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Effect of boundary slip on the acoustical properties of microfibrous materials

Umnova, O, Tsiklauri, D and Venegas Castillo, RG 2009, 'Effect of boundary slip on the acoustical properties of microfibrous materials' , Journal of the Acoustical Society of America (JASA), 126 (4) , pp. 1850-1861.

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A variety of new porous materials with unusually small pores have been manufactured in the past decades. To predict their acoustical properties, the conventional models need to be modified. When pore size becomes comparable to the molecular mean free path of a saturating fluid, the no-slip conditions on the pore surface are no longer accurate and hence the slip effects have to be taken into account. In this paper, sound propagation in microfibrous materials is modeled analytically, approximating the geometry by a regular array of rigid parallel cylinders. It has been shown that velocity and thermal slip on a cylinder surface significantly changes the model predictions leading to lower attenuation coefficient and higher sound speed values. The influence of material porosity, fiber orientation, and size on these effects is investigated. Finite element method is used to numerically solve the oscillatory flow and heat transfer problems in a square array of cylindrical fibres. Numerical results are compared with predictions of the analytical model and the range of its validity is identified.

Item Type: Article
Themes: Built and Human Environment
Subjects outside of the University Themes
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
Journal or Publication Title: Journal of the Acoustical Society of America (JASA)
Publisher: Acoustical Society of America
Refereed: Yes
ISSN: 0001-4966
Related URLs:
Funders: University of Salford, ORSAS Award
Depositing User: O Umnova
Date Deposited: 13 Feb 2015 11:12
Last Modified: 29 Oct 2015 00:24

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