Particle Deposition Models for Ventilation Air Ducts

This paper presents the results of a study of calculation models for the different mechanisms for particle deposition in ducts, and investigates their relative importance. The models are discussed and analyzed, and compared to measurements found in the literature. Turbulent deposition, sedimentation, Brownian diffusion, thermosphoreris, natural electric charge effects, and inertial impaction are considered. The results of the study form the basis for a computer program to simulate the fouling process in a network of ducts including bends. The simulation and results of studies using the program, including recommendations for the design of duct systems will be described in a later paper.

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