Review on the Acoustical Properties and Characterisation Methods of Sound Absorbing Porous Structures: A Focus on Microcellular Structures Made by a Replication Casting Method

Otaru, A.J.

doi:10.1007/s12540-019-00512-y

Cited by 32 publications

(35 citation statements)

References 57 publications

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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%

Palm Oil Clinker as Noise Control Materials

Haron¹,

Ghalip²,

Yahya³

et al. 2022

Elaeis Guineensis

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Palm oil clinker (POC) is a waste from the production process of palm oil, a hard and porous materials. Many studies have focused on the effect of POC use on strength while this study discusses the ability of POC in concrete to absorb sound and its relationship with concrete properties. The study was done by replacing natural river sand in stages of 25, 50, 75 and 100 percent in a mixture of 1: 4 (cement: sand). Sound absorption coefficient (SAC), strength and physical properties affect the SAC were measured. Although POC significantly reduced the compressive strength but all specimens poses good strength more than 5 N/mm2. An interesting result is that POC reduces interconnected porosity and total porosity when replacement is 100% but increases interconnected and total porosity when replacement is between 50 and 75%. SAC at 315 Hz was found has good relationship with percentage of POC and density. It is obtained that POC 50% yield good strength and sufficient SAC that can address the middle frequency range problem, thus can be further suggested to be used for masonry block application for noise control materials.

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Section: Sound Absorption Performancecontrasting

confidence: 99%

Palm Oil Clinker as Noise Control Materials

Haron¹,

Ghalip²,

Yahya³

et al. 2022

Elaeis Guineensis

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“…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%

The permeability of replicated microcellular structures in the Darcy regime

Otaru

2020

AIChE Journal

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This study provides an extension to previously published articles on measurements and computational fluid dynamic (CFD) modeling and simulations of airflow across “bottleneck‐type” structures in the Forchheimer regime to purely inertial‐neglected (Darcy regime) incompressible flowing fluid via tomography datasets. A linear‐dependent relationship between the CFD computed unit pressure drop developed across the samples and the superficial fluid inlet velocity was observed for all the samples for creeping fluid flow (0–7 × 10−03m·s−1). The permeability of the structures was observed to be dependent on the structural parameters of the porous medium and most importantly, its pore diameter openings. Linear graphical relations between permeability and pore‐structure related properties of these materials were observed and these could assist in minimizing the number of design iterations needed for the processing of self‐supporting porous metals.

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“…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%

Computational evaluation of effective transport properties of differential microcellular structures

et al. 2020

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This study presents a combined implementation of three-dimensional (3D) advanced imaging and computational fluid dynamics (CFD) modeling and simulation techniques to interpret the effective transport properties of single and stacked samples of differential microcellular structures. 3D morphological analysis software (ScanIP) was used to create representative elemental volumes via high-resolution tomography data for samples of tetrakaidekahedron-shaped Inconel and bottleneck-type aluminum foams. Pore-structure-related information for single and stacked differential samples were obtained with the aid of image analysis software, while their effective transport properties were attained by computationally resolving the pressure drop developed across these materials for superficial fluid velocities in the range from 0 to 6 m s −1. Model validation was demonstrated by tolerable agreement between resulting CFD predicted results and experimentally measured values of flow properties. With these techniques, contributory effects were identified for pore-structure-related properties, pore density, and flow entrance on the flow dynamics of microcellular structures. This approach could prove useful in the design of highly efficient porous metallic components for applications specific to fluid transport.

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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

Cited by 32 publications

References 57 publications

Palm Oil Clinker as Noise Control Materials

Palm Oil Clinker as Noise Control Materials

The permeability of replicated microcellular structures in the Darcy regime

Computational evaluation of effective transport properties of differential microcellular structures

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