期刊
ULTRASONICS
卷 44, 期 3, 页码 272-278出版社
ELSEVIER
DOI: 10.1016/j.ultras.2006.02.006
关键词
acoustic streaming; absorption coefficient; bulk viscosity; glycerol-water mixture; magnetic resonance imaging; acoustic field
In this study, magnetic resonance imaging (MRI) is used to visualize acoustic streaming in liquids. A single-shot spin echo sequence (HASTE) with a saturation band perpendicular to the acoustic beam permits the acquisition of an instantaneous image of the flow due to the application of ultrasound. An average acoustic streaming velocity can be estimated from the MR images, from which the ultrasonic absorption coefficient and the bulk viscosity of different glycerol-water mixtures can be deduced. In the same way, this MRI method could be used to assess the acoustic field and time-average power of ultrasonic transducers in water (or other liquids with known physical properties), after calibration of a geometrical parameter that is dependent on the experimental setup. (c) 2006 Elsevier B.V. All rights reserved.
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