IMECH-IR  > 力学所知识产出(1956-2008)
Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35
Zheng X(郑旭); Li ZH(李战华); Zhanhua SILBER-LI(李战华)
Source PublicationExperiments in Fluids
2008
Volume44Issue:6Pages:951-959
ISSN0723-4864
Abstract

In this work, we measured 14 horizontal velocity profiles along the vertical direction of a rectangular microchannel with aspect ratio alpha = h/w = 0.35 (h is the height of the channel and w is the width of the channel) using microPIV at Re = 1.8 and 3.6. The experimental velocity profiles are compared with the full 3D theoretical solution, and also with a Poiseuille parabolic profile. It is shown that the experimental velocity profiles in the horizontal and vertical planes are in agreement with the theoretical profiles, except for the planes close to the wall. The discrepancies between the experimental data and 3D theoretical results in the center vertical plane are less than 3.6%. But the deviations between experimental data and Poiseuille's results approaches 5%. It indicates that 2D Poiseuille profile is no longer a perfect theoretical approximation since a = 0.35. The experiments also reveal that, very near the hydrophilic wall (z = 0.5-1 mu m), the measured velocities are significantly larger than the theoretical velocity based on the no-slip assumption. A proper discussion on some physical effects influencing the near wall velocity measurement is given.

KeywordParticle Image Velocimetry Slip Flow Microfluidics Motion Wall
Subject Area实验流体力学
DOI10.1007/s00348-007-0454-4
Indexed BySCI
Language英语
WOS IDWOS:000256755400010
WOS KeywordPARTICLE IMAGE VELOCIMETRY; SLIP; FLOW; MICROFLUIDICS; MOTION; WALL
WOS SubjectEngineering, Mechanical; Mechanics
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/33012
Collection力学所知识产出(1956-2008)
Corresponding AuthorZhanhua SILBER-LI(李战华)
Recommended Citation
GB/T 7714
Zheng X,Li ZH,Zhanhua SILBER-LI. Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35[J]. Experiments in Fluids,2008,44,6,:951-959.
APA Zheng X,Li ZH,&Zhanhua SILBER-LI.(2008).Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35.Experiments in Fluids,44(6),951-959.
MLA Zheng X,et al."Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35".Experiments in Fluids 44.6(2008):951-959.
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