Bubble formation from a submerged orifice in a thin liquid layer: Detachment and bursting

2021 ◽  
Vol 33 (1) ◽  
pp. 013305
Author(s):  
Yujia Zhou ◽  
Bingqiang Ji ◽  
Chenru Zhao ◽  
Hanliang Bo
Keyword(s):  
Liquid Layer ◽  
Bubble Formation ◽  
Thin Liquid Layer ◽  
Submerged Orifice

Microscopic Activation Phenomena in Heterogeneous Nucleation

2003 ◽  
Author(s):  
J. F. Lu ◽  
X. F. Peng
Keyword(s):  
Liquid Layer ◽  
Solid Surface ◽  
Heterogeneous Nucleation ◽  
Bubble Formation ◽  
Ultrathin Film ◽  
Wall Surface ◽  
Bulk Region ◽  
Heating Wall ◽  
Energy Peak ◽  
Energy Property

The energy property in liquid near the wall was theoretically investigated to understand the effects of wall surface on inception process of nucleation or embryo bubble formation in boiling systems. Analyses indicate that the liquid near heating wall has higher pressure than in bulk region owing to existence of strong attractive forces, and this pressure could maintain a stable liquid microlayer and cause a steady energy peak near the wall. So a vapor embryo is likely to occur beyond the stable microlayer instead of exactly at the solid surface. The stable liquid layer may also be the inception structure of the ultrathin film before nucleation occurs. Fluctuations enhance the phenomenon of energy peak until the nucleation occurs, while energy peak promotes nucleation. Employing the concept of energy peak, the inception phenomena of the microlayer and the formation of embryo bubbles near solid surface were described.

Experimental Study of Bubble Behaviour in a Flowing Liquid Layer

2020 ◽  
Author(s):  
Zhengzheng Zhang ◽  
Liangxing Li ◽  
Shuanglei Zhang ◽  
Afnan Saleem
Keyword(s):  
Liquid Layer ◽  
Flow Rate ◽  
Liquid Flow ◽  
Formation Process ◽  
Bubble Formation ◽  
Water Flow Rate ◽  
Nucleation Site ◽  
Flowing Liquid ◽  
Bubble Detachment ◽  
Smooth Channel

Abstract A visualized experimental system is designed and constructed to investigate the bubble dynamic in a flowing liquid layer. Motivated by reducing uncertainties and digging a deep understand on the formation mechanism of boiling bubbles, the bubbles are formed by injecting air through a submerged orifice in our present work, where the influence of thermal physics, nucleation site density and dry spot are stripped. The water flow rate and the air flow rate are in the range of 72–324 ml/min and 0.8–2.0 ml/min, respectively. The bubble formation process in the smooth channel and the rib channel are investigated. The results state that increasing the liquid flow rates lead to the increasing bubble detachment frequency and the decreasing bubble detachment volume. Besides, the larger the liquid flow rate is, the closer the bubble center of mass is to the wall. The rib has a significant influence on the bubble formation process. In the rib channel, it is more difficult for bubbles to detach from the orifice compared that in a smooth channel. Besides, the bubble detachment volume in a rib channel is larger than it in a smooth channel.

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