Regular ArticleParticle Removal By Focused Ultrasound
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Improvement in polishing effect of silicon wafer due to low-amplitude megasonic vibration assisting chemical-mechanical polishing
2019, Journal of Materials Processing TechnologyCitation Excerpt :With the development of ultrasonic applications, the frequency of transducers also increased gradually; to date, the piezoelectric transducers have achieved the working frequency of several megahertz or more. It was reported that the vibrators were designed back in the1990s to generate gigahertz ultrasonic waves (Brereton and Bruno, 1994), but power ultrasonic at this stage mostly adopts the acoustic fields with the frequency between tens of kilohertz and several megahertz. Generally speaking, ultrasonic waves with a frequency of several megahertz or more are called megasonic waves.
Design, fabrication, and testing of surface acoustic wave devices for semiconductor cleaning applications
2016, Microelectronic EngineeringCitation Excerpt :Beyond the streaming-generated shearing forces, other potential removal mechanisms warrant study also. As first pointed out by Brereton and Bruno [18], it is possible that removal of particles may be achieved through the generation of localized pressure gradients for the case of focusing transducers operating near 1 GHz. Fig. 8(b) demonstrates the existence of such a pressure gradient, as derived from FEM results.
Two-stage ultrasonic irradiation for dehydration and desalting of crude oil: A novel method
2014, Chemical Engineering and Processing: Process IntensificationCitation Excerpt :This method was first used in refinery oil dehydration by Yu et al. [1] to remove water in crude oil emulsion, which is mostly made by deliberate injection of water into the crude oil in order to dissolve soluble salts especially NaCl. Their experimental study on the influence of sound field parameters on the water in crude oil emulsion behavior indicated that the efficient response of the dispersed water phase to ultrasonic irradiation to drive, coalesce, and segregate was similar to the behavior of suspended particle [2,3], droplet [4], and bubbles [5,6] in sound field. If highly powered ultrasound is applied to an emulsion at low frequencies (<30 kHz), it can cause to split an emulsion into its component aqueous and oil phases [7,8].
Adhesive particulate flow: The discrete-element method and its application in energy and environmental engineering
2011, Progress in Energy and Combustion ScienceCitation Excerpt :In other situations, ultrasonic acoustic waves can be used to break up particle agglomerates [250]. Acoustic waves focused on a surface can be used to break the adhesive force of adhering dust particles, essentially fluidizing the particles above the surface [251,252]. Acoustic waves in the form of ultrasonic standing waves (e.g., so-called ultrasound traps) are used to produce clusters of cells or colloidal particles [253–256].
Particle behavior on surfaces subjected to external excitations
2000, Journal of Aerosol ScienceScaling-up the Ultrasound-Enhanced Electrospinning Device
2022, IEEE International Ultrasonics Symposium, IUS