Mass Transport in Multilayer Porous Metallic Membranes – Diagnosis, Identification and Validation

Edreva, Velislava; Zhang, Fan; Mangold, Michael; Tsotsas, Evangelos

doi:10.1002/ceat.200800448

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…The identification problem of porous membranes becomes even more challenging when composite membranes are considered that consist of several layers with different properties for each layer. This problem is treated in two separate papers from an experimental [24] and a theoretical [25] point of view. …”

Section: Conclusion and Discussionmentioning

confidence: 99%

Optimal Design of Experiments for Parameter Identification of Ceramic Porous Membranes

2009

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Six different experimental schemes for mass transfer through porous membranes are compared for the efficiency with respect to parameter identification, namely dynamic single-gas permeation, dynamic multi-gas permeation, steady state single-gas permeation, steady state multi-gas permeation, transient diffusion and isobaric diffusion experiments. The comparison is made under optimal experimental conditions, which is obtained from optimal experimental design (OED) based on the Fisher information matrix. The covariance matrix of the parameters for each experimental scheme is estimated by the Cramér-Rao lower bound. To solve the optimization problems, a hybrid optimizer which combines a genetic algorithm and a gradient based algorithm is used. Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim [accessed April 22, 2009

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Section: Conclusion and Discussionmentioning

confidence: 99%

Optimal Design of Experiments for Parameter Identification of Ceramic Porous Membranes

2009

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“…In the following we discuss mass transport in ceramic membranes based on results by (Hussain, Seidel -Morgenstern, and Tsotsas, 2006 ) and (Thomas, 2003 ) and mass transport in sinked metall membranes based on results by (Edreva et al , 2009 ). Both types of membranes are porous and asymmetric.…”

Section: Determination Of Transport Coeffi Cients and Validation Of Mmentioning

confidence: 99%

Transport Phenomena in Porous Membranes and Membrane Reactors

et al. 2010

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IntroductionMembrane reactors offer the possibility to integrate dosing, separation and reaction processes in a single apparatus. Their effi cient operation depends on the effectiveness of the catalyst and the corresponding reaction kinetics as well as on the transport processes in the reactor. The diffusive and convective mass and energy transfer can be systematically infl uenced by the reactor geometry, the membrane morphology and the operation conditions. Hence, there is a high optimization potential for these reactors. Due to the large number of parameters, the numerical simulation is increasingly used for reactor sizing and design. The applied models and tools for this purpose are presented in Chapter 2 , where different modeling depths are taken into account. Chapter 3 provides details about the kinetics of an example reaction (oxidative dehydrogenation of ethane), which are necessary for the study of the catalysts, membranes and processes in the framework of this project. The aim of the current chapter is the analysis of the transport phenomena, in particular the superposition of convection and diffusion processes. It focuses on fi xed -bed or packed -bed reactor s ( PBR ), packed -bed membrane reactor s ( PBMR ) and catalytic membrane reactor s ( CMR ), which are investigated numerically by a pseudo -homogeneous model approach. Concerning the superposition of convective and diffusive processes, some aspects of the numerical solution of the corresponding differential equations are discussed from a mathematical point of view in Section 4.2 .The complexity of the simulation model and the numerical effort depend on the model dimension and especially on the manner of description of the velocity profi les. Through meaningful simplifi cations in the modeling, based on a balance between expenses and benefi ts, computing effort can often be signifi cantly reduced. Plug fl ow conditions or developed velocity profi les are frequently used as model assumptions. For example in PBRs, developed velocity profi le can be reliably used for the momentum analysis without great deviation to the full -order model, (Hein, 1999 ), due to the setting of this profi le after a very short entrance length. But, no developed profi le can be obtained in the membrane reactor due to

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On the measurement of transport parameters of porous solids in permeation and Wicke–Kallenbach cells

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Veselý

Hejtmánek

2014

Chemical Engineering Science

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Mass Transport in Multilayer Porous Metallic Membranes – Diagnosis, Identification and Validation

Cited by 3 publications

References 24 publications

Optimal Design of Experiments for Parameter Identification of Ceramic Porous Membranes

Optimal Design of Experiments for Parameter Identification of Ceramic Porous Membranes

Transport Phenomena in Porous Membranes and Membrane Reactors

On the measurement of transport parameters of porous solids in permeation and Wicke–Kallenbach cells

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