Experiment and mechanism of
dynamic drag reduction in pipeline transportation①
dynamic drag reduction in pipeline transportation①
(College of Resource, Environment and Civil Engineering,
Central South University of Technology, Changsha 410083, P.R.China)
Central South University of Technology, Changsha 410083, P.R.China)
Abstract: Based on the analysis of the disadvantages of traditional methods in reducing pipeline resistance, the new conception of dynamic drag reduction in pipeline transportation has been proposed. The experimental results and mechanism of dynamic reduction of pipeline resistance were also discussed in detail. The main conclusion is that the dynamic reduction of resistance exerts forces on the moving materials along both the radial direction and the axial direction. The radial force throws the materials upwards to depart from the pipe wall to reduce the frictional force, while the axial force directly reduces the resistance by providing the force to overcome the drag.
Key words: pipeline transportation; dynamic drag reduction; mechanism