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Effect of microbubbles on the structure of turbulence in a turbulent boundary layer
被引：7
作者：
Hiroharu Kato
Tomoaki Iwashina
Masaru Miyanaga
Hajime Yamaguchi
机构：
[1] Department of Mechanical Engineering,
[2] Toyo University,undefined
[3] 2100 Kujirai,undefined
[4] Kawagoe 350-8585,undefined
[5] Japan,undefined
[6] Department of Environmental and Ocean Engineering,undefined
[7] University of Tokyo,undefined
[8] Japan,undefined
关键词：
Key words: microbubble;
bubble;
turbulence;
drag;
frictional resistance;
boundary layer;
D O I：
10.1007/PL00010624
中图分类号：
学科分类号：
摘要：
The time-averaged velocity and turbulence intensity distributions were measured by a laser Doppler velocimeter in a turbulent boundary layer filled with microbubbles. The void fraction distribution was also measured using a fiber-optic probe. The velocity decreased in the region below 100 wall units with an increase in bubble density. This led to a decrease in the velocity gradient at the wall, which was consistent with a decrease in shearing stress on the wall. The turbulence intensity in the buffer layer increased at a low microbubble density, and then began to decrease with an increasing microbubble density. Based on the present measurements, the mechanism of turbulence reduction by microbubbles is discussed and a model is proposed.
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页码：155 / 162
页数：7
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