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마찰저항 감소에 영향을 주는 난류 경계층 내 미세기포(microbubble)의 가시화 연구Visualization of Microbubbles Affecting Drag Reduction in Turbulent Boundary Layer

Other Titles
Visualization of Microbubbles Affecting Drag Reduction in Turbulent Boundary Layer
Authors
백부근임근태김광수김경열김유철
Issue Date
2015
Publisher
대한조선학회
Keywords
미세기포; 난류 경계층; 마찰 저항; 입자영상유속계; 그림자 기법; Microbubble; Turbulent boundary layer; Skin friction; PIV(particle image velocimetry); Shadowgraphy
Citation
대한조선학회 논문집, v.52, no.4, pp 356 - 363
Pages
8
Journal Title
대한조선학회 논문집
Volume
52
Number
4
Start Page
356
End Page
363
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/791
ISSN
1225-1143
Abstract
Microbubbles moving in the turbulent boundary layer are visualized and investigated in the point of frictional drag reduction. The turbulent boundary layer is formed beneath the surface of the 2-D flat plate located in the tunnel test section. The microbubble generator produces mean bubble diameter of 30 ? 50 μm. To capture the micro-bubbles passing through the tiny measurement area of 5.6 mm2 to 200 mm2, the shadowgraphy system is employed appropriately to illuminate bubbles. The velocity field of bubbles reveals that Reynolds stress is reduced in the boundary layer by microbubbles' activity. To understand the contribution of microbubbles to the drag reduction rate more, much smaller field-of-view is required to visualize the bubble behaviors and to find the 2-D void fraction in the inner boundary layer.
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선박연구본부 > Naval Ship Engineering Research Center > 1. Journal Articles
지능형선박연구본부 > 자율운항선박실증연구센터 > Journal Articles

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지능형선박연구본부 (자율운항선박실증연구센터)
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