About: Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	A robust procedure to estimate vapor diffusion coefficients from unsteady state measurements is proposed. The permeate flux is measured for a step change in the inlet. The method is based on the interpretation of the normalized permeate flux over time as an integral distribution function. Under the assumption that Fick’s second law is valid, a relation between the first two statistical moments and the diffusion coefficient was found. The resulting expressions are surprisingly short, convenient to use and robust against errors in determining the actual begin time of an experiment. Furthermore, a ratio involving the first two statistical moments yields a constant number. The comparison with the same ratio obtained from experimental data shows whether an unsteady permeation process described above obeys Fick’s second law with constant diffusion coefficient. A robust procedure to estimate vapor diffusion coefficients from unsteady state measurements is proposed. The permeate flux is measured for a step change in the inlet. The method is based on the interpretation of the normalized permeate flux over time as an integral distribution function. Under the assumption that Fick’s second law is valid, a relation between the first two statistical moments and the diffusion coefficient was found. The resulting expressions are surprisingly short, convenient to use and robust against errors in determining the actual begin time of an experiment. Furthermore, a ratio involving the first two statistical moments yields a constant number. The comparison with the same ratio obtained from experimental data shows whether an unsteady permeation process described above obeys Fick’s second law with constant diffusion coefficient. (en)
Title	Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis (en)
skos:prefLabel	Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis (en)
skos:notation	RIV/67985858:_____/13:00391468!RIV14-GA0-67985858
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA104/09/1165)
http://linked.open...iv/cisloPeriodika	15 MAY
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Kudrna, Vladimír Uchytil, Petr Fialová, Kateřina Čermáková, Jiřina
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav chemických procesů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	73569
http://linked.open...ai/riv/idVysledku	RIV/67985858:_____/13:00391468
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	diffusion; membranes; transport processes (en)
http://linked.open.../riv/klicoveSlovo	transport processes membranes diffusion
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[9488AFFD65FB]
http://linked.open...i/riv/nazevZdroje	Journal of Membrane Science
http://linked.open...in/vavai/riv/obor	CI
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Study of polymeric membrane swelling and make use of this efect for increasing its permeability
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	435
http://linked.open...iv/tvurceVysledku	Setničková, Kateřina Uchytil, Petr Řezníčková Čermáková, Jiřina Kudrna, Vladimír
http://linked.open...ain/vavai/riv/wos	000317387400005
issn	0376-7388
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.memsci.2013.01.050

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