润滑脂在钢管中含壁滑移流动的阻力特性  

Resistance property of the lubricating grease flowing in pipes with wall-slip

作　　者：徐桂云[1] 李浴[1] 张永忠[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221008

出　　处：《哈尔滨工业大学学报》2004年第11期1581-1584,共4页Journal of Harbin Institute of Technology

基　　金：中国矿业大学"九五"211工程资助项目(B90901).

摘　　要：以符合Herschel-Bulkley流变模型的润滑脂为试样,以在钢管中的壁滑移实验为基础,系统研究了阻力特性.通过含壁滑移的流动方程研究了壁滑移减阻,得出管径越小、壁滑移速度越大减阻效果越好的结论,为在集中润滑管道输送系统设计中合理地选择管径、管壁材料等提供了理论和实验依据;用量纲分析图解和近似解两种方法,求解了Herschel-Bulkley流动方程的阻力,并通过三维优化计算使得近似解与精确解偏差较小,使得近似解更加实用;推导了层流向紊流转变的判据和转变点速度的临界值.Resistance property is studied systematically using lubricating grease according with rheological model of Herschel-Bulkley as samples and on the basis of the experiment the wall-slip of lubricating grease flowing in steel tube. Using flowing equations to study drag reduction of wall slip, we conclude that the smaller pipe diameter is and the larger wall slip speed is, the better effect of drag reduction is, which lays foundation for rational selection of pipe diameter and pipe material in the design of centralized grease lubrication systems. The method of dimensional analysis scheme and approximate solution are adopted to obtain the resistance of Herschel-Bulkley flowing equation. Through three-dimensional optimization calculation, the difference between approximate solution and accurate solution becomes very small, which make approximate solution more practical. The criterion of transformation from laminar flow to turbulence flow and the critical value of velocity at the point of transformation are deduced.

关 键 词：壁滑移 阻力特性 雷诺数 摩阻系数 减阻 

分 类 号：TH117.2[机械工程—机械设计及理论]