Highly magnifying PTV measurement for drag reducing turbulent structure in a microbubble flow channel

Kanako Suzuki; Kazushi Aoki; Koichi Hishida; Yoshiaki Kodama

doi:10.1299/kikaib.74.1247

Highly magnifying PTV measurement for drag reducing turbulent structure in a microbubble flow channel

Kanako Suzuki, Kazushi Aoki, Koichi Hishida, Yoshiaki Kodama

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The phenomenon of the drag reduction effect with microbubble has been studied experimentally. We revealed the drag reduction effect by using two types of bubbles which are generated in tap water and that with surfactant. We have approached by wall shear stress measurement and flow visualization by using Highly Magnifying PTV with telecentric lens. In both bubble flows, the experiments have been carried out with the Reynolds number ranging from 10 000 to 50 000 and void fraction up to 0.04. In condition of drag reduction effect observed, injecting bubble diameter was 0.6-1.3 mm and the ejection and sweep event were reduced by bubble injection and Reynolds stress was decreased.

Original language	English
Pages (from-to)	1247-1256
Number of pages	10
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	74
Issue number	6
DOIs	https://doi.org/10.1299/kikaib.74.1247
Publication status	Published - 2008 Jun
Externally published	Yes

Keywords

Drag reduction
Micro-bubble
PTV
Reynolds stress
Shear stress
Turbulence

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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10.1299/kikaib.74.1247

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Highly magnifying PTV measurement for drag reducing turbulent structure in a microbubble flow channel. / Suzuki, Kanako; Aoki, Kazushi; Hishida, Koichi et al.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 74, No. 6, 06.2008, p. 1247-1256.

Research output: Contribution to journal › Article › peer-review

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Highly magnifying PTV measurement for drag reducing turbulent structure in a microbubble flow channel

Abstract

Keywords

ASJC Scopus subject areas

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