Permeability-Porosity Relationship in RTM for Different Fiberglass and Natural Reinforcements

Rodríguez, E.; Giacomelli, F; Vázquez, Analı́a

doi:10.1177/0021998304039269

Cited by 131 publications

(86 citation statements)

References 16 publications

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“…The sediment was composed of organic-poor sand (loss on ignition = 0.67 ± 0.10%, n = 3) with an average particle size of 300 µm and porosity of 0.41 ± 0.03 (n = 3), similar to what was measured for the same location by Quintana et al (2007). Permeability estimated from the Carman-Kozeny equation (Rodriguez et al 2004) was 25.8 D and is therefore considered moderately permeable (Huettel & Gust 1992). The volume-specific sediment O 2 consumption rate (R) was measured to be 0.35 ± 0.06 nmol cm −3 s −1 (n = 4) using homogenized, slurried sediment samples.…”

Section: Samplingsupporting

confidence: 59%

Oxygen dynamics and porewater transport in sediments inhabited by the invasive polychaete Marenzelleria viridis

Jovanovic¹,

Larsen²,

Quintana³

et al. 2014

Mar. Ecol. Prog. Ser.

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The polychaete Marenzelleria viridis is an invasive species and often replaces the native Nereis diversicolor. This shift leads to more reduced conditions and changes in the biogeochemical function of the sediments. By combining imaging techniques for O 2 (planar optodes) and irrigation patterns (rhodamine WT and brilliant blue), we investigated the relationship between irrigation and O 2 dynamics in burrows of M. viridis. The investigated animals shifted between 2 modes of ventilation: ciliary pumping for 77% of the time and muscular pumping for 23% of the time. On average, muscular pumping was induced every 0.4 h. During ciliary pumping, oxic water was pumped into blind-ended burrows and into the surrounding sediment, inducing an upward porewater transport of O 2 -depleted water. This pattern was reversed during muscular pumping. The 2 pumping modes induced oscillating O 2 penetration along the burrow wall and along the primary sediment-water interface. The average net downward irrigation rate, including both pumping modes, amounted to 11.1 × 10 −3 ± 2.4 × 10 −3 ml min −1. The estimated average oxic sediment volume was 2.1 ± 0.5 cm 3 per burrow, and the burrow-specific O 2 consumption was 45.6 ± 18.1 nmol min −1 . M. viridis burrows and the ambient sediment are relatively O 2 depleted, with intensified rates of O 2 consumption, compared to similar-sized native N. diversicolor. The complex O 2 dynamics induced a unique microenvironment that must favor meiofauna and microbial communities that are tolerant to oxic-anoxic oscillations or that have the ability to migrate along with the pulsing oxic-anoxic interface.

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Section: Samplingsupporting

confidence: 59%

Oxygen dynamics and porewater transport in sediments inhabited by the invasive polychaete Marenzelleria viridis

Jovanovic¹,

Larsen²,

Quintana³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…Only in specialized cases, such as the Kozeny equation are the associated coefficients dimensionless. Similar functions to predict permeability having coefficients with dimensions are already present in the literature [Katz and Thompson, 1986;Ahuja et al, 1989;Rodriguez et al, 2004;Costa, 2006].…”

Section: Discussionmentioning

confidence: 52%

Pedotransfer functions for permeability: A computational study at pore scales

Hyman

Smolarkiewicz

Winter

2013

Water Resources Research

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[1] Three phenomenological power law models for the permeability of porous media are derived from computational experiments with flow through explicit pore spaces. The pore spaces are represented by three-dimensional pore networks in 63 virtual porous media along with 15 physical pore networks. The power laws relate permeability to (i) porosity, (ii) squared mean hydraulic radius of pores, and (iii) their product. Their performance is compared to estimates derived via the Kozeny equation, which also uses the product of porosity with squared mean hydraulic pore radius to estimate permeability. The power laws provide tighter estimates than the Kozeny equation even after adjusting for the extra parameter they each require. The best fit is with the power law based on the Kozeny predictor, that is, the product of porosity with the square of mean hydraulic pore radius.Citation: Hyman, J. D., P. K. Smolarkiewicz, and C. L. Winter (2013), Pedotransfer functions for permeability: A computational study at pore scales, Water Resour.

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“…For example, the dimension L could be very small for micro-channels used in microor nano-technology. On the other hand, permeability could be as large as 0.25 × 10 6 m 2 for fiberglass wool (Rodriguez et al 2004).…”

Section: Discussionmentioning

confidence: 99%