液体沿固体边界无滑移假设的实验根据

Experimental Data Showing No Sliding Movement of Flowing liquid on Solid Surface.

研究固体壁面润湿特性对液体运动的影响问题,在工程实践和理论研究方面都具有重要意义。分析了牛顿液体粘性系数测量、速度剖面测量、管道水力阻力实验以及倾斜面上珠状凝结和膜状凝结等典型流动的实验结果,表明除了高浓度聚合物溶液情况不清外,还未发现经过严格论证的由滑移引起的异常效应,相反,却证明了壁面润湿无可测性影响,说明液流的壁面滑移一般可忽略不计,液体沿固体边界无滑移假设一般是正确的。讨论了Maxwell—Knudsen理论的意义,认为Maxwell等人的工作,以丰富的想象力对壁面滑移的主要机制作了极有价值的概括,对于从理论上定性分析液体的壁面滑移问题以及定量分析宏观验证性实验都有重要意义。

It is of significance to study the affact on liquid movement caused by the surface moisture of a solid object in engineering practice and theoretical research. Analysis is done on the measurement of Newtonious Fluid viscosity coefficient, speed profile, experiments on hydraulic friction in a pipeline, the typical movement of the formation of pearls and film on the inclined plane, etc. All the experiments show that no movement caused by sliding is found on the surface of a solid object except that no high density polymer liquid is clearly seen. But on the contrary, it is proved that no measurable affact is seen caused by surface moisture indicating that the sliding movement of a liquid flow can be negalected. It is a correct definition that no sliding movement accurs when a liquid moves along the surface of a solid object. Discussed also in the paper is the significance of Maxwell-Knudsen Theory. The scientists gave a very valuable summary on the main mechanism, which is of very important for qualitative analysis on the surface sliding movement, quantitative analysis and verification experiments.