Abstract：Through establishing the mathematical model of water particles in the pipeline, water mist motion in the pipeline is theoretically analyzed, and the motion and trajectory equations of water mist motion in the pipeline are obtained;the numerical simulation shows that the velocity of mixture fluid tends to stabilize after 0.5 m along the axis.The simulation results match with the theoretical analysis, which provides a basis for understanding the problem of settlement.

Keyword：water mist particles;gas flow;numerical simulation;pipeline;