中文摘要：

直接测量滑倒长度在固体附近基于测量液体速度边界。然而，追踪大小报导了的 velocimetry (microPIV/PTV ) 的以前的微粒子图象 velocimetry/particle pressuredriven 的令人惊讶地大的测量近墙的速度从另外的技术与没有滑倒假设和试验性的结果流动在明显的矛盾。更好解释 microPIV/PTV 的测量结果，我们在一面吸水的墙附近执行了速度侧面大小(z = 0.251.5 m ) 与 tracer 粒子(50 nm 和 200 nm ) 的二种尺寸。试验性的结果显示那，在从墙的不到 1 m，在测量速度和没有滑倒之间的偏差理论价值显然从 200 个 nm 粒子中的 93% 个减少到 50 个 nm 粒子中的 48% 个。墙附近的指数的测量粒子集中被发现的象 Boltzmann 一样。基于粒子集中和有效焦点飞机厚度的非线性的 Boltzmann 分发，我们在墙附近说明了明显的速度增加的原因并且建议了一个方法改正测量速度侧面。由这个方法，在改正的测量速度之间的偏差和没有滑倒从 45.8% ～ 10% 的理论速度减少，并且测量在吸水的玻璃上滑动长度从 75 nm 被修订到 16 nm。这些结果显示粒子尺寸和偏导的粒子集中分发罐头显著地经由 microPIV/PTV 影响近的墙速度测量，并且导致更大的测量速度并且滑动长度结束围。

英文摘要：

Direct measurement of slip length is based on the measured fluid velocity near solid boundary. However, previous micro particle image velocimetry/particle tracking velocimetry （microPIV/PTV） measurements have reported surprisingly large measured near-wall velocities of pressure-driven flow in apparent contradiction with the no-slip hy-pothesis and experimental results from other techniques. To better interpret the measured results of the microPIV/PTV, we performed velocity profile measurements near a hy-drophilic wall （z = 0.25-1.5 μm） with two sizes of tracer particles （φ 50 nm and φ200 nm）. The experimental results indicate that, at less than 1 μm from the wall, the deviations between the measured velocities and no-slip theoretical values obviously decrease from 93% of φ200 nm particles to 48% of φ50 nm particles. The Boltzmann-like exponential measured particle concentrations near wall were found. Based on the non linear Boltzmann distribution of particle concentration and the effective focus plane thickness, we illustrated the reason of the apparent velocity increase near wall and proposed a method to correct the measured velocity profile. By this method, the deviations between the corrected measured velocities and the no-slip theoretical velocity decrease from 45.8% to 10%, and the measured slip length on hy-drophilic glass is revised from 75 nm to 16 nm. These results indicated that the particle size and the biased particle concentration distribution can significantly affect near wall velocity measurement via microPIV/PTV, and result in larger measured velocity and slip length close to wall.