The possible existence of slip of liquids in close proximity to a smooth surface is studied experimentally and numerically via the dynamics of small particles suspened in a shear flow. Sub-micron fluorescent particles suspended in water and imaged using Total Internal Reflection Fluorescence Microscopy (TIRFM) and a PTV algorithm. The measurements are in excellent agreement with Monte Carlo simulations of particle dynamics, and show that the observed "apparent slip velocity" is a direct consequence of the small, but finite, measurement volume, and that slip, if present, is minimal at the low shear rates tested (< 2500 s{sup}(-1)). Issues associated with the experimental and simulation techniques and the interpretation of results are also discussed.
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机译：通过在剪切流动中悬浮在剪切流中悬浮的小颗粒的动态来研究紧邻光滑表面的液体靠近近距离的液体滑动的可能存在。使用全内反射荧光显微镜（TiRFM）和PTV算法悬浮在水中的亚微米荧光颗粒和成像。测量结果与蒙特卡罗模拟的粒子动力学符合很好，并表明观察到的“表观滑移速度”是小，但有限的，测量体积的直接后果，并且如果存在，则滑动在低温下最小剪切速率测试（<2500 s {sup}（ - 1））。还讨论了与实验和仿真技术相关的问题和结果的解释。
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