scholarly journals Effects of surface tension on the dynamics of a single micro bubble near a rigid wall in an ultrasonic field

2021 ◽  
Vol 78 ◽  
pp. 105735
Author(s):  
Hao Wu ◽  
Hao Zheng ◽  
Yuanyuan Li ◽  
Claus-Dieter Ohl ◽  
Haixia Yu ◽  
...  
Keyword(s):  
Surface Tension ◽  
Rigid Wall ◽  
Ultrasonic Field ◽  
Micro Bubble

Bubble/micro-bubble regime transition in a pressurized bubble column of a low surface tension liquid system

2021 ◽  
pp. 117191
Author(s):  
Keon Bae ◽  
Jun Young Kim ◽  
Kang Seok Go ◽  
Nam Sun Nho ◽  
Dongjae Kim ◽  
...  
Keyword(s):  
Surface Tension ◽  
Bubble Column ◽  
Liquid System ◽  
Regime Transition ◽  
Micro Bubble ◽  
Bubble Regime

Self-Aligned Micro Bubble Arrays by Using Surface Tension

2004 ◽  
Author(s):  
De-Sheng Meng ◽  
Chang-Jin Kim
Keyword(s):  
Surface Tension ◽  
Flat Surface ◽  
Type I ◽  
Type Ii ◽  
Surface Type ◽  
Patterned Surface ◽  
Bubble Trap ◽  
Micro Bubble ◽  
Hydrophobic Patterns ◽  
Theory And Experiments

This paper describes the theory and experiments involve in the capture of bubbles onto a patterned surface. Guided by surface free energy, bubbles can automatically attach to the energetically favorable locations (bubble-traps) and align into bubble arrays. Bubble capturing potential φbc is proposed as the quantity to evaluate the surface’s “affinity” for bubbles. A bubble-trap can therefore be viewed as an area with locally maximum positive φbc. Two types of bubble-traps are proposed and evaluated. Type I bubble-traps are hydrophobic patterns on a hydrophilic flat surface. Type II bubble-traps are concave conic pits surrounded by a hydrophilic flat surface. Simulation of bubble capturing potential φbc explains the bubble-capturing behavior for both cases and predicts a better performance for type II bubble-traps. Experiments agree well with the theoretical prediction and suggest promising applications.

scholarly journals Effect of low-frequency ultrasonic field at different power on the dynamics of a single bubble near a rigid wall

2019 ◽  
Vol 58 ◽  
pp. 104704 ◽  
Author(s):  
Hao Wu ◽  
Cheng Zhou ◽  
Zhihua Pu ◽  
Haixia Yu ◽  
Dachao Li
Keyword(s):  
Low Frequency ◽  
Rigid Wall ◽  
Ultrasonic Field ◽  
Single Bubble

Measurement of Radius Distribution for Micro Bubble Generated in Ultrasonic Field

2003 ◽  
Vol 2003.6 (0) ◽  
pp. 287-288
Author(s):  
Toshinori MAKUTA ◽  
Fumio TAKEMURA ◽  
Eiji HIHARA
Keyword(s):  
Ultrasonic Field ◽  
Micro Bubble

Finite Element Simulations of Gas-Liquid Flows With Surface Tension

2000 ◽  
Author(s):  
Gang Wang
Keyword(s):  
Surface Tension ◽  
Finite Element ◽  
Marangoni Convection ◽  
Surface Force ◽  
Rigid Wall ◽  
Navier Stokes ◽  
Finite Element Program ◽  
Element Program ◽  
Energy Equations ◽  
Liquid Flows

Abstract The finite-element program, ANSYS/FLOTRAN, has been enhanced at Release 5.7 to predict gas-liquid flows with surface tension. The two-dimensional incompressible Navier-Stokes and energy equations are solved in both Cartesian and axisymmetric geometry. The location of the interface is computed and tracked with the CLEAR-VOF algorithm. Normal and tangential boundary conditions at the interface are enforced through a continuum surface force (CSF) model. This new algorithm is first validated with two model problems: a droplet in equilibrium and an oscillating droplet. For the first problem, the computed pressure value is compared with the theoretical value, whereas for the second problem, the oscillation frequency is compared with both the analytical solution and the experimental data. The computer program is then applied to a number of interesting free surface problems: droplet impacting on a rigid wall, binary droplet collision, flow induced by wall adhesion, and marangoni convection in a rectangular cavity.

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