Abstract
An experimental study on flow around two similarly-sized, adjacent air bubbles confined in a 1000 mm vertical, square channel (100 × 100 mm2) with downward flow of water was conducted. The bubbles were D = 11.7 mm in major diameter, ellipsoidal in shape (0.4 ml volume) and 12 mm apart. The Reynolds and Eotvos numbers were 1950 < ReD < 2250, 11 < Eo < 11.5 such that the bubbles oscillated. Velocity measurements were taken using Digital Particle Image Velocimetry, complemented by Laser Induced Fluorescence. Simultaneously, a second CCD camera recorded the shadow image of the bubble pair's motions. Visualization revealed that the bubbles move out of phase and do not collide nor coalesce. The velocity data revealed the dynamic interaction of two wake-flow velocity fields with a jet-like flow in-between. From the DPIV data, estimates of the vorticity, Reynolds-stress and turbulent kinetic energy (TKE) distributions confirmed the spatio-temporal nature of the flow. Details will be presented.
| Original language | English |
|---|---|
| Pages (from-to) | 191-197 |
| Number of pages | 7 |
| Journal | Journal of Fluids Engineering, Transactions of the ASME |
| Volume | 121 |
| Issue number | 1 |
| Publication status | Published - 1999 Mar |
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ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering
Cite this
Measurement in the wake region of two bubbles in close proximity by combined shadow-image and PIV techniques. / Tokuhiro, A.; Fujiwara, A.; Hishida, Koichi; Maeda, M.
In: Journal of Fluids Engineering, Transactions of the ASME, Vol. 121, No. 1, 03.1999, p. 191-197.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Measurement in the wake region of two bubbles in close proximity by combined shadow-image and PIV techniques
AU - Tokuhiro, A.
AU - Fujiwara, A.
AU - Hishida, Koichi
AU - Maeda, M.
PY - 1999/3
Y1 - 1999/3
N2 - An experimental study on flow around two similarly-sized, adjacent air bubbles confined in a 1000 mm vertical, square channel (100 × 100 mm2) with downward flow of water was conducted. The bubbles were D = 11.7 mm in major diameter, ellipsoidal in shape (0.4 ml volume) and 12 mm apart. The Reynolds and Eotvos numbers were 1950 < ReD < 2250, 11 < Eo < 11.5 such that the bubbles oscillated. Velocity measurements were taken using Digital Particle Image Velocimetry, complemented by Laser Induced Fluorescence. Simultaneously, a second CCD camera recorded the shadow image of the bubble pair's motions. Visualization revealed that the bubbles move out of phase and do not collide nor coalesce. The velocity data revealed the dynamic interaction of two wake-flow velocity fields with a jet-like flow in-between. From the DPIV data, estimates of the vorticity, Reynolds-stress and turbulent kinetic energy (TKE) distributions confirmed the spatio-temporal nature of the flow. Details will be presented.
AB - An experimental study on flow around two similarly-sized, adjacent air bubbles confined in a 1000 mm vertical, square channel (100 × 100 mm2) with downward flow of water was conducted. The bubbles were D = 11.7 mm in major diameter, ellipsoidal in shape (0.4 ml volume) and 12 mm apart. The Reynolds and Eotvos numbers were 1950 < ReD < 2250, 11 < Eo < 11.5 such that the bubbles oscillated. Velocity measurements were taken using Digital Particle Image Velocimetry, complemented by Laser Induced Fluorescence. Simultaneously, a second CCD camera recorded the shadow image of the bubble pair's motions. Visualization revealed that the bubbles move out of phase and do not collide nor coalesce. The velocity data revealed the dynamic interaction of two wake-flow velocity fields with a jet-like flow in-between. From the DPIV data, estimates of the vorticity, Reynolds-stress and turbulent kinetic energy (TKE) distributions confirmed the spatio-temporal nature of the flow. Details will be presented.
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UR - http://www.scopus.com/inward/citedby.url?scp=0032633461&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0032633461
VL - 121
SP - 191
EP - 197
JO - Journal of Fluids Engineering, Transactions of the ASME
JF - Journal of Fluids Engineering, Transactions of the ASME
SN - 0098-2202
IS - 1
ER -