Chemical effects in “hydrodynamic cavitation on a chip”: The role of cavitating flow patterns

Talabazar, Farzad Rokhsar; Aghdam, Araz Sheibani; Jafarpour, Mohammad; Grishenkov, Dmitry; Koşar, Ali; Ghorbani, Morteza

doi:10.1016/j.cej.2022.136734

Cited by 9 publications

(5 citation statements)

References 55 publications

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“…It will hopefully lead to industrial applications of sonochemical reduction as well as oxidation because it is a green process [ 167 , 168 , 169 ]. The same is true for chemical reactions induced by hydrodynamic cavitation (sometimes called fine-bubble technology) [ 170 , 171 , 172 , 173 , 174 ].…”

Section: Results Of Numerical Simulations and Discussionmentioning

confidence: 99%

The Reducing Agents in Sonochemical Reactions without Any Additives

Yasui

2023

Molecules

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It has been experimentally reported that not only oxidation reactions but also reduction reactions occur in aqueous solutions under ultrasound without any additives. According to the numerical simulations of chemical reactions inside an air or argon bubble in water without any additives under ultrasound, reducing agents produced from the bubbles are H, H2, HO2 (which becomes superoxide anion (O2−) in liquid water), NO, and HNO2 (which becomes NO2− in liquid water). In addition, H2O2 sometimes works as a reducing agent. As the reduction potentials of H and H2 (in strongly alkaline solutions for H2) are higher than those of RCHOH radicals, which are usually used to reduce metal ions, H and H2 generated from cavitation bubbles are expected to reduce metal ions to produce metal nanoparticles (in strongly alkaline solutions for H2 to work). It is possible that the superoxide anion (O2−) also plays some role in the sonochemical reduction of some solutes. In strongly alkaline solutions, hydrated electrons (e−aq) formed from H atoms in liquid water may play an important role in the sonochemical reduction of solutes because the reduction potential is extremely high. The influence of ultrasonic frequency on the amount of H atoms produced from a cavitation bubble is also discussed.

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Section: Results Of Numerical Simulations and Discussionmentioning

confidence: 99%

The Reducing Agents in Sonochemical Reactions without Any Additives

Yasui

2023

Molecules

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“…Ultrasound refers to sound waves with frequencies above the audible range, commonly categorized into three regions: the high (2–10 MHz), medium (300–1000 kHz), and low (20–100 kHz). 26 , 27 , 28 , 29 When ultrasound is applied to a liquid medium, it induces various physical, chemical, and mechanical effects, collectively known as acoustic cavitation. Cavitation results in the formation and growth of tiny gas bubbles (i.e., cavities) that, under right conditions, implode releasing the concentrated energy within a very short time to generate localized and transient high temperatures and pressures and leading to the production of an abundance of reactive species, including hydroxyl ( · OH), hydrogen ( · H), and hydroperoxyl radicals ( · OOH).…”

Section: Introductionmentioning

confidence: 99%

Advances in ultrasound-assisted synthesis of photocatalysts and sonophotocatalytic processes: A review

Ahmed,

Mohamed

2024

iScience

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“…This phenomenon has significant advantages besides its destructive effects, such as erosion, high noise, part damage, vibration, and efficiency loss, primarily occurring in engines and pumps. The dynamics of cavitation bubbles are commonly employed in various branches of engineering, including nanomaterials [ 1 , 2 ], chemical [ 3 , 4 ], mechanical [ 5 , 6 ], shipbuilding [ 7 , 8 ], ocean [ 9 , 10 , 11 ], environmental engineering [ 12 ], and important practical issues, such as surface cleaning [ 13 ]. In the medical field, this phenomenon can be used to break up kidney stones [ 14 ], deliver drugs and genes to cells [ 15 ], and treat cancerous tumors [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Laser-Produced Cavitation Bubble Behavior in Newtonian and Non-Newtonian Liquid Inside a Rigid Cylinder: Numerical Study of Liquid Disc Microjet Impact Using OpenFOAM

2023

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This study employs OpenFOAM to analyze the behavior of a single laser-produced cavitation bubble in a Newtonian/non-Newtonian fluid inside a rigid cylinder. This research aimed to numerically calculate the impact of liquid disc microjet resulting from the growth and collapse of the laser-produced bubble to the cylinder wall to take advantage of the cavitation phenomenon in various industrial and medical applications, such as modeling how to remove calcification lesions in coronary arteries. In addition, by introducing the main study cases in which a single bubble with different initial conditions is produced by a laser in the center/off-center of a cylinder with different orientations relative to the horizon, filled with a stationary or moving Newtonian/Non-Newtonian liquid, the general behavior of the bubble in the stages of growth and collapse and the formation of liquid disk microjet and its impact is examined. The study demonstrates that the presence of initial velocity in water affects the amount of microjet impact proportional to the direction of gravity. Moreover, the relationship between the laser energy and the initial conditions of the bubble and the disk microjet impact on the cylinder wall is expressed.

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Chemical effects in “hydrodynamic cavitation on a chip”: The role of cavitating flow patterns

Cited by 9 publications

References 55 publications

The Reducing Agents in Sonochemical Reactions without Any Additives

The Reducing Agents in Sonochemical Reactions without Any Additives

Advances in ultrasound-assisted synthesis of photocatalysts and sonophotocatalytic processes: A review

Laser-Produced Cavitation Bubble Behavior in Newtonian and Non-Newtonian Liquid Inside a Rigid Cylinder: Numerical Study of Liquid Disc Microjet Impact Using OpenFOAM

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