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
- 백부근; 임근태; 김광수; 김경열; 김유철
- 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - 선박연구본부 > Naval Ship Engineering Research Center > 1. Journal Articles
- 지능형선박연구본부 > 자율운항선박실증연구센터 > Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.