Effect of textured hydrophobic surfaces on laminar drag reduction

被引：0

作者：

Ogata, Satoshi ^{[1
]}

Shimizu, Keigo ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397

来源：

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2009年 / 75卷 / 758期

关键词：

Air water interface; Drag reduction; Pressure loss; Textured hydrophobic surface; Visualization;

D O I：

10.1299/kikaib.75.758_1960

中图分类号：

学科分类号：

摘要：

We studied the mechanism of drag reduction due to the textured hydrophobic surfaces in Newtonian laminar flow through a rectangular channel. Fine fabrication was given to the test wall surface so that the groove pattern and the groove area ratio may be changed methodically, and the surface was coated with PTFE for hydrophobic processing. Drag reduction was estimated by pressure loss measurement in a 12 × 12 mm channel. Visualization experiment was carried out using a 0.5X5 mm microchannel. Shear rate is changed with the result of pressure loss measurement and the form of the air-liquid interface was visualized. A series of experiments showed that the air-water contact area ratio and the air layer thickness influence the drag reduction, and the maximum drag reduction ratio is 3.7%.

引用

收藏

页码：1960 / 1966

页数：6

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