scholarly journals Bubble entrainment by a sphere falling through a horizontal soap foam

2020 ◽  
Vol 130 (1) ◽  
pp. 14002
Author(s):  
S. J. Cox ◽  
I. T. Davies
Keyword(s):  
Bubble Entrainment

Cavity and flow measurements of reproducible bubble entrainment following drop impacts

2001 ◽  
Vol 31 (6) ◽  
pp. 664-673 ◽  
Author(s):  
P. A. Elmore ◽  
G. L. Chahine ◽  
H. N. Oguz
Keyword(s):  
Flow Measurements ◽  
Bubble Entrainment ◽  
Drop Impacts

Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Numa Bertola ◽  
Hang Wang ◽  
Hubert Chanson
Keyword(s):  
High Speed ◽  
Point Explosion ◽  
Air Bubble ◽  
Bubble Breakup ◽  
Jet Impact ◽  
Bubble Entrainment ◽  
Bubble Interaction ◽  
Onset Velocity ◽  
Air Cavities ◽  
Interaction Behaviors

The entrainment, breakup, and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities. Ultra-high-speed movies were analyzed both qualitatively and quantitatively. The onset velocity of bubble entrainment was between 0.9 and 1.1 m/s. Most bubbles were entrained as detached bubbles from elongated air cavities at the impingement point. Explosion, stretching, and dejection mechanisms were observed for individual bubble breakup, and the bubble interaction behaviors encompassed bubble rebound, “kiss-and-go,” coalescence and breakup induced by approaching bubble(s). The effects of jet impact velocity on the bubble behaviors were investigated for impact velocities from 1.0 to 1.36 m/s, in the presence of a shear flow environment.

scholarly journals A Study of Bubble Entrainment as Related to Runner Velocity in Aluminum Sand Castings Using the Cosworth Process

2007 ◽  
Vol 539-543 ◽  
pp. 398-403 ◽  
Author(s):  
John C. Burford ◽  
Jerry Sokolowski
Keyword(s):  
Transient Flow ◽  
Metal Flow ◽  
Critical Value ◽  
Low Velocity ◽  
Air Bubble ◽  
Aluminum Castings ◽  
Bubble Entrainment ◽  
Open Production ◽  
Entrained Air ◽  
Flow Experiences

Traditional gravity pour down-sprue methods of filling moulds in the making of aluminum castings inherently lead to oxide and air bubble entrainment. The reason for this is found in the high velocities the metal flow experiences during the filling of a mould. The Nemak Windsor Aluminum Plant (WAP) produces cylinder blocks using the low-pressure Cosworth process, which includes low velocity up-hill filling of the sand mould package. This doctrine is followed in all except one part of the process: the runner system. The nature of the resulting defect is generally known as Head Deck Porosity. Runners were cast full in open production runners at three different velocities with the resulting quickly chilled castings analyzed using X-ray radioscopy, and Scanning Electron Microscopy. Results reveal that the subject bubble porosity is indeed the result of air entrained during initial transient flow within the production runner system whose velocity is higher than the critical value of 0.5ms-1. This theoretical value is corroborated by experimental results. In addition, a new "sessile" runner of optimized shape, filled at a velocity slower than the critical value, is proposed and analyzed using Magmasoft mould fill modelling software. The design can potentially replace the existing runner providing a casting free of entrained air.

scholarly journals Visualization of a bubble entrainment by a drop impingement onto liquid surface

2016 ◽  
Vol 36 (5) ◽  
pp. 24-31
Author(s):  
Hisanobu Kawashima ◽  
Shun Fujishima ◽  
Soichiro Ogawa ◽  
Tsuneaki Ishima
Keyword(s):  
Liquid Surface ◽  
Bubble Entrainment
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