Experimental Demonstration of Entrance/Exit Effects on the Permeability Measurements of Porous Materials

Baril, Éric; Mostafid, Ali M; Lefebvre, Louis‐Philippe; Medraj, Mamoun

doi:10.1002/adem.200800142

Cited by 45 publications

(42 citation statements)

References 11 publications

(17 reference statements)

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“…Entrance and exit effects were observed in pressure drop measurements performed on several commercial open-cell metal foams by Baril et al (2008). Results showed the pressure gradient to be dependent on the sample thickness in the direction of flow.…”

Section: Introductionmentioning

confidence: 97%

Pore-Scale Numerical Investigation of Pressure Drop Behaviour Across Open-Cell Metal Foams

et al. 2017

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The development and validation of a grid-based pore-scale numerical modelling methodology applied to five different commercial metal foam samples is described. The 3-D digital representation of the foam geometry was obtained by the use of X-ray microcomputer tomography scans, and macroscopic properties such as porosity, specific surface and pore size distribution are directly calculated from tomographic data. Pressure drop measurements were performed on all the samples under a wide range of flow velocities, with focus on the turbulent flow regime. Airflow pore-scale simulations were carried out solving the continuity and Navier-Stokes equations using a commercial finite volume code. The feasibility of using Reynolds-averaged Navier-Stokes models to account for the turbulence within the pore space was evaluated. Macroscopic transport quantities are calculated from the pore-scale simulations by averaging. Permeability and Forchheimer coefficient values are obtained from the pressure gradient data for both experiments and simulations and used for validation. Results have shown that viscous losses are practically negligible under the conditions investigated and pressure losses are dominated by inertial effects. Simulations performed on samples with varying thickness in the flow direction showed the pressure gradient to be affected by the sample thickness. However, as the thickness increased, the pressure gradient tended towards an asymptotic value.

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Section: Introductionmentioning

confidence: 97%

Pore-Scale Numerical Investigation of Pressure Drop Behaviour Across Open-Cell Metal Foams

et al. 2017

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“…This "critical thickness" has been reported in several other studies and is a function of the pore size. Typically, thickness-independent behaviour is observed in the laminar flow region for flow distances exceeding 40-50 pore diameters [3,9].…”

Section: Length-normalised Pressure Drop and Regime Changementioning

confidence: 99%

“…The pressure-drop across monolithic (bulk) porous metals has been widely investigated, including studies reported in [1][2][3][4][5][6]. In many engineering systems, for low (laminar) flow velocities, the relationship between pressure-drop and airflow velocity is ably described by the Hazen-Darcy or Forchheimer equation [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Among these limited studies it has been shown [3,2] that there is an increase (of up to 33% [3]) in the pressure drop when stacking multiple foam discs, compared with a single disc of the same total thickness. This increase was attributed to the effect of the misalignment and discontinuity in the structure where pores in the different discs might not align, with some pores facing ligaments and solid surfaces [2].…”

Section: Introductionmentioning

confidence: 99%

“…In many engineering systems, for low (laminar) flow velocities, the relationship between pressure-drop and airflow velocity is ably described by the Hazen-Darcy or Forchheimer equation [3,7,8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tailoring the pressure-drop in multi-layered open-cell porous inconel structures

Oun

Kennedy

2015

J Porous Mater

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An image-based methodology to establish correlations between porosity and cutting force in micromilling of porous titanium foams

Fakhri

Bordatchev

Tutunea‐Fatan

2011

Int J Adv Manuf Technol

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Porous titanium foam is now a standard material for various dental and orthopedic applications due to its light weight, high strength, and full biocompatibility properties. In practical biomedical applications, outer surface geometry and porosity topology significantly influence the adherence between implant and neighboring bone. New microfabrication technologies, such as micromilling and laser micromachining opened new technological possibilities for shape generation of this class of products. Besides typical geometric alterations, these manufacturing techniques enable a better control of the surface roughness that in turn affects to a large extent the friction between implant and surrounding bone tissue. This paper proposes an image analysis approach for optical investigation of the porosity that is tailored to the specifics of micromilling process, with emphasis on cutting force monitoring. According to this method, the area of porous material removed during micromilling operation is estimated from optical images of the micromachined surface, and then the percentage of solid material cut is calculated for each tool revolution. The employment of the aforementioned methodology in micromilling of the porous titanium foams revealed reasonable statistical correlations between porosity and cutting forces, especially when they were characterized by low-frequency variations. The developed procedure unlocks new opportunities in optimization of the implant surface micro-geometry, to be characterized by an increased roughness with minimal porosity closures in an attempt to maximize implant fixation through an appropriate level of bone ingrowth.

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Experimental Demonstration of Entrance/Exit Effects on the Permeability Measurements of Porous Materials

Cited by 45 publications

References 11 publications

Pore-Scale Numerical Investigation of Pressure Drop Behaviour Across Open-Cell Metal Foams

Pore-Scale Numerical Investigation of Pressure Drop Behaviour Across Open-Cell Metal Foams

Tailoring the pressure-drop in multi-layered open-cell porous inconel structures

An image-based methodology to establish correlations between porosity and cutting force in micromilling of porous titanium foams

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