基于抛物线形气-液界面的超疏水微通道减阻特性

doi:10.11949/j.issn.0438-1157.20160629

化工学报 ›› 2016, Vol. 67 ›› Issue (10): 4126-4134.DOI: 10.11949/j.issn.0438-1157.20160629

基于抛物线形气-液界面的超疏水微通道减阻特性

李春曦, 张硕, 薛全喜, 叶学民

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

收稿日期:2016-05-09 修回日期:2016-07-13 出版日期:2016-10-05 发布日期:2016-10-05
通讯作者: 李春曦
基金资助:
国家自然科学基金项目（11202079）；河北省自然科学基金项目（A2015502058）。

Drag reduction of superhydrophobic microchannels based on parabolic gas-liquid interfaces

LI Chunxi, ZHANG Shuo, XUE Quanxi, YE Xuemin

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Baoding 071003, Hebei, China

Received:2016-05-09 Revised:2016-07-13 Online:2016-10-05 Published:2016-10-05
Supported by:
supported by the National Natural Science Foundation of China (11202079) and the Natural Science Foundation of Hebei Province (A2015502058).

摘要/Abstract

摘要：

针对超疏水表面微通道中的流动减阻特性，基于抛物线形气-液界面假设，采用VOF模型模拟了微通道中的二维层流流动，分析了流动和结构参数对减阻效果的影响。结果表明，含矩形微坑的超疏水表面微通道具有显著减阻作用，fRe随Reynolds数增大而略有提高，量纲1压降比随入口速度增大而略有下降。当增大微坑面积比或减小微通道高度时，fRe减小，量纲1压降比增大；且微通道高度越小，微坑面积比对fRe的影响越显著。随抛物线形高度增加，压降比和滑移长度均线性减小，而fRe则线性增加。当微坑深度大于其宽度的40%时，压降比和滑移长度趋于定值。微坑形状对减阻效果的影响依次是燕尾形、矩形、梯形和三角形。

关键词: 超疏水表面, 微通道, 数值模拟, 气-液界面, 层流, 微尺度, 两相流

Abstract:

Based on the model of volume of fluid, two-dimensional fluid laminar flow in superhydrophobic microchannels was numerically simulated with given parabolic gas-liquid interfaces. The effects of several flow and structural parameters on fRe, the normalized slip length and pressure drop were investigated. The results show that superhydrophobic microchannels with rectangular microcavities exhibited significant drag reduction in a way that fRe increased slightly with increase of Reynolds number whereas normalized pressure drop decreased slightly with increase of inlet velocity. When the area ratio of microcavities was increased or the microchannel diameter was decreased, fRe was reduced but normalized pressure drop was enhanced. In case of small microchannel diameter, the area ratio of microcavities significantly affected fRe. With increase of the parabolic height, the ratio of normalized pressure drop and the normalized slip length decreased linearly, however fRe increased linearly. The impact of microcavities on the normalized slip length and the ratio of normalized pressure drop was minimal provided that the microcavity depth was greater than 40% of its width. The dovetail microcavities exhibited the greatest effect on drag reduction, followed by the rectangular, trapezoidal, triangular microcavities in the order of high to low.

Key words: superhydrophobic surfaces, microchannels, numerical simulation, gas-liquid interface, laminar flow, microscale, two-phase flow

中图分类号:

李春曦, 张硕, 薛全喜, 叶学民. 基于抛物线形气-液界面的超疏水微通道减阻特性[J]. 化工学报, 2016, 67(10): 4126-4134.

LI Chunxi, ZHANG Shuo, XUE Quanxi, YE Xuemin. Drag reduction of superhydrophobic microchannels based on parabolic gas-liquid interfaces[J]. CIESC Journal, 2016, 67(10): 4126-4134.

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基于抛物线形气-液界面的超疏水微通道减阻特性

Drag reduction of superhydrophobic microchannels based on parabolic gas-liquid interfaces

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