Very-Low-frequency evanescent liquid pressure waves

Auteurs-es

  • Reinhart Frosch Sommerhaldenstrasse 5B, CH-5200 Brugg, Switzerland

Mots-clés :

Density of liquids, Elastic waves, Waves, Classroom demonstrations, Linear oscillations, Liquid particle, Liquid pressure, Spatial extension, Standing wave, Thermal motion, Very low frequency

Résumé

Evanescent liquid sound-pressure waves are standing waves of limited spatial extension. These waves involve variable pressure and liquid-particle velocity but negligible liquid-density variation: they are predicted to occur also in strictly ideal liquids. The present note is intended to show that classroom demonstrations of these latter waves can provide a plausible introduction to the subject of spring-driven evanescent liquid sound-pressure waves. That inaccuracy occurs because the small- displacement approximation has been used. In both cases, standing waves with linear oscillations of liquid particles along time-independent streamlines are generated. Since thermal motion and diffusion of the molecules are neglected, in the no-wave state the liquid particle is concluded to keep its initial place and shape.

Fichiers supplémentaires

Publié-e

2011-09-01

Comment citer

1.
Frosch R. Very-Low-frequency evanescent liquid pressure waves. Canadian Acoustics [Internet]. 1 sept. 2011 [cité 19 févr. 2025];39(3):120-1. Disponible à: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2440

Numéro

Vol. 39 No. 3 (2011)

Rubrique

Actes du congrès de la Semaine canadienne d'acoustique

Licence

Author Licensing Addendum

This Licensing Addendum ("Addendum") is entered into between the undersigned Author(s) and Canadian Acoustics journal published by the Canadian Acoustical Association (hereinafter referred to as the "Publisher"). The Author(s) and the Publisher agree as follows:

  1. Retained Rights: The Author(s) retain(s) the following rights:

    • The right to reproduce, distribute, and publicly display the Work on the Author's personal website or the website of the Author's institution.
    • The right to use the Work in the Author's teaching activities and presentations.
    • The right to include the Work in a compilation for the Author's personal use, not for sale.

  2. Grant of License: The Author(s) grant(s) to the Publisher a worldwide exclusive license to publish, reproduce, distribute, and display the Work in Canadian Acoustics and any other formats and media deemed appropriate by the Publisher.

  3. Attribution: The Publisher agrees to include proper attribution to the Author(s) in all publications and reproductions of the Work.

  4. No Conflict: This Addendum is intended to be in harmony with, and not in conflict with, the terms and conditions of the original agreement entered into between the Author(s) and the Publisher.

  5. Copyright Clause: Copyright on articles is held by the Author(s). The corresponding Author has the right to grant on behalf of all Authors and does grant on behalf of all Authors, a worldwide exclusive license to the Publisher and its licensees in perpetuity, in all forms, formats, and media (whether known now or created in the future), including but not limited to the rights to publish, reproduce, distribute, display, store, translate, create adaptations, reprints, include within collections, and create summaries, extracts, and/or abstracts of the Contribution.