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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.
Source PublicationACTA MECHANICA SINICA
2013-06-25
Volume29Issue:3Pages:411-419
ISSN0567-7718
AbstractDirect 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.
KeywordMicropiv/ptv Slip Length Nano-particle Tracer Particle Concentration Distribution Boltzmann Distribution
Subject Area实验流体力学
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Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000323736400012
Funding OrganizationNational Natural Science Foundation of China [10872203]; National Basic Research Program [2007AC744701]; CAS Research and Development Program of China [KSCX2-YW-H18]
DepartmentLNM微纳米流体力学
Classification二类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47451
Collection非线性力学国家重点实验室
Corresponding AuthorSilber-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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