Solid films and transports in cellular foams

Abstract

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A simplistic unit cell model for sound absorption of cellular foams with fully/semi-open cells

“…Studies on the SAC of open-cell foam-type porous media have been carried out numerically [2,3], experimentally [4e9] and analytically [10e14]. Directly determination of the SAC via experimental measurement is very important and can provide benchmark for validations of numerical or theoretical models.…”

An Overview of Microstructural Approaches for Modelling and Improving Sound Proofing Properties of Cellular Foams: Developments and Prospects

“…The objective of this work was to improve the BiotAllard parameters of a so called standard soft foam by changing only one parameter at a time and by computing the corresponding Transmission Loss with the FTMM (Finite Transfer Matrix Method) simulation [33]. Then the microstructure of the foam corresponding to improved parameters could be determined by using a hybrid numerical approach [16] revealing an admissible morphological path. This latter method allowed defining a better foam microstructure but is not necessarily an optimal due to the low number of investigated cases.…”

“…Thus, research activity in this area may reflect specific attention for a particular shape, from purely open cells [15] to situations where a variable closure rate of membranes was employed to reveal those microphysical effects associated with transport phenomena [16] and linear elasticity [3]. The link between micro and macro scales is provided by the theoretical results obtained from the homogenization of periodic structures' technique; indicating the boundary value problems to be solved at micro-scale, the structure of governing equations at macro-scale, and how the associated coefficients should be computed (macroscopic properties) [17]- [19].…”

An advanced approach for the generation of complex cellular material representative volume elements using distance fields and level sets

“…partially reticulated ), with highly variable pore throat sizes, resulting in highly variable strut sizes and shapes [ 6,54 ]. The throat size or the closed face rate in partially reticulated PU foams have been reported to have an important effect on the acoustic behavior of such foams either experimentally [ 7 ] or with the help of numerical simulations [ 28,32 ]. These latter numerical studies used a Kelvin unit cell as geometrical model, with variable thickness cylindrical struts and planar membrane with circular holes.…”