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Flow Visualization in Materials ProcessingBehavior of a Rising Bubble Through an Oil/Water Interface

Flow Visualization in Materials Processing: Behavior of a Rising Bubble Through an Oil/Water... [The mass transfer between immiscible two liquid phases can be greatly accelerated by bubbling gas through a reactor. Therefore, the physical phenomenon occurring during passage of a rising bubble through an immiscible two-liquid interface is of particular interest. The passage of the bubble through the oil (upper phase)/water (lower phase) interface starts with an upward lifting of the interface, and the bubble attracts a column of the water phase upwards keeping a film of the water phase around itself. In this chapter, particular remark is given to the influence of different interface tensions retracting water film, after the water film ruptured, which lays on the interface between air and silicone oil. Unlike the previous studies on the rupture of a single liquid film in a gas which is pulled due to the identical surface tension, this system can form concentric ripples on the outer interface of the water film (oil/water interface) around the bubble due to the weak interface tension. Then, numerous microwater droplets break out from the fully grown ripples. Also, index matching visualization and Computational Fluid Dynamics (CFD) sheds light on the instantaneous behavior on the bubble surface to make clear the still vague phenomenon. Furthermore, this chapter shows an oppositely charged oil/water interface makes more and finer droplets than the original experiment in the absence of the voltage.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Flow Visualization in Materials ProcessingBehavior of a Rising Bubble Through an Oil/Water Interface

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/lp/springer-journals/flow-visualization-in-materials-processing-behavior-of-a-rising-bubble-OwGkGqrUel
Publisher
Springer Japan
Copyright
© Springer Japan KK 2018
ISBN
978-4-431-56565-9
Pages
89 –115
DOI
10.1007/978-4-431-56567-3_5
Publisher site
See Chapter on Publisher Site

Abstract

[The mass transfer between immiscible two liquid phases can be greatly accelerated by bubbling gas through a reactor. Therefore, the physical phenomenon occurring during passage of a rising bubble through an immiscible two-liquid interface is of particular interest. The passage of the bubble through the oil (upper phase)/water (lower phase) interface starts with an upward lifting of the interface, and the bubble attracts a column of the water phase upwards keeping a film of the water phase around itself. In this chapter, particular remark is given to the influence of different interface tensions retracting water film, after the water film ruptured, which lays on the interface between air and silicone oil. Unlike the previous studies on the rupture of a single liquid film in a gas which is pulled due to the identical surface tension, this system can form concentric ripples on the outer interface of the water film (oil/water interface) around the bubble due to the weak interface tension. Then, numerous microwater droplets break out from the fully grown ripples. Also, index matching visualization and Computational Fluid Dynamics (CFD) sheds light on the instantaneous behavior on the bubble surface to make clear the still vague phenomenon. Furthermore, this chapter shows an oppositely charged oil/water interface makes more and finer droplets than the original experiment in the absence of the voltage.]

Published: Oct 6, 2017

Keywords: Bubble Surface; Water Film; Upward Lift; Concentric Ripples; Oppositely Charged

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