| The influence of nano-particle tracers on the slip length measurements by microPTV | |
Zheng X(郑旭); Kong GP(孔高攀) ; Li ZH(李战华); Silber-Li, ZH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
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| Source Publication | ACTA MECHANICA SINICA
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| 2013-06-25 | |
| Volume | 29Issue:3Pages:411-419 |
| ISSN | 0567-7718 |
| Abstract | 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 hypothesis and experimental results from other techniques. To better interpret the measured results of the microPIV/PTV, we performed velocity profile measurements near a hydrophilic wall (z = 0.25-1.5 mu m) with two sizes of tracer particles (phi 50 nm and phi 200 nm). The experimental results indicate that, at less than 1 mu m from the wall, the deviations between the measured velocities and no-slip theoretical values obviously decrease from 93% of phi 200 nm particles to 48% of phi 50 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 hydrophilic 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. |
| Keyword | Micropiv/ptv Slip Length Nano-particle Tracer Particle Concentration Distribution Boltzmann Distribution |
| Subject Area | 实验流体力学 |
| URL | 查看原文 |
| Indexed By | SCI ; EI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000323736400012 |
| Funding Organization | National Natural Science Foundation of China [10872203]; National Basic Research Program [2007AC744701]; CAS Research and Development Program of China [KSCX2-YW-H18] |
| Department | LNM微纳米流体力学 |
| Classification | 二类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/47451 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Silber-Li, ZH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Zheng X,Kong GP,Li ZH,et al. The influence of nano-particle tracers on the slip length measurements by microPTV[J]. ACTA MECHANICA SINICA,2013,29,3,:411-419. |
| APA | Zheng X,Kong GP,Li ZH,&Silber-Li, ZH .(2013).The influence of nano-particle tracers on the slip length measurements by microPTV.ACTA MECHANICA SINICA,29(3),411-419. |
| MLA | Zheng X,et al."The influence of nano-particle tracers on the slip length measurements by microPTV".ACTA MECHANICA SINICA 29.3(2013):411-419. |
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