Accession Number:

ADA214648

Title:

Sound Absorption in Dilute Chemically Reacting Systems

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1981-01-01

Pagination or Media Count:

54.0

Abstract:

A systematic theoretical development is presented for sound absorption in dilute chemically reacting systems when heat effects and other dissipative mechanisms, e.g. diffusion and viscous damping, are ignored. A derivation is presented for the isothermal frequency dependent compressibility for such a system and the relation of this quantity to sound attenuation and the sound absorption spectrum. The method is applied to several illustrative reaction mechanisms of interest. Particular attention is placed on the simplifications that arise when there is a single slow step in the reaction mechanism. The general case of coupled chemical reactions is treated and a prescription presented for determining the sound absorption coefficient. The final section is concerned with sound absorption from chemical systems in steady states far from chemical equilibrium. For such systems the possibility exists that composition fluctuations will behave as chemical waves which will be exhibited by a distinctive splitting in the sound absorption spectrum.

Subject Categories:

  • Physical Chemistry
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE