Hybrid FEM and FDM Approach for Monolithic Catalytic Converters with Pore Diffusion
A transient, three-dimensional model is developed for monolith catalytic converters with washcoat pore diffusion. Due to the unique configuration of monolith converters, the flow within the channel can be considered fully developed laminar flow, and one-dimensional transport equations can be formula...
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Published in | Emission control science and technology (Online) Vol. 6; no. 2; pp. 244 - 253 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Springer International Publishing
01.06.2020
Springer Nature B.V |
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Abstract | A transient, three-dimensional model is developed for monolith catalytic converters with washcoat pore diffusion. Due to the unique configuration of monolith converters, the flow within the channel can be considered fully developed laminar flow, and one-dimensional transport equations can be formulated for the flow and species. On the other hand, a three-dimensional equation is necessary for the monolith solid temperature to capture the effects of significant external heat loss or flow maldistribution. The proposed model employs a three-dimensional finite-element method (FEM) for the solid temperature equation and a one-dimensional finite-difference method (FDM) for the flow and species equations. A recently developed asymptotic approach (Bissett, Emiss. Control Sci. Technol. 1(
1
), 3–16, 2015, Bissett, Emiss. Control Sci. Technol. 5(1), 45–54, 2019) is utilized to solve the washcoat pore diffusion and surface coverages equations. The three-dimensional FEM meshes are chosen so the nodes also serve for the one-dimensional transport equations. All equations are solved fully coupled, without lagging or reliance upon external tools. The developed solver can efficiently simulate general cross-section geometries (circle, oval, rectangle, etc.) for a catalytic monolith under nonuniform inlet distribution and detailed washcoat pore diffusion. The solver is verified by comparing the simulation results to the one-dimensional simulation results for a simple geometry under uniform inlet conditions. The model can be applied to flow through general monolith catalytic reactors with single or dual washcoat layers and a wide range of kinetics. |
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AbstractList | A transient, three-dimensional model is developed for monolith catalytic converters with washcoat pore diffusion. Due to the unique configuration of monolith converters, the flow within the channel can be considered fully developed laminar flow, and one-dimensional transport equations can be formulated for the flow and species. On the other hand, a three-dimensional equation is necessary for the monolith solid temperature to capture the effects of significant external heat loss or flow maldistribution. The proposed model employs a three-dimensional finite-element method (FEM) for the solid temperature equation and a one-dimensional finite-difference method (FDM) for the flow and species equations. A recently developed asymptotic approach (Bissett, Emiss. Control Sci. Technol. 1(1), 3–16, 2015, Bissett, Emiss. Control Sci. Technol. 5(1), 45–54, 2019) is utilized to solve the washcoat pore diffusion and surface coverages equations. The three-dimensional FEM meshes are chosen so the nodes also serve for the one-dimensional transport equations. All equations are solved fully coupled, without lagging or reliance upon external tools. The developed solver can efficiently simulate general cross-section geometries (circle, oval, rectangle, etc.) for a catalytic monolith under nonuniform inlet distribution and detailed washcoat pore diffusion. The solver is verified by comparing the simulation results to the one-dimensional simulation results for a simple geometry under uniform inlet conditions. The model can be applied to flow through general monolith catalytic reactors with single or dual washcoat layers and a wide range of kinetics. A transient, three-dimensional model is developed for monolith catalytic converters with washcoat pore diffusion. Due to the unique configuration of monolith converters, the flow within the channel can be considered fully developed laminar flow, and one-dimensional transport equations can be formulated for the flow and species. On the other hand, a three-dimensional equation is necessary for the monolith solid temperature to capture the effects of significant external heat loss or flow maldistribution. The proposed model employs a three-dimensional finite-element method (FEM) for the solid temperature equation and a one-dimensional finite-difference method (FDM) for the flow and species equations. A recently developed asymptotic approach (Bissett, Emiss. Control Sci. Technol. 