Microstreaming generated by two acoustically induced gas bubbles

2016 ◽  
Vol 796 ◽  
pp. 318-339 ◽  
Author(s):  
Alexander A. Doinikov ◽  
Ayache Bouakaz
Keyword(s):  
Numerical Simulations ◽  
Acoustic Field ◽  
Considerable Increase ◽  
Gas Bubbles ◽  
Stress Fields ◽  
Resonance Frequencies ◽  
Bubble Sizes

A theory is developed that describes microstreaming generated by two interacting gas bubbles in an acoustic field. The theory is used in numerical simulations to compare the characteristics of acoustic microstreaming at different frequencies, separation distances between the bubbles and bubble sizes. It is shown that the interaction of the bubbles leads to a considerable increase in the intensity of the velocity and stress fields of acoustic microstreaming if the bubbles are driven near the resonance frequencies that they have in the presence of each other. Patterns of streamlines for different situations are presented.

Sound propagation in water containing large tethered spherical encapsulated gas bubbles with resonance frequencies in the 50 Hz to 100 Hz range

2011 ◽  
Vol 130 (5) ◽  
pp. 3325-3332 ◽  
Author(s):  
Kevin M. Lee ◽  
Kevin T. Hinojosa ◽  
Mark S. Wochner ◽  
Theodore F. Argo ◽  
Preston S. Wilson ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Gas Bubbles ◽  
Resonance Frequencies

Impact Characteristics of a Carbonated Water Droplet On Hydrophobic Surface

2021 ◽  
Author(s):  
Abba Abdulhamid Abubakar ◽  
Bekir Sami Yilbas ◽  
Hussain Al-Qahtani
Keyword(s):  
Experimental Data ◽  
High Speed ◽  
Gas Bubbles ◽  
Hydrophobic Surface ◽  
Restitution Coefficient ◽  
Droplet Spreading ◽  
Co2 Gas ◽  
Carbonated Water ◽  
Bubble Sizes ◽  
Spreading Rates

Abstract Carbonated water drops impact on a hydrophobic surface is examined. The influence of CO2 gas bubbles in droplet fluid on impacting droplet characteristics, such as spreading rates and restitution coefficient, are explored. The predictions of droplet wetting diameter and spreading rates are validated through the experimental data obtained from high-speed recording. The findings reveal that predictions agree well with the experimental data. CO2 gas bubbles in the droplet are compressed by the total impact pressure of the droplet liquid while slightly reducing the gas bubble sizes. The small size of close by bubbles at high pressure can merge forming large size bubbles, which occur towards the end of droplet spreading and retraction periods. The pressure increase in the fluid gives rise to increased vertical height of the droplet and slightly reduces the droplet contact diameter on the impacted surface. The work done during the compression of CO2 gas in bubbles lowers the restitution coefficient of the droplet after the retraction period.

scholarly journals Ice Flow Over a Bump: Experiment and Numerical Simulations

1989 ◽  
Vol 35 (119) ◽  
pp. 85-97 ◽  
Author(s):  
Jacques Meyssonnier
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Numerical Simulations ◽  
Fixed Time ◽  
Stress Fields ◽  
Steady Creep ◽  
Time Intervals ◽  
Ice Flow ◽  
Flow Law

AbstractThe flow of ice over a bump under steady-state conditions has been studied both experimentally and numerically. The experiments were performed with the ice viscometer installed at the Laboratoire de Glaciologie et Géophysique de l'Environnement du C.N.R.S. (LGGE) in Grenoble, France. The flow was observed by means of a marker network photographed at fixed time intervals. The separation of the ice down-stream of the bump and the non-linearity of the generally accepted Glen’s flow law led to the modelling of this flow using a finite-element method. The results describe the velocity and stress fields in ice moving over a bump and obeying Glen’s flow law (until now only relatively rough approximations of these fields have been given in the literature). The comparison of the observed and calculated network deformations shows that, although ice flowing over a bump does not undergo steady creep, the use of Glen’s flow law with an exponent n = 3 remains justified when simulating the flow of a glacier over its bed under steady-state conditions.

An Investigation of Acoustic Similarity on an Underwater Structure

2011 ◽  
Vol 105-107 ◽  
pp. 84-91
Author(s):  
Yong Fu Wang ◽  
Qi Dou Zhou ◽  
Zhi Yong Xie ◽  
Xiao Jun Lv
Keyword(s):  
Numerical Simulations ◽  
Acoustic Field ◽  
Large Scale ◽  
Acoustic Pressure ◽  
Pressure Coefficient ◽  
Acoustic Similarity ◽  
Acoustic Performance ◽  
Small Structure ◽  
Underwater Structure ◽  
Dimensionless Similarity

An acoustic similarity due to two geometrically similar structures which are vibrating in heavy flow, such as in water, is investigated. The acoustic similarity states that for two geometrically similar structures, if a group of dimensionless similarity numbers are constant, the dimensionless acoustic pressure coefficient keep constant at the corresponding acoustic field points for the two flow–loaded vibrating structure systems. Numerical simulations and experiment results are presented to validate the acoustic similarity. This acoustic similarity may be useful when a small structure is employed to investigate the acoustic performance of large scale structure.

Acoustic behavior of large encapsulated gas bubbles with resonance frequencies in the 50 to 100 Hz range

2010 ◽  
Author(s):  
Mark S. Wochner ◽  
Kevin T. Hinojosa ◽  
Kevin Lee ◽  
Theodore F. Argo IV ◽  
Preston S. Wilson ◽  
...  
Keyword(s):  
Gas Bubbles ◽  
Acoustic Behavior ◽  
Resonance Frequencies
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