圆柱形微管道内双层牛顿流体电渗流动  

Two-layer Electroosmotic Flow of Newtonian Fluids in a Microtube

作　　者：曾钰琨 邓曙艳 石晓君 卢锦华 肖钰涛 ZENG Yukun;DENG Shuyan;SHI Xiaojun;LU Jinhua;XIAO Yutao(College of Mechanical and Electrical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China;College of Architectural Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China)

机构地区：[1]广东石油化工学院机电工程学院,广东茂名525000 [2]广东石油化工学院建筑工程学院,广东茂名525000

出　　处：《广东石油化工学院学报》2021年第3期50-53,57,共5页Journal of Guangdong University of Petrochemical Technology

基　　金：国家自然科学基金青年项目(11902082);广东省普通高校青年创新人才类项目(2018KQNCX165);茂名市科技计划(2019408);广东石油化工学院人才引进项目(2018rc16)。

摘　　要：为了深入了解微流动系统内双层流体的流动,研究了微圆柱形管道内双层电渗流的流动特性。在Debye-Hückel线性假设下,考虑液-液界面上的Maxwell剪切匹配条件和电势差,首先利用泊松-玻尔兹曼方程描述了双层流体内电势分布,推导了描述双层流场的动量方程;其次,根据贝塞尔方程的性质,首次解析求解了双层电势分布和双层流场分布,讨论了双层电渗流的速度剖面随外层流体电渗特性(固-液界面附近的双电层电动宽度和zeta电势)以及内层流体电渗特性(液-液界面附近的双电层电动宽度和电势差)的变化,为精确控制微流动系统内双层流动提供理论指导。In an effort to investigate the hydrodynamical features of two-fluid flows in microfluidics,the two-layer electroosmotic flow of Newtonian fluids in a microtube is studied.Under the framework of Debye-Hückel approximation,the Poisson-Boltzmann equation governing the two-layer electric potential distribution and the momentum equation describing the two-layer velocity distribution have been developed,and the analytical solutions for electric potential and velocity field are firstly solved based on the characteristics of Bessel equation.The two-layer velocity profiles are evaluated for different electroosmotic characters of peripheral fluid(electrokinetic width of electric double layer and zeta potential near the solid-liquid interface)and electroosmotic characters of inner fluid(electrokinetic width of electric double layer and zeta potential difference near the two-liquid interface)thereby the theoretical base is provided to the precise control and optimization for two-layer fluid system in microfluidics.

关 键 词：双层电渗流 双电层电动宽度 速度剖面 zeta电势 液-液界面电势差 

分 类 号：O32[理学—一般力学与力学基础]