1( 1 ), 3–16, 2015, Bissett, Emiss. Control Sci. Technol. 5(1), 45–54, 2019) is utilized to solve the washcoat pore diffusion and surface coverages equations. The three-dimensional FEM meshes are chosen so the nodes also serve for the one-dimensional transport equations. All equations are solved fully coupled, without lagging or reliance upon external tools. The developed solver can efficiently simulate general cross-section geometries (circle, oval, rectangle, etc.) for a catalytic monolith under nonuniform inlet distribution and detailed washcoat pore diffusion. The solver is verified by comparing the simulation results to the one-dimensional simulation results for a simple geometry under uniform inlet conditions. The model can be applied to flow through general monolith catalytic reactors with single or dual washcoat layers and a wide range of kinetics. |
Author | Wahiduzzaman, Syed Bissett, Edward J. Wang, Wen |
Author_xml | – sequence: 1 givenname: Wen orcidid: 0000-0001-9976-4665 surname: Wang fullname: Wang, Wen email: w.wang@gtisoft.com organization: Gamma Technologies – sequence: 2 givenname: Edward J. surname: Bissett fullname: Bissett, Edward J. organization: Gamma Technologies – sequence: 3 givenname: Syed surname: Wahiduzzaman fullname: Wahiduzzaman, Syed organization: Gamma Technologies |
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Keywords | Finite element method Numerical simulation Catalytic converter Pore diffusion Asymptotic Finite difference method |
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References | Tischer, Correa, Deutschmann (CR10) 2001; 69 Colombo, Koltsakis, Nova, Tronconi (CR24) 2012; 188 Bissett (CR14) 2019; 5 CR19 CR18 CR16 CR15 Metkar, Harold, Balakotaiah (CR25) 2013; 87 CR12 Mazumder, Sengupta (CR6) 2002; 131 Sampara, Bissett, Chmielewski (CR20) 2008; 47 Voltz, Morgan, Liederman, Jacob (CR4) 1973; 12 Fletcher (CR17) 1983; 37 Edelbauer, Kutschi, Wurzenberger (CR2) 2012; 5 Štěpánek, Kočí, Marek, Kubíček (CR11) 2012; 188 Kumar, Mazumder (CR5) 2010; 34 Sampara, Bissett, Assanis (CR21) 2008; 63 CR3 Benjamin, Roberts (CR8) 2007; 31 Guojiang, Song (CR7) 2005; 46 Scheuer, Hauptmann, Drochner, Gieshoff, Vogel, Votsmeier (CR22) 2012; 111–112 CR9 CR27 CR26 CR23 Bissett (CR13) 2015; 1 Huang, Chen (CR1) 2004; 40 SF Benjamin (152_CR8) 2007; 31 EJ Bissett (152_CR13) 2015; 1 S Mazumder (152_CR6) 2002; 131 CAJ Fletcher (152_CR17) 1983; 37 S Tischer (152_CR10) 2001; 69 PS Metkar (152_CR25) 2013; 87 A Kumar (152_CR5) 2010; 34 152_CR12 152_CR15 152_CR16 152_CR9 152_CR18 152_CR19 CS Sampara (152_CR21) 2008; 63 M Colombo (152_CR24) 2012; 188 A Scheuer (152_CR22) 2012; 111–112 152_CR3 J Štěpánek (152_CR11) 2012; 188 DT Huang (152_CR1) 2004; 40 152_CR23 CS Sampara (152_CR20) 2008; 47 152_CR26 152_CR27 W Edelbauer (152_CR2) 2012; 5 SE Voltz (152_CR4) 1973; 12 EJ Bissett (152_CR14) 2019; 5 W Guojiang (152_CR7) 2005; 46 |
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SubjectTerms | Asymptotic methods Automotive parts Bad Herrenalb Catalytic converters Computer simulation Diffusion Earth and Environmental Science Earth Sciences Emission control equipment Environmental Science and Engineering Exhaust systems Finite difference method Finite element method Germany Heat loss Industrial Chemistry/Chemical Engineering Kinetics Laminar flow Mathematical models Monolithic materials Reaction kinetics SPECIAL ISSUE: 2019 MODEGAT September 8-10 Surfaces and Interfaces Temperature Thin Films Three dimensional models Transport equations |
Title | Hybrid FEM and FDM Approach for Monolithic Catalytic Converters with Pore Diffusion |
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