Abstract: The reentrainment of the deposited particle aggregates is an important phenomenon in the process of trapping and sampling of diesel engine exhaust particles. The configuration of the deposited particle aggregates has important effect on the force acting on the aggregates and the reentrainment of the aggregates. The static force models of the ellipsoidal deposited particle aggregates are built up based on the models of the spherical aggregates and the characteristics of the ellipsoidal aggregates in order to satisfy the need of the reentrainment research of the deposited particle aggregates, and the force moments of gravity, adhesive force, collision force and aerodynamic drag force acting on the aggregates are analyzed based on the models. The analysis emphasis is the effect of the aggregates configuration on the force moment acting on the aggregates. The result shows that the configuration of the aggregates has important effect on the force moment acting on the aggregates in the pipe flow.

Key words: Deposited particle aggregate, Ellipsoid, Force moment, Model, Reentrainment