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Wednesday, July 10 • 15:50 - 16:10
AIRFLOW RESISTIVITY CALCULATION OF COMPRESSED FIBROUS MATERIALS THROUGH INDIRECT DETERMINATION OF AN EQUIVALENT FIBER RADIUS

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Several numerical models exist in the literature to calculate the air flow resistivity of fibrous materials as function of their density. A first category of models is based on empirical relationships obtained as regression fit of experimental data on specific types of fibers; a second category is based on the knowledge of the structure of the fibers, and in particular of their radius and their orientation, and, for real materials, the determination of these parameters can be very complex and difficult to represent with single values or with a statistical distribution. Finally, a third category of models is based on the experimental values measured on a material density and an analytical model that allows to calculate the value for different compression rates. In the present research experimental measurements of air flow resistivity have been carried out on different types of fibrous materials and different compression rates, and various literature formulas have been tested to verify their applicability. In particular, an indirect approach is proposed for the determination of an equivalent fluid-dynamic fiber radius starting from an experimental measurement on a material density, and the subsequent calculation for different degrees of compression of the flow resistivity with the use of well-eastablished models dependent on such parameter. A discussion of the comparisons between experimental data and numerical models will illustrate the advantages and limitations of the proposed approach. Moreover, a critical analysis of the equivalent dynamic radius compared with measured radii distribution using a standard SEM analysis will be presented and discussed.

Moderators
FA

francesco Asdrubali

Full Professor, Università Roma Tre - Department of Engineering
TD

Thomas Dupont

Associate Professor, École de Technologie Supérieure (ÉTS)
PL

Philippe Leclaire

Prof., ISAT - University of Burgundy
avatar for Raymond Panneton

Raymond Panneton

Ing., Ph.D., GAUS, Université de Sherbrooke
Raymond Panneton is a professor-researcher in the Department of Mechanical Engineering at the Université de Sherbrooke since 1998. His research program focuses on the modeling, characterization and optimization of porous acoustic media. More specifically, he explores the relationships... Read More →

Authors

Wednesday July 10, 2019 15:50 - 16:10 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl