Number of the records: 1
Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis
- 1.
SYSNO ASEP 0391468 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Evaluation of Diffusivity in Dense Polymeric Membranes by Statistical Moment Analysis Author(s) Řezníčková Čermáková, Jiřina (UCHP-M) RID
Kudrna, Vladimír (UCHP-M)
Setničková, Kateřina (UCHP-M) RID, ORCID, SAI
Uchytil, Petr (UCHP-M) RID, SAISource Title Journal of Membrane Science. - : Elsevier - ISSN 0376-7388
Roč. 435, 15 MAY (2013), s. 46-51Number of pages 6 s. Language eng - English Country NL - Netherlands Keywords diffusion ; membranes ; transport processes Subject RIV CI - Industrial Chemistry, Chemