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	基于微空泡效应的疏水性展向微沟槽表面水下减阻研究
	王宝 ; 汪家道 ; 陈大融 ; Wang Bao ; Wang Jia-Dao ; Chen Da-Rong
	2016-03-30 ; 2016-03-30
关键词	水下减阻 气相结构 疏水性微沟槽表面 滑移 drag reduction underwater gas hydrophobic transverse grooved surface slippage O35
其他题名	Drag reduction on hydrophobic transverse grooved surface by underwater gas formed naturally
中文摘要	超疏水表面在水下的减阻效果随着来流冲刷时间的增加会逐渐减小甚至会出现粗糙增阻的现象,而这种现象的本质在于超疏水表面裂隙中驻留的气相结构在来流的作用下会不断地从表面脱离.针对超疏水表面的裂隙中驻留的气相结构在水下不稳定的情况.本文通过对表面微结构的设计,利用疏水性展向微沟槽结构使驻留在沟槽内部的气相结构被相邻沟槽间的脊状结构挡住,从而不能轻易的被水流冲刷掉.实验结果表明该表面不仅能使气相结构在表面微结构内稳定驻留,而且基于稳定驻留在表面结构内的气相结构,在来流作用下会有新的气相结构生成.虽然表面上不稳定的气相结构会随流速的增加而加剧地脱离表面,但是可再生的气相结构能够补充由于冲刷从表面脱离的气体.最终在固/液界面间构建相对稳定的气模.通过粒子图像测速系统(PIV)对近壁面流场进行分析,可得到大于15%的速度滑移量.; Low fluid friction is difficult to obtain on super-hydrophobic surfaces for a large flow velocity, because the entrapped gas within the surface is weakened substantially. Once the gas removed, the friction of the fluid increases markedly due to its own surface roughness. In this study, a hydrophobic transverse microgrooved surface is designed to sustain the air pockets in the valleys for a long time. Direct optical measurements are conducted to observe the entrapped gas when water flows past the surface in the perpendicular direction of grating patterns. More importantly, this hydrophobic transverse micro-grooved surface has been determined to have the capability of automatic formation of gas. Some of the gas is continually carried away from the surface and new gas is continually generated to substitute the lost gas. And the stable slippages at the surface are achieved corresponding to the relative stable gas on this designed surface.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144655]
专题	清华大学
推荐引用方式 GB/T 7714	王宝,汪家道,陈大融,等. 基于微空泡效应的疏水性展向微沟槽表面水下减阻研究[J],2016, 2016.
APA	王宝,汪家道,陈大融,Wang Bao,Wang Jia-Dao,&Chen Da-Rong.(2016).基于微空泡效应的疏水性展向微沟槽表面水下减阻研究..
MLA	王宝,et al."基于微空泡效应的疏水性展向微沟槽表面水下减阻研究".(2016).

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