直微通道中的电黏性效应

罗艳; 李鸣; 杨大勇

doi:10.13433/j.cnki.1003-8728.2017.0214

直微通道中的电黏性效应

doi: 10.13433/j.cnki.1003-8728.2017.0214

罗艳¹,
李鸣^2, ,,
杨大勇²

1.
南昌大学机电工程学院, 南昌 330031;
2.
南昌大学信息工程学院, 南昌 330031

基金项目:

国家自然科学基金项目（11302095）资助

详细信息

作者简介:
罗艳(1990-),硕士研究生,研究方向为机械动力学和计算流体力学,13576997924@163.com

通讯作者:
李鸣(联系人),教授,博士,Liming@ncu.edu.cn

计量
- 文章访问数: 193
- HTML全文浏览量: 37
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2015-07-29
- 刊出日期: 2017-02-05

Electroviscous Effects of Power-law Fluids in Microchannels

Luo Yan¹,
Li Ming^{2
, ,},
Yang Dayong²

1.
School of Mechanical & Electrical Engineering, Nanchang University, Nanchang 330031, China;
2.
Information Engineering School, Nanchang University, Nanchang 330031, China

摘要

摘要: 为了研究直微通道中幂律流体的电黏性效应，建立了压力驱动微通道内流体流动的数学模型，其中双电层电势分布、流体流动及流动粒子输运特性分别由Poisson-Boltzmann（P-B）方程、Navier-Stokes（N-S）方程及Nernst-Plank（N-P）方程描述。讨论了微通道中有电黏性效应时溶液浓度；幂律指数对微通道内流体的速度分布、流动电场强度的影响。结果表明：对于nn的增大而减小，变化非常明显；而对于n>1的剪切变稠流体，黏度和流动速度几乎不受n的影响，在实际应用中可以忽略不计。
- 幂律流体 /
- 电黏性效应 /
- 幂律指数 /
- 流动电场强度 /
- 速度分布
Abstract: This paper aims to investigate the power-law fluid flow in microchannel with eletrokinetic effects. In the entire analysis, the electric double layer (EDL) potential is described by the Poisson equation. The flow and transport of the power-law fluid is characterized by the Navier-Stokes equation and the Nernst-Plank equation. Numerical simulation is carried out for all values of the flow behavior index from 0.4 to 1.2. The effects of the flow behavior index, ionic concentration and channel dimension on fluid velocity distribution, streaming potential and apparent viscosity are discussed. The results show that the eletroviscous effect on the flow depends significantly on the flow behavior index. For the shear thinning fluid of the flow behavior index nn>1, the influence of the flow behavior index on the velocity and streaming potential can be neglected in practical application.
- power-law fluid /
- electroviscous effect /
- flow behavior index /
- streaming potential /
- velocity distribution

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参考文献(19)

[1]	Squires T M, Quake S R. Microfluidics:fluid physics at the nanoliter scale[J]. Reviews of Modern Physics, 2005,77(3):977-1026
[2]	Cheng S B, Skinner C D, Taylor J, et al. Development of a multichannel microfluidic analysis system employing affinity capillary electrophoresis for immunoassay[J]. Analytical Chemistry, 2001,73(7):1472-1479
[3]	Buchholz B A, Doherty E A S, Albarghouthi M N, et al. Microchannel DNA sequencing matrices with a thermally controlled "viscosity switch"[J]. Analytical Chemistry, 2001,73(2):157-164
[4]	Choban E R, Markoski L J, Wieckowski A, et al. Microfluidic fuel cell based on laminar flow[J]. Journal of Power Sources, 2004,128(1):54-60
[5]	谭德坤,刘莹.双电层效应对压力驱动微流体流动及传热的影响[J].机械工程学报,2012,48(18):144-151 Tan D K, Liu Y. Electrical double layer effect on pressure-driven liquid flow and heat transfer in microchannels[J]. Journal of Mechanical Engineering, 2012,48(18):144-151 (in Chinese)
[6]	李战华,吴健康,胡国庆,等.微流控芯片中的流体流动[M].北京:科学出版社,2012 Li Z H, Wu J K, Hu G Q, et al. Fluid flow in microfluidic Chips[M]. Beijing:Science Press, 2012 (in Chinese)
[7]	Lyklema J. Fundamentals of interface and colloid science:soft colloids[M]. London:Academic Press, 2005
[8]	Hunter R J. Zeta potential in colloid science:principles and applications[M]. London:Academic Press, 2013
[9]	Ren L Q, Li D Q, Qu W L. Electro-viscous effects on liquid flow in microchannels[J]. Journal of Colloid and Interface Science, 2001,233(1):12-22
[10]	Yang C, Li D Q. Analysis of electrokinetic effects on the liquid flow in rectangular microchannels[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 1998,143(2-3):339-353
[11]	Davidson M R, Harvie D J E. Electroviscous effects in low Reynolds number liquid flow through a slit-like microfluidic contraction[J]. Chemical Engineering Science, 2007,62(16):4229-4240
[12]	Berry J D, Foong A E, Lade C E, et al. Electroviscous resistance of nanofluidic bends[J]. Physical Review E, 2014,90(4):043008
[13]	Vasu N, De S. Electroviscous effects in purely pressure driven flow and stationary plane analysis in electroosmotic flow of power-law fluids in a slit microchannel[J]. International Journal of Engineering Science, 2010,48(11):1641-1658
[14]	Wang M R, Chang C C, Yang R J. Electroviscous effects in nanofluidic channels[J]. The Journal of Chemical Physics, 2010,132(2):024701
[15]	Ren C L, Li D Q. Electroviscous effects on pressure-driven flow of dilute electrolyte solutions in small microchannels[J]. Journal of Colloid and Interface Science, 2004,274(1):319-330
[16]	Chhabra R P, Richardson J F. Non-Newtonian flow in the process industries:fundamentals and engineering applications[M]. Oxford, Boston, MA:Butterworth-Heinemann, 1999
[17]	Wang J K, Wang M R, Li Z X. Lattice Poisson-Boltzmann simulations of electro-osmotic flows in microchannels[J]. Journal of Colloid and Interface Science, 2006,296(2):729-736
[18]	龚磊,吴健康.微通道液体流动双电层阻力效应[J].应用数学和力学,2006,27(10):1219-1225 Gong L, Wu J K. Resistance effect of electric double layer on liquid flow in microchannel[J]. Applied Mathematics and Mechanics, 2006,27(10):1219-1225 (in Chinese)
[19]	Tang G H, Ye P X, Tao W Q. Electroviscous effect on non-Newtonian fluid flow in microchannels[J]. Journal of Non-Newtonian Fluid Mechanics, 2010,165(7-8):435-440