Based on the major mechanisms governing particle movement in turbulent boundary layer and the definition of particle deposition velocity,the governing differentiate equation in particle concentration boundary layer and its analytical solution were deduced,and an analytical expression of dimensionless deposition velocity was achieved.

Presents the calculation methods of particle deposition velocity,deposition quantity and penetration rate in smooth ventilation ducts.

The deposition velocity of the different sections duct was determined under the different air speeds and the different particle sizes to the straight horizontal sections and the bend sections of the rectangular ductwork(material is zinc-plated steel),and the relationship between them was analyzed.