2019
DOI: 10.1007/s12540-019-00512-y
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Review on the Acoustical Properties and Characterisation Methods of Sound Absorbing Porous Structures: A Focus on Microcellular Structures Made by a Replication Casting Method

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Cited by 33 publications
(35 citation statements)
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“…These findings is in opposite with the previous researches [18,[30][31][32], that an approximate relationship between the thickness, h, and dominant frequency f, is numerically by f 1 ¼ C 4h ; and f 2 ¼ 3C 4h ; for first and second dominant frequency, respectively. C is wave velocity in the medium and h is thickness.…”
Section: Sound Absorption Performancecontrasting
confidence: 99%
“…These findings is in opposite with the previous researches [18,[30][31][32], that an approximate relationship between the thickness, h, and dominant frequency f, is numerically by f 1 ¼ C 4h ; and f 2 ¼ 3C 4h ; for first and second dominant frequency, respectively. C is wave velocity in the medium and h is thickness.…”
Section: Sound Absorption Performancecontrasting
confidence: 99%
“…As the mean pore diameter openings increase, the materials surface area to bulk volume ratio ( σ FB ) progressively decreases and the results are the creation of more permeable structures which invariably provide lesser resistance to the flowing fluid across the interstices of the porous media. More so, an increase in the additional pressure drop was observed with increasing pore‐nonuniformity (increase in dynamic tortuosity) of the porous materials and this confirms the tendency to increase the energy dissipated within the narrow passages due to the frictional contact between the moving fluid and rigid pore walls . However, this was done by a preliminary modeling of the CFD pressure drop across longer and shorter length samples and would require additional experimental analysis to affirm the reliability of this hypothesis.…”
Section: Resultsmentioning
confidence: 70%
“…More so, an increase in the additional pressure drop was observed with increasing pore-nonuniformity (increase in dynamic tortuosity) of the porous materials and this confirms the tendency to increase the energy dissipated within the narrow passages due to the frictional contact between the moving fluid and rigid pore walls. [36][37][38][39] However, this was done by a preliminary modeling of the Note: Y11, Y12, Y13, Y14, and Y15 are symbols for the adapted structures created by removing 1, 2, 3, 4, and 5 voxels from the skeletal phases of the materials, respectively. Dp is the mean pore size (mm), Dw is the mean pore openings (mm), ε is the porosity (%), σ FB is the structure surface area per unit bulk volume (m −1 ), σ FF is the structure surface area per unit structure volume (m −1 ), k 0 is the Darcian permeability (m 2 ).…”
Section: Research Approachmentioning
confidence: 99%
“…Porous metallic structures are widely classified into open‐celled and close‐celled cellular materials with no moving parts (control pore network and distinctive pore volume) resulting in comparatively simple and less frequent maintenance. While the close‐celled cellular structures are cited to offer high resistance to fluid flow due to their low pore volume, 5‐7 the open‐celled cellular structures are characterized by higher open porosity, random topologies with greater accessible surface area per unit volume or specific surface 8‐10 . Typical applications of porous metallic structures are in the fabrication of reactors, heat exchangers, aero‐engine fuel separators, vibrational and emission control in cars, lightweight solar collectors, fuel cells, and biomedical devices 3,4,6 .…”
Section: Introductionmentioning
confidence: 99%
“…Several authors 3‐5,10,12,13,15‐18,22,24 in the field of transport in porous media maintain that the implementation of molecular‐dynamic equations and fundamental flow equations at the pore level is fundamental for a better understanding of the flow dynamics developed across porous media. Analogous research work has seen the utilization of X‐ray micro‐computed tomography (μCT) and virtual packing of structures to accurately represent the pore morphology of porous metallic structures.…”
Section: Introductionmentioning
confidence: 99%