微通道中极性流体流动特性的研究

李卓; 唐桂华; 陶文铨

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微通道中极性流体流动特性的研究

专题研究 | 更新时间：2025-12-08

- 微通道中极性流体流动特性的研究
- Investigation on Flow Characteristics of Polar Fluids in Microchannels
- 西安交通大学学报 2007年41卷第3期页码：274-278
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2006-08-09. 作者简介: 李卓(1975～),女,博士生;陶文铨(联系人),男,教授,博士生导师,中国科学院院士. 基金项目: 国家自然科学基金资助项目(50476046,50406020);国家重点基础研究发展规划资助项目(2007CB2067002)
- DOI：
  中图分类号： TK124
- 网络首发：2007-03-10，
  
  纸质出版：2007
- 稿件说明：
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李卓, 唐桂华, 陶文铨. 微通道中极性流体流动特性的研究[J]. 西安交通大学学报, 2007,41(3):274-278.

李卓, 唐桂华, 陶文铨. Investigation on Flow Characteristics of Polar Fluids in Microchannels[J]. 2007, 41(3): 274-278.
李卓, 唐桂华, 陶文铨. 微通道中极性流体流动特性的研究[J]. 西安交通大学学报, 2007,41(3):274-278. DOI：

李卓, 唐桂华, 陶文铨. Investigation on Flow Characteristics of Polar Fluids in Microchannels[J]. 2007, 41(3): 274-278. DOI：

摘要

采用数值模拟方法确定极性流体电黏性对于微通道内流动摩擦系数的影响

并与文献中的实验结果进行了比较.所采用的极性流体是具有不同离子浓度和导电率的去离子水和自来水.采用有限容积法详细研究了通道壁面电势、流体离子浓度、导电率和通道几何特征对双电层、电黏性和摩擦系数的影响.数值模拟结果表明:极性流体电黏效应的影响是否可以忽略

要根据通道当量直径与双电层厚度的比值r来决定

比值越小电黏影响越大.根据实验条件得到当r

min

≈15时

电黏效应是完全可以忽略的

但如果r继续减小到10时

电黏效应不能忽略.

Abstract

In order to examine the electroviscous effect of polar fluids on the friction factor for the laminar flow in microchannels

the numerical investigations were conducted

and the results were compared with the experimental data available in literature. Deionized water and tap water with different ion concentration and electrical conductivity were used as the working fluid. The finite volume method was adopted to discretize the governing equations. The effects of electrical potential

fluid ion concentration

electrical conductivity and the channel dimensions on the electrical double-layer profile

electroviscous effect and the friction coefficient were explored in detail. The numerical simulation results indicate that whether the electroviscous effect should be considered is determined by the ratio of channel hydraulic diameter to the Debye thickness. Smaller ratio leads to greater electroviscous effect. According to the experimental conditions

the electroviscous effect can be neglected completely at the ratio of 15. If the ratio decreases to 10

the electroviscous effect should be considered.

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references

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李卓, 吕嘉喜, 何雅玲, 等. 微圆管内液体流动与换热特性的实验研究[J]. 工程热物理学报, 2006,27(5):829-831.

Li Zhuo, Lv Jiaxi, He Yaling, et al. Experimental study of liquid flow and heat transfer in microtubes[J]. Journal of Engineering Thermophysics, 2006, 27(5):829-831.

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陶文铨. 数值传热学[M]. 2版. 西安: 西安交通大学出版社, 2001: 290.

Gu Yongan, Li Dongqing. The ζ-potential of silicone oil droplets dispersed in aqueous solutions [J]. Journal of Colloid and Interface Science, 1998, 206(1): 346-349.

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