Issue |
EPL
Volume 97, Number 5, March 2012
|
|
---|---|---|
Article Number | 54003 | |
Number of page(s) | 6 | |
Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
DOI | https://doi.org/10.1209/0295-5075/97/54003 | |
Published online | 05 March 2012 |
Radiation torque produced by an arbitrary acoustic wave
1
Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas - Maceió, AL, Brasil 57072-970
2
Los Alamos National Laboratory, Materials Physics and Applications Division, MPA-11, Sensors & Electrochemical Devices, Acoustics & Sensors Technology Team - MS D429, Los Alamos, NM 87545, USA
Received:
16
October
2011
Accepted:
30
January
2012
Acoustic waves may force a suspended object in the wavepath to spin by exerting a radiation torque. Generally, this torque depends on how the incident wave is scattered and absorbed by the object. We derive a general formula for the Cartesian components of the acoustic radiation torque produced by an arbitrary incident beam on an object of any geometrical shape in a nonviscous fluid. To illustrate the method, we calculate the acoustic radiation torque produced by a zero- and a first-order Bessel beam on an absorbing sphere in the off-axis configuration. Unexpectedly, the results show that some radiation torque components reverse their directions depending on the beam offset and the sphere size factor.
PACS: 43.25.Qp – Radiation pressure / 43.20.Fn – Scattering of acoustic waves / 43.55.Ev – Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.