Influence of sorption on sound propagation in granular activated carbon

Venegas, R; Umnova, O

Abstract

Granular activated carbon (GAC) has numerous applications due to its ability to adsorb and desorb
gas molecules. Recently, it has been shown to exhibit unusually high low frequency sound absorption.
This behavior is determined by both the multi-scale nature of the material, i.e., the existence
of three scales of heterogeneities, and physical processes specific to micro- and nanometer-size
pores, i.e., rarefaction and sorption effects. To account for these processes a model for sound propagation
in GAC is developed in this work. A methodology for characterizing GAC which includes
optical granulometry, flow resistivity measurements, and the derivation of the inner-particle model
parameters from acoustical and non-acoustical measurements is also presented. The model agrees
with measurements of normal incidence surface impedance and sound absorption coefficient on
three different GAC samples.

• Journal Article Type: Article
• Acceptance Date: Jul 1, 2016
• Online Publication Date: Aug 3, 2016
• Publication Date: Aug 3, 2016
• Deposit Date: Nov 2, 2016
• Publicly Available Date: Feb 6, 2017
• Journal: The Journal of the Acoustical Society of America (JASA)
• Print ISSN: 0001-4966
• Electronic ISSN: 1520-8524
• Volume: 140
• Issue: 2
• Pages: 755-766
• DOI: https://doi.org/10.1121/1.4959006
• Publisher URL: http://dx.doi.org/10.1121/1.4959006
• Additional Information: Funders : ORSAS award