal alvear model by hypothetical simplification and reflects the kinetic mechanism of lung rhythm contraction/expansion by introducing dynamic wall boundary conditions. Numerical simulations are used to study the deposition characteristics of alveolar airflow and particles in ordinary adults, ordinary exercisers, and long-distance runners, as well as the effects of alveoli obstruction. By simulating the airflow and particle deposition characteristics of the alveoli in the lungs, it is found that compared with the fixed alveolar wall condition, the active alveolar wall condition can enhance the convection flow of the alveolar inflow field, more realistically reflect the gas flow in the alveoli, and the movement of the alveolar wall surface increases the particle deposition rate. In the range of 0.05-3 µm particle diameter, long-distance runners have the largest particle deposition rate, while the particle deposition rate of ordinary exercisers and ordinary adults is not much different. The results showed that under the same exposure environment, ordinary exercisers, ordinary adults, and longdistance runners are more likely to be invaded by atmospheric suspended particulate matter. [ABSTRACT FROM AUTHOR] |
