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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/41513

Title: Nature of acoustic nonlinear radiation stress
Authors: Rus Carlborg, Guillermo
Issue Date: 2014
Abstract: When a fluid is insonified with ultrasound, a flow consequence of a net stress becomes observable, which has been described as acoustic streaming, quartz wind, acoustic radiation force or acoustic fountain. Following Sir James Lighthill's formulation of the Reynold's streaming, these phenomena have been attributed to a cumulative viscous effect. Instead, a new multiscale effect, whereby the constitutive elastic nonlinearity scales from the ultrasonic to the macroscopic time, is here proposed and formulated to explain its origin. This raises a new term in the Navier-Stokes equation, which ultimately stems from the anharmonicity of the atomic potential. In our experimental validation, this theory is consistent in water and for a range of ultrasonic configurations, whereas the formerly established viscous theory fails by an order of magnitude. This ultrasonic-fluid interaction, called nonlinear mechanical radiation since it is able to remotely exert a stress field, correctly explains a wide range of industrial and biomedical active ultrasonic uses including jet engines, acoustic tweezers, cyanobacteria propulsion mechanisms, nanofluidics or acoustic radiation force elastography.
Sponsorship: Ministerio de Economía y Competitividad (Spain) for Project DPI2010-17065, and Junta de Andalucía for Projects P11-CTS-8089 and GGI3000IDIB.
Publisher: American Institute of Physics (AIP)
Keywords: Acoustic Radiation
Ultrasound
Ultrasonic effects
Sound pressure
Reynolds stress modeling
Velocimetry
Viscosity
URI: http://hdl.handle.net/10481/41513
ISSN: 0003-6951
1077-3118
Citation: Rus Carlborg, G. Nature of acoustic nonlinear radiation stress. Applied Physics Letters, 105(12): 121904 (2014). [http://hdl.handle.net/10481/41513]
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