Permeability of dual structured hypoeutectic aluminum alloys

Khajeh, Ehsan; Maijer, Daan M.

doi:10.1016/j.actamat.2011.03.074

Cited by 23 publications

(16 citation statements)

References 31 publications

(53 reference statements)

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“…in which π 1 is the Reynolds number showing the ratio of inertia force to viscose force. The Reynolds number plays a key role in flow through a porous media (Khajeh & Maijer, 2011, 2010). Using dimensionless numbers, F 1 was reformed as:…”

Section: Dimensional Analysismentioning

confidence: 99%

Contaminant intrusion in water distribution systems: An ingress model

Mansour-Rezaei

Naser

2013

Journal AWWA

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In a water distribution system, low or negative pressure may occur under normal operation of the system and may lead to contaminant intrusion. To assess the risk associated with contaminant intrusion, exposure assessment is required. To have more accurate intrusion exposure assessment, the effects of the surrounding soil on the intrusion rate must be considered. This research proposes a model to create a more realistic estimation of intrusion rate. A two‐level factorial design was used to screen the effect of pipe internal pressure, soil porosity, average diameter of soil particles, size of the leak point, and pipe burial depth. The Buckingham p theorem was applied to group the influential factors into a set of dimensionless p parameters. The relationship among the p parameters was obtained by using the numerical data generated by a two‐dimensional finite element model for flow in a saturated zone surrounding a pipe. A regression analysis was then applied to find the best fit for the data.

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Section: Dimensional Analysismentioning

confidence: 99%

Contaminant intrusion in water distribution systems: An ingress model

Mansour-Rezaei

Naser

2013

Journal AWWA

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“…Khajeh and Maijer [5] developed an analytical expression for the effective permeability of a dual-structured porous medium. In this work, Porous Medium 1 is a network of impinged spheres with diameters of D 1 and porosity of ε 1 , that is overlaid on Porous Medium 2 which is a network of interwoven bars with porosity of ε 2 and permeability of K 2 .…”

Section: Analytical Expressionmentioning

confidence: 99%

“…(3). Using the predicted pressure drop across the domain and the superficial velocity of the fluid, the permeability was calculated using equation (5) . Fig.…”

Section: Numerical Determination Of Permeabilitymentioning

confidence: 99%

“…In this study, the theoretical expression developed by Khajeh and Maijer [5] will be presented in a more general form. To assess the performance of the expression, the *Address correspondence to this author at the Department of Materials Engineering, The University of British Columbia, 309-6350 Store Road, Vancouver, BC, V6T1Z4, Canada; Tel: +1 (604) 822-6013; Fax: +1 (604) 822-3619; E-mails: ehsan.khajeh@gmail.com, ekhajeh@interchange.ubc.ca effective permeability of example dual-structured porous media consisting of a network of impinged spheres and woven bars is characterized through physical and numerical modeling and compared with predictions from various permeability expressions.…”

Section: Introductionmentioning

confidence: 99%

“…Sano et al, [4] extended Liu et al 's [2] work to calculate the effective permeability of a porous medium with impermeable blocks of different sizes. Khajeh and Maijer [5] developed an analytical expression based on a solution to the Brinkman-Darcy equation for the permeability of solidifying hypoeutectic aluminum alloys by considering the microstructure to be a dual-structured porous medium. The results of this study [5] showed that the expression developed based on solution to the BrinkmanDarcy equation is applicable to non-idealized dual-structured porous media.…”

Section: Introductionmentioning

confidence: 99%

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Permeability of Dual-Structured Porous Media

Khajeh¹

2011

TOTPJ

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Abstract:The effective permeability of dual-structured porous media has been determined through physical and numerical modeling. Example porous media consisting of a woven network of cylindrical bars overlaid by a network of spherical particles have been produced by a rapid prototyping technique. A glycerin-based solution, held in a pressurized reservoir, was forced through the porous samples. The resulting flow rate and pressure drop across the sample were measured and used to determine the permeability of each sample. Mathematical models, considering the continuity and momentum equations, were also developed for the geometries corresponding to the physical models. The results were compared with the analytical expressions of permeability reported by Khajeh and Maijer, Liu et al., and Carman-Kozeny

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