The effects of polystyrene beads and nylon fibres on the permeability of compressed wood fibre pads

Chan, Anthony; Pelton, Robert; Zhu, Shiping; Baird, M. H. I.

doi:10.1002/cjce.5450740208

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Such results provide strong support for the general concept. Chan et al (1996) showed that the Kozeny-Carman equations agreed well with experimental results involving mixtures of differently shaped particles, all having roughly the same specific surface area.…”

Section: Introductionsupporting

confidence: 68%

Review of factors affecting the release of water from cellulosic fibers during paper manufacture

2007

BioRes

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The ease with which water is released from cellulosic fiber material during the manufacturing of paper can affect both the production rate and the consumption of energy during the manufacturing process. Important theoretical contributions to dewatering phenomena have been based on flow through packed beds of uniformly distributed fibers. Such descriptions are able to explain why resistance to dewatering increases as a function of the hydrodynamic surface area of fibers. More recent studies have demonstrated a critical role of finely divided matter. If the fines are unattached to fibers, then they tend to move freely through the fiber mat and plug channels in the paper web during the dewatering process. Dewatering also is affected by the deformability of cellulosic fibers and by whether the fibers easily slide past each other, thereby forming a dense mat. By emphasizing the role of fine matter, colloidal forces, and conformability of cellulosic materials, one can gain a more realistic understanding of strategies that papermakers use to enhance initial drainage and vacuum-induced dewatering.

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Section: Introductionsupporting

confidence: 68%

Review of factors affecting the release of water from cellulosic fibers during paper manufacture

2007

BioRes

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“…The fitted values based on Equation (4) matches well with the experiment and follows the Darcy regime of viscous flow [32]. According to Chan et al [33], permeability routinely used in the paper industry is often discussed via the Kozeny-Carman equation using a simple power law model. Sabet uses this model to bring a relationship between permeability and Knudsen number [34] which refers to the ratio of pore size divided by sample thickness.…”

Section: Empirical Expression Of Permeabilitysupporting

confidence: 66%

Air Permeability of Maraging Steel Cellular Parts Made by Selective Laser Melting

Dhinakar

Chang³

et al. 2021

Materials

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Additive manufacturing, such as selective laser melting (SLM), can be used to manufacture cellular parts. In this study, cellular coupons of maraging steels are prepared through SLM by varying hatch distance. Air flow and permeability of porous maraging steel blocks are obtained for samples of different thickness based on the Darcy equation. By reducing hatch distance from 0.75 to 0.4 mm, the permeability decreases from 1.664 × 10−6 mm2 to 0.991 × 10−6 mm2 for 4 mm thick coupons. In addition, by increasing the thickness from 2 to 8 mm, the permeability increases from 0.741 × 10−6 mm2 to 1.345 × 10−6 mm2 at 16.2 J/mm3 energy density and 0.14 MPa inlet pressure. Simulation using ANSYS-Fluent is conducted to observe the pressure difference across the porous coupons and is compared with the experimental results. Surface artifacts and the actual morphology of scan lines can cause the simulated permeability to deviate from the experimental values. The measured permeability of maraging steel coupons is regression fit with both energy density and size of samples which provide a design guideline of porous mold inserts for industry applications such as injection molding.

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Quantitative Estimation of Permeability with Lattice Boltzmann Simulations: Representative Porous Media from Composite Processing

2008

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Understanding of the flow of fluids through beds of fibrous media is extremely important for composites processing. In this work, we have investigated a steady flow of a Newtonian fluid through two‐dimensional porous media using lattice Boltzmann methods. The porous domains studied in this work represent different types of porous media encountered in composite processing. Initially, the methodology was validated with a simulation of flow through random porous media. Flow through porous media with circular and elliptical inclusions was simulated with different geometric arrangements. Simulations were also carried out with anisotropic porous media. The permeability was estimated as a function of porosity, geometric arrangements and the degree of anisotropy. The simulation results agree well with those from analytical, empirical and experimental studies. The results demonstrate that such a method will be very useful in simulating composite processing.

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The effects of polystyrene beads and nylon fibres on the permeability of compressed wood fibre pads

Cited by 3 publications

References 13 publications

Review of factors affecting the release of water from cellulosic fibers during paper manufacture

Review of factors affecting the release of water from cellulosic fibers during paper manufacture

Air Permeability of Maraging Steel Cellular Parts Made by Selective Laser Melting

Quantitative Estimation of Permeability with Lattice Boltzmann Simulations: Representative Porous Media from Composite Processing

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