Simulation of fluid slip at 3D hydrophobic microchannel walls by the lattice Boltzmann meth.pdf

下载文档

5
0
约4.57万字
约 15页
2017-04-06 发布于江苏
举报
版权申诉
保障服务

Simulation of fluid slip at 3D hydrophobic microchannel walls by the lattice Boltzmann meth.pdf

1、本文档共15页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

Simulation of fluid slip at 3D hydrophobic microchannel walls by the lattice Boltzmann meth

Journal of Computational Physics 202 (2005) 181–195 /locate/jcpSimulation of fluid slip at 3D hydrophobic microchannel walls by the lattice Boltzmann method q Luoding Zhu a,*, Derek Tretheway b, Linda Petzold a,b, Carl Meinhart b a Department of Computer Science, University of California Santa Barbara, Santa Barbara, CA 93106, USA b Department of Mechanical and Environmental Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA Received 15 September 2003; received in revised form 15 April 2004; accepted 5 July 2004 Available online 14 August 2004Abstract Fluid slip along hydrophobic microchannel walls has been observed experimentally by Tretheway and Meinhart [Phys. Fluids, 14 (3) (2002) L9]. In this paper, we show how fluid slip can be modeled by the lattice Boltzmann method and investigate a proposed mechanism for the apparent fluid slip [Phys. Fluids (2003)]. By applying an exponentially decaying hydrophobic repulsive force of 4 · 103 dyn/cm3 with a decay length of 6.5 nm, an effective fluid slip of 9% of the main stream velocity is obtained. The result is consistent with experimental l-PIV data and with the proposed mechanism. 2004 Elsevier Inc. All rights reserved. Keywords: Fluid slip; Slip boundary condition; Hydrophobicity; Microfluidic; Lattice Boltzmann method1. Introduction In classical fluid mechanics, the assumption of no-slip at a solid boundary is used as the boundary con- dition for viscous flows at rigid walls. However, for flows at micro- and nanoscales, this assumption may no longer be accurate. Many researchers have investigated the fluid slip phenomenon [3–12,14,21]. Choi et al. [3] investigated experimentally the slip effects of water flow in hydrophilic/hydrophobic microchannels and found the slip length to vary approximately linearly with the flow shear rate. Lumma et al. [4] measured the flow profile near a wall by double-focus fluorescence cross-correlation; their analysis yields a large apparent fluid slip at