Article | REF: AF3812 V1

Acoustics - Propagation in a fluid

Authors: Daniel ROYER, Eugène DIEULESAINT

Publication date: January 10, 2001, Review date: October 21, 2019

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!


Français

5. Attenuation

The fluid studied so far was perfect: it responded instantaneously to any solicitation, whatever its frequency, with no dissipation of energy. Acoustic waves propagate without attenuation. In a real fluid, several mechanisms are responsible for the progressive and irreversible dissipation of part of the acoustic energy into heat:

  • viscosity due to the relative movement of groups of adjacent particles (internal friction) or to fluid friction on walls ;

  • thermal conductivity between compressed parts of the fluid, whose temperature increases, and expanded parts, whose temperature decreases;

  • molecular relaxation, which, in a polyatomic fluid, involves a coupling and therefore an exchange of energy between wave vibrations and the internal movements (translation, vibration, rotation)...

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!


The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors
+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year
From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Noise and vibration

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Attenuation