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Título

Airborne ultrasound for the precipitation of smokes and powders and the destruction of foams

AutorGallego Juárez, Juan Antonio; Riera, Enrique; Mason, Timothy J.
Palabras clavePower Ultrasounds
Macrosounds
Fine particle acoustic agglomeration
Cavitation
Acoustic impedance
Acoustic Defoaming
Fecha de publicaciónfeb-2006
EditorElsevier
CitaciónUltrasonics Sonochemistry 13,2: 107–116 (2006).
ResumenSonochemistry is generally associated with the use of power ultrasound in liquid media. Under such circumstances acoustic cavitation can drive a range of reactions and processes. The use of airborne ultrasound in processing is less familiar because of the difficulties that relate to the use of ultrasound in gaseous systems. Firstly there is a greater attenuation (power loss) in the transmission of sound through air compared with that through liquid. Secondly the transfer of acoustic energy generated in air into a liquid or solid material is inefficient due to the mismatch between acoustic impedances of gases and solids or liquids. Despite this, applications do exist for airborne ultrasound but the source must be very powerful and efficient. In this way one can obtain levels of intensities at which it is possible to use ultrasound for specific applications such as to agglomerate fine dusts and to break down foams.
DescripciónFinal full-text version of the paper available at: http://www.sciencedirect.com/science/journal/13504177.
Versión del editorhttp://dx.doi.org/10.1016/j.ultsonch.2005.04.001
URIhttp://hdl.handle.net/10261/6166
DOI10.1016/j.ultsonch.2005.04.001
ISSN1350-4177
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