Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 141, Issue 4, Pages EL363-EL368Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4979682
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- University of Mississippi
- Nanjing University
- Tongji University
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This letter analytically and numerically examines sound transmission through a metasurface of hybrid resonances in the presence of thermoviscous dissipation. The metasurface unit of a subwavelength thickness consists of a slit and series of sided resonators embedded in air. Both wall friction and thermoviscous diffusivity in the unit are taken into account. The results reveal that the dissipation has a weak influence on phases even when there is a large loss. The dissipation reduces the transmission by 28% when the thermoviscous boundary layer thickness is only around 2.3% of the slit width. Optimal designs for minimal dissipation are addressed. (C) 2017 Acoustical Society of America
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