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

机译:机载超声波,用于烟雾和粉末的沉淀以及泡沫的破坏

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Sonochemistry 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. (c) 2005 Elsevier B.V. All rights reserved.
机译:声化学通常与在液体介质中使用功率超声有关。在这种情况下,空化会导致一系列反应和过程。由于与在气体系统中使用超声波有关的困难,在处理过程中使用航空超声的了解较少。首先,与通过液体的声音传输相比,通过空气的声音传输具有更大的衰减(功率损耗)。其次,由于气体与固体或液体的声阻抗之间的不匹配,在空气中产生的声能向液体或固体材料的传递效率低下。尽管如此,机载超声确实存在应用,但是源必须非常强大和高效。通过这种方式,可以获得强度水平,在该强度水平下,可以将超声用于特定应用,例如凝聚细小的灰尘和分解泡沫。 (c)2005 Elsevier B.V.保留所有权利。

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