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Numerical and Experimental Studies on the Effect of Surface Roughness and Ultrasonic Frequency on Bubble Dynamics in Acoustic Cavitation

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dc.contributor.authorŞİŞMAN, ALPER
dc.contributor.authorsAltay, Rana; Sadaghiani, Abdolali K.; Sevgen, M. Ilker; Şişman, Alper; Koşar, Ali
dc.date.accessioned2022-03-02T05:42:03Z
dc.date.available2022-03-02T05:42:03Z
dc.date.issued2020-03-03
dc.description.abstractWith many emerging applications such as chemical reactions and ultrasound therapy, acoustic cavitation plays a vital role in having improved energy efficiency. For example, acoustic cavitation results in substantial enhancement in the rates of various chemical reactions. In this regard, an applied acoustic field within a medium generates acoustic streaming, where cavitation bubbles appear due to preexisting dissolved gas in the working fluid. Upon cavitation inception, bubbles can undergo subsequent growth and collapse. During the last decade, the studies on the effects of different parameters on acoustic cavitation such as applied ultrasound frequency and power have been conducted. The bubble growth and collapse mechanisms and their distribution within the medium have been classified. Yet, more research is necessary to understand the complex mechanism of multi-bubble behavior under an applied acoustic field. Various parameters affecting acoustic cavitation such as surface roughness of the acoustic generator should be investigated in more detail in this regard. In this study, single bubble lifetime, bubble size and multi-bubble dynamics were investigated by changing the applied ultrasonic field. The effect of surface roughness on bubble dynamics was presented. In the analysis, images from a high-speed camera and fast video recording techniques were used. Numerical simulations were also done to investigate the effect of acoustic field frequency on bubble dynamics. Bubble cluster behavior and required minimum bubble size to be affected by the acoustic field were obtained. Numerical results suggested that bubbles with sizes of 50 µm or more could be aligned according to the radiation potential map, whereas bubbles with sizes smaller than 10 µm were not affected by the acoustic field. Furthermore, it was empirically proven that surface roughness has a significant effect on acoustic cavitation phenomena.
dc.identifier.doi10.3390/en13051126
dc.identifier.issn1996-1073
dc.identifier.issue5
dc.identifier.pages1126
dc.identifier.urihttps://hdl.handle.net/11424/218695
dc.identifier.volume13
dc.language.isoeng
dc.relation.urihttps://www.mdpi.com/1996-1073/13/5/1126
dc.titleNumerical and Experimental Studies on the Effect of Surface Roughness and Ultrasonic Frequency on Bubble Dynamics in Acoustic Cavitation
dc.typearticle
dspace.entity.typePublication
local.avesis.id6e4fe006-02b5-4be5-84f5-3dc34c5e2932
local.indexed.atWOS
local.indexed.atSCOPUS
relation.isAuthorOfPublication26706459-fa25-48f4-8e21-7b1560c9b9d7
relation.isAuthorOfPublication.latestForDiscovery26706459-fa25-48f4-8e21-7b1560c9b9d7

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