ir conditioning ventilation ducts are widely used in contemporary buildings. The change of airflow direction in the ducts local components can easily lead to the deposition of particles

which can easily form a secondary source of indoor air pollution and have an adverse effect on human health. Based on this

this paper utilizes the existing experimental data to validate the numerical simulation. The Reynolds stress turbulence model combined with the method of enhanced wall function was used to investigate the deposition characteristics of fine particles in different local components. For the first time

local deposition rates and deposition hotspots were proposed to analyze the simulation results. The results show that the local deposition rate of the particles with a particle size of 1μm do not differ much on each wall surface

and the particles are deposited more uniformly on each wall at the local components

with a difference of less than 10 %

and the maximum local deposition rate is on the outer wall of the local components. When the particle size is larger than 10μm

the local deposition rate on the outer wall of the local component increases significantly

with a maximum increase of 23.3 % (compared to 5μm particles)

and the maximum local deposition rate increases slowly with increasing air velocity

with a maximum increase of less than 8 %. The effect of increasing particle size on the maximum local deposition rate is much greater than the increase in air velocity. With the increase of air velocity and particle size

the deposition hotspots of both the 90° bend and the T-type tee duct migrate to the middle of the wall

and the deposition hotspots of the 4-way duct migrate to the inside of the wall.