The dispersion characteristics of droplets in swirling turbulent flow field is a difficult problem in the process of fluid mechanical design and optimization. A new concentric rotating cylinder is used to obtain uniformly distributed flow field. On the basis of Hinze's model, the influence of oil droplet viscosity on oil droplet dispersion characteristics is considered. The relationship between turbulent flow field and oil droplet dispersion characteristics is preliminarily discussed. The empirical relationship between flow field characteristics and oil droplet dispersion characteristics is obtained when Reynolds number is 5.5×104~2.4×105 and relative centrifugal force is 21.9~643.3.The research on dispersion characteristics of oil and water in swirling turbulent field is improved, which provides a new research idea for the liquid⁃liquid dispersion characteristics in swirling turbulent flow field.

Non⁃metallic pipes are widely used in the gathering process and oil pipeline due to their excellent performance，but the calculation of the friction coefficient is still in the exploration stage. In this paper，the effects of the surface roughness and wettability of the inner wall surface of the oil pipeline on the frictional resistance of the fluid in the process are summarized，and the surface slip effect caused by the change of surface wettability is introduced. The wettability of the inner wall surface of the liquid and the pipe and the influence mechanism of the boundary slip effect on the friction coefficient along the path are discussed. The results show that the friction coefficient is affected by the roughness of the inner surface, the wettability of the fluid and the inner surface, the surface slip effect caused by the wettability and the surface tension of the liquid.