Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique

Akira Tokuhiro; Munenori Maekawa; Akiko Fujiwara; Koichi Hishida; Masanobu Maeda

Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique

Akira Tokuhiro, Munenori Maekawa, Akiko Fujiwara, Koichi Hishida, Masanobu Maeda

Department of System Design Engineering

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

An experimental study on flow around two similarly sized air bubbles confined in a channel with downward flow of water was conducted. The bubbles were nominally 9.1 mm in diameter and were each attached to two disks (d to approximately 2 mm) suspended across a square channel (100×100 mm²). The disks were 12 mm apart and the bubbles were at the same axial level within the 1000 mm long channel. The flowrate was held constant (Re_Dh = 2.5×10³, based on bubble hydraulic dia.Dh = 11.7 mm). Velocity measurements were made using DPIV and IR shadow imaging in order to detect both the 2D flow-field and the bubbles' shape and gyrating motion respectively. The images revealed that the bubbles move out of phase with respect to each other, but did not collide nor coalesce. Velocity data showed an interaction of two wake-flows with the region in-between characterized by a jet-like accelerated flow. Besides velocity dam, estimates of vorticity and turbulent kinetic energy confirmed the spatio-temporal nature of the flow. Comparisons with a single-bubble data have also been made and will be presented.

Original language	English
Publication status	Published - 1997 Jan 1
Event	Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24) - Vancouver, Can Duration: 1997 Jun 22 → 1997 Jun 26

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Other	Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24)
City	Vancouver, Can
Period	97/6/22 → 97/6/26

ASJC Scopus subject areas

Engineering(all)

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Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique. / Tokuhiro, Akira; Maekawa, Munenori; Fujiwara, Akiko et al.
1997. Paper presented at Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24), Vancouver, Can.

Research output: Contribution to conference › Paper › peer-review

@conference{64015e8e88744cebae0c7a08f49940eb,

title = "Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique",

abstract = "An experimental study on flow around two similarly sized air bubbles confined in a channel with downward flow of water was conducted. The bubbles were nominally 9.1 mm in diameter and were each attached to two disks (d to approximately 2 mm) suspended across a square channel (100×100 mm2). The disks were 12 mm apart and the bubbles were at the same axial level within the 1000 mm long channel. The flowrate was held constant (ReDh = 2.5×103, based on bubble hydraulic dia.Dh = 11.7 mm). Velocity measurements were made using DPIV and IR shadow imaging in order to detect both the 2D flow-field and the bubbles' shape and gyrating motion respectively. The images revealed that the bubbles move out of phase with respect to each other, but did not collide nor coalesce. Velocity data showed an interaction of two wake-flows with the region in-between characterized by a jet-like accelerated flow. Besides velocity dam, estimates of vorticity and turbulent kinetic energy confirmed the spatio-temporal nature of the flow. Comparisons with a single-bubble data have also been made and will be presented.",

author = "Akira Tokuhiro and Munenori Maekawa and Akiko Fujiwara and Koichi Hishida and Masanobu Maeda",

year = "1997",

month = jan,

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note = "Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24) ; Conference date: 22-06-1997 Through 26-06-1997",

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T1 - Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique

AU - Tokuhiro, Akira

AU - Maekawa, Munenori

AU - Fujiwara, Akiko

AU - Hishida, Koichi

AU - Maeda, Masanobu

PY - 1997/1/1

Y1 - 1997/1/1

N2 - An experimental study on flow around two similarly sized air bubbles confined in a channel with downward flow of water was conducted. The bubbles were nominally 9.1 mm in diameter and were each attached to two disks (d to approximately 2 mm) suspended across a square channel (100×100 mm2). The disks were 12 mm apart and the bubbles were at the same axial level within the 1000 mm long channel. The flowrate was held constant (ReDh = 2.5×103, based on bubble hydraulic dia.Dh = 11.7 mm). Velocity measurements were made using DPIV and IR shadow imaging in order to detect both the 2D flow-field and the bubbles' shape and gyrating motion respectively. The images revealed that the bubbles move out of phase with respect to each other, but did not collide nor coalesce. Velocity data showed an interaction of two wake-flows with the region in-between characterized by a jet-like accelerated flow. Besides velocity dam, estimates of vorticity and turbulent kinetic energy confirmed the spatio-temporal nature of the flow. Comparisons with a single-bubble data have also been made and will be presented.

AB - An experimental study on flow around two similarly sized air bubbles confined in a channel with downward flow of water was conducted. The bubbles were nominally 9.1 mm in diameter and were each attached to two disks (d to approximately 2 mm) suspended across a square channel (100×100 mm2). The disks were 12 mm apart and the bubbles were at the same axial level within the 1000 mm long channel. The flowrate was held constant (ReDh = 2.5×103, based on bubble hydraulic dia.Dh = 11.7 mm). Velocity measurements were made using DPIV and IR shadow imaging in order to detect both the 2D flow-field and the bubbles' shape and gyrating motion respectively. The images revealed that the bubbles move out of phase with respect to each other, but did not collide nor coalesce. Velocity data showed an interaction of two wake-flows with the region in-between characterized by a jet-like accelerated flow. Besides velocity dam, estimates of vorticity and turbulent kinetic energy confirmed the spatio-temporal nature of the flow. Comparisons with a single-bubble data have also been made and will be presented.

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M3 - Paper

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T2 - Proceedings of the 1997 ASME Fluids Engineering Division Summer Meeting, FEDSM'97. Part 16 (of 24)

Y2 - 22 June 1997 through 26 June 1997

ER -

Measurements in the wake of two bubbles in close proximity by combined shadow-image and PIV technique

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