Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Najmi, Hussain; El-Tabach, Eddy; Chetehouna, Khaled; Gascoin, Nicolas; Falempin, François

doi:10.1016/j.ijhydene.2015.10.054

Cited by 17 publications

(11 citation statements)

References 43 publications

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“…4. The pressure drop for radial samples was more consistent with Darcy's law, following a linear trend with the increase in velocity, implying that flow was mainly laminar and losses of viscous energy were due to friction between gas layers [31].…”

Section: Flow Regimesupporting

confidence: 52%

“…The pressure drop of a gas flowing through a porous material is described as follows by Forchheimer's equation [31], determined by Darcy's law and Forchheimer's extension:…”

Section: Permeability Measurementsmentioning

confidence: 99%

“…Schematic diagram of the laboratory-made gas permeameter device for the determination of experimental permeability. k 2 , respectively [31], were calculated from these fits and are shown in Table 2. For all bioSiC samples in the axial direction, except for PinebioSiC, k 1 was at the same order of magnitude (10 −11 m 2 ) in contrast to radial samples for which all values were around 10 −12 m 2 , an order of magnitude lower.…”

Section: Gas Permeabilitymentioning

confidence: 99%

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Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

et al. 2016

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Biomorphic SiC is a biotemplated material fabricated by Si melt-infiltration of carbon preforms from wood pyrolysis. In this work, porous bioSiC ceramics from five different wood precursors, with porosities between 45 and 72% were studied for their feasibility in filtering applications. Gas permeability and mechanical stability were investigated as a function of the microstructure of the starting wood precursor. Air-permeation performance at room temperature was measured for a range of flow rates, and the permeability constants were assessed by fitting of Forchheimer's equation to the experimental data. Darcian permeabilities were achieved in the range 10 −11 -10 −12 m 2 , while inertial terms were in the range 10 −7 -10 −8 m, showing a correlation with the average pore size and orientation of the larger channels. Regarding the mechanical stability, maximum compressive strength values were reached in the range of 3-115 MPa. These results improve our understanding of the ways in which the microstructure influences permeability and mechanical robustness, enabling the device requirements to be tailored by selecting the wood precursor. It was also shown that these materials are promising for hot-gas filtering applications.

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Section: Flow Regimesupporting

confidence: 52%

“…The pressure drop of a gas flowing through a porous material is described as follows by Forchheimer's equation [31], determined by Darcy's law and Forchheimer's extension:…”

Section: Permeability Measurementsmentioning

confidence: 99%

Section: Gas Permeabilitymentioning

confidence: 99%

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Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

et al. 2016

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“…The pressure drop generated by air flowing across C WCMs sample was measured with a self-made U-type differential pressure instrument. The air permeability coefficients were obtained according to Darcy’s law and Forchheimer’s extension [ 36 , 37 ]:

where ΔP is the pressure drop (Pa) across the C WCMs sample; L is the thickness (m) of C WCMs sample; η is the dynamic viscosity (Pa·s); k 1 is the Darcian permeability (m 2 ); k 2 is the inertial permeability (m);

is gas density (kg·m −3 ); v is gas flow velocity (m/s), v = Q/A; Q is gas flow (m 3 ·s −1 ); A is the flow area (m 2 ) across the C WCMs sample. For estimating the values of parameters k 1 and k 2 , the second order polynomial with zero constant term was utilized to fit the experimental results of pressure drop and gas flow velocity.…”

Section: Methodsmentioning

confidence: 99%

Effects of Filling Rate and Resin Concentration on Pore Characteristics and Properties of Carbon Based Wood Ceramics

Guo

Gao

et al. 2021

Materials

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As a kind of novel porous ceramics, wood ceramics can be used for filtration, friction, energy storage and electrode materials, etc. In current work, the carbon based wood ceramics (C WCMs) was prepared using pine wood powder and phenolic resin as starting materials. The effects of filling rate of wood powder and resin concentration on pore characteristics and properties of C WCMs were characterized and analyzed with different techniques. Furthermore, the association among porosity of C WCMs, filling rate of wood powder and resin concentration was explored with multiple regression model. The results showed that: increasing the resin concentration and the filling rate of wood powder can improve the mechanical properties of C WCMs, but reduce the porosity and air permeability; when resin concentration is more than 50%, a large amount of caking will appear in the C WCMs, causing internal defects; changing the filling rate under a certain resin concentration can obtain the C WCMs with better pore structure; the porosity of C WCMs has a good linear relationship with resin concentration and filling rate, under the condition that sintering process and the size of wood powder are determined.

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“…31,37 Darcian term is for low velocity regime filtration (Darcian flows) and the Forchheimer term is related to the Stokes's law (non-Darcian flows) which takes into account the inertial effects related with flow resistance. 31,38…”

Section: Permeability Experimentsmentioning

confidence: 99%

Thermal decomposition of multilayer honeycomb core laminate sandwich composite panels in cone calorimeter apparatus – Effect of the top decomposed layer

Najmi

Luche

Rogaume

2021

Journal of Composite Materials

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Multilayer composite materials are frequently used in aircraft interiors. Even though they have high properties (such as physical, chemical and mechanical properties), their application is limited due to lack of knowledge of their decomposition process and on the interaction between different layers in fire. In the present work, two types of composites with 3 and 4 layers are studied. The fire characterization of multilayer composite is studied in 3 different phases using ISO-5660 cone calorimeter at two heat fluxes (35 and 50 kW.m−2). Phase-I mainly concentrates on the decomposition of single layer materials (paint, laminate and honeycomb) while in phase-II and phase-III, different assemblies are formed using a single layer material and studied in the same experimental configuration. In all the three phases, back surface temperatures of the materials or assemblies are measured and analyzed with different gas productions which allow to understand the dynamics of the decomposition process. The finding from the cone calorimeter study suggests that the ignition primarily depends on the top layer behavior of the composite. The permeability analysis on the top layer of the composite confirms that decomposed layer of paint offers more resistance to the volatile gases escaping from the composite. At the end of the study, thermal conductivity is determined and the ignition temperature of both the composite is determined.

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Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Cited by 17 publications

References 43 publications

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

Permeability and mechanical integrity of porous biomorphic SiC ceramics for application as hot-gas filters

Effects of Filling Rate and Resin Concentration on Pore Characteristics and Properties of Carbon Based Wood Ceramics

Thermal decomposition of multilayer honeycomb core laminate sandwich composite panels in cone calorimeter apparatus – Effect of the top decomposed layer

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