Journal article
Coupling of an acoustic wave to shear motion due to viscous heating
Physics of plasmas, Vol.23(7), p.73707
07/2016
DOI: 10.1063/1.4956444
Abstract
Viscous heating due to shear motion in a plasma can result in the excitation of a longitudinal acoustic wave, if the shear motion is modulated in time. The coupling mechanism is a thermal effect: time-dependent shear motion causes viscous heating, which leads to a rarefaction that can couple into a longitudinal wave, such as an acoustic wave. This coupling mechanism is demonstrated in an electrostatic three-dimensional (3D) simulation of a dusty plasma, in which a localized shear flow is initiated as a pulse, resulting in a delayed outward propagation of a longitudinal acoustic wave. This coupling effect can be profound in plasmas that exhibit localized viscous heating, such as the dusty plasma we simulated using parameters typical of the PK-4 experiment. We expect that a similar phenomenon can occur with other kinds of plasma waves.
Details
- Title: Subtitle
- Coupling of an acoustic wave to shear motion due to viscous heating
- Creators
- Bin Liu - University of IowaJ Goree - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Physics of plasmas, Vol.23(7), p.73707
- DOI
- 10.1063/1.4956444
- ISSN
- 1070-664X
- eISSN
- 1089-7674
- Number of pages
- 7
- Grant note
- U.S. Department of Energy (DOE) (http://dx.doi.org/10.13039/100000015) National Aeronautics and Space Administration (NASA) (http://dx.doi.org/10.13039/100000104)
- Language
- English
- Date published
- 07/2016
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984199821702771
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