壁面微结构对超薄液膜流动特性的影响

李春曦; 裴建军; 叶学民

doi:10.7652/xjtuxb201307008

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壁面微结构对超薄液膜流动特性的影响

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- 壁面微结构对超薄液膜流动特性的影响
- Influence of Wall Microscale Topography on Ultrathin Liquid Film Flow
- 西安交通大学学报 2013年47卷第7期页码：40-46
- 作者机构：
  
  华北电力大学电站设备状态监测与控制教育部重点实验室,河北,保定,071003
- 作者简介：
- 基金信息：
  
  : 2012-11-17。作者简介: 李春曦(1973—),女,博士,副教授。基金项目: 国家自然科学基金资助项目(10972077,11202079);中央高校基本科研业务费专项资金资助项目(10MG33)
- DOI：10.7652/xjtuxb201307008
  中图分类号： O363;TQ021
- 网络首发：2013-07-10，
  
  纸质出版：2013
- 稿件说明：
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李春曦, 裴建军, 叶学民. 壁面微结构对超薄液膜流动特性的影响[J]. 西安交通大学学报, 2013,47(7):40-46.

Influence of Wall Microscale Topography on Ultrathin Liquid Film Flow[J]. 2013, 47(7): 40-46.
李春曦, 裴建军, 叶学民. 壁面微结构对超薄液膜流动特性的影响[J]. 西安交通大学学报, 2013,47(7):40-46. DOI： 10.7652/xjtuxb201307008.

Influence of Wall Microscale Topography on Ultrathin Liquid Film Flow[J]. 2013, 47(7): 40-46. DOI： 10.7652/xjtuxb201307008.

摘要

针对非平整基底表面上的超薄液膜流动

采用润滑理论推导出液膜厚度演化方程

并利用PDECOL程序进行了数值求解

分析了不同基底表面液膜轮廓的变化特征及基底结构参数和重力对液膜流动的影响。研究表明:微尺度基底的不平整特征将引起液体局部压力增加或减小

形成隆起或凹陷

使液膜表面发生变形; 台阶、V字形和矩形凹槽等基底的深度增加或斜度减小具有增强液膜表面变形的作用

基底宽度仅在小范围内增加具有放大液膜表面变形的作用; 波状基底高度增大具有增强液膜隆起高度、减弱液膜凹陷深度的作用

波数的作用与之相反; 重力会抑制液膜隆起和凹陷的发生。

Abstract

The lubrication theory was used to derive the evolution equation of thin liquid film thickness. The variations of ultrathin liquid film thickness on different topography surfaces

and the influence of topography structure and gravity were analyzed on the basis of the numerical simulation with the PDECOL code. The results show that microscale topography can cause liquid local pressure to increase or decrease

thus forming the ridge or depression and then leading the free surface of the ultrathin liquid film to be deformed. The increase in topography depth and the decrease in steepness can enhance the deformation of the ultrathin liquid film. The increase in topography width only in a small range can yield the amplification of the ultrathin liquid film deformation. The increase in corrugated topography height can enhance the ridge and mitigate the depression of the liquid film while the wave number of topography has an adverse effect. In addition

gravity can inhibit the formation of the ridge and depression of the ultrathin liquid film.

关键词

Keywords

references

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