化工学报2016，Vol.67Issue(10)：4126-4134,9.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
Drag reduction of superhydrophobic microchannels based on parabolic gas-liquid interfaces
摘要
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 onfRe, 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 thatfRe 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 affectedfRe. With increase of the parabolic height, the ratio of normalized pressure drop and the normalized slip length decreased linearly, howeverfRe 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.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Key words
superhydrophobic surfaces/microchannels/numerical simulation/gas-liquid interface/laminar flow/microscale/two-phase flow分类
数理科学引用本文复制引用
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):4126-4134,9.基金项目
国家自然科学基金项目（11202079）；河北省自然科学基金项目（A2015502058）。@@@@Foundation item:supported by the National Natural Science Foundation of China (11202079) and the Natural Science Foundation of Hebei Province (A2015502058) （11202079）
