scholarly journals Physical modelling and similitude of air bubble entrainment at vertical circular plunging jets

2004 ◽  
Vol 59 (4) ◽  
pp. 747-758 ◽  
Author(s):  
H. Chanson ◽  
S. Aoki ◽  
A. Hoque
Keyword(s):  
Physical Modelling ◽  
Air Bubble ◽  
Bubble Entrainment ◽  
Plunging Jets ◽  
Air Bubble Entrainment

scholarly journals Similitude of Air Entrainment at Vertical Circular Plunging Jets

2002 ◽  
Author(s):  
Hubert Chanson ◽  
Shin-Ichi Aoki ◽  
Ashabul Hoque
Keyword(s):  
Scale Effects ◽  
Air Entrainment ◽  
Air Bubble ◽  
Bubble Dispersion ◽  
Jet Impact ◽  
Scale Models ◽  
Bubble Entrainment ◽  
Plunging Jets ◽  
Air Bubble Entrainment ◽  
Inflow Conditions

Air bubble entrainment at plunging jet takes place when the jet impact velocity exceeds a critical velocity function of the inflow conditions. This study investigates scale effects affecting air entrainment and bubble dispersion at vertical circular plunging jets. Three scale models were used and detailed air-water measurements were performed systematically for identical Froude numbers. The results highlight significant scale effects when We1 < 1E+3 or V1/ur < 10. Bubble chord times were also measured and presented in terms of pseudo-bubble chord length which was found to overestimate real bubble chords by 10 to 30%. The data show pseudo-bubble chord sizes ranging from less than 0.5 mm to more than 10 mm. The average pseudo-chord sizes were between 5 and 7 mm.

scholarly journals F113 Improvement of Hydrofoil Performance on Air Bubble Entrainment for Drag Reduction of Ships

2013 ◽  
Vol 2013.18 (0) ◽  
pp. 187-188
Author(s):  
Ichiro KUMAGAI ◽  
Haruki SAKAMAKI ◽  
Yuji TASAKA ◽  
Yoshihiko OISHI ◽  
Yuichi MURAI
Keyword(s):  
Drag Reduction ◽  
Air Bubble ◽  
Bubble Entrainment ◽  
Air Bubble Entrainment
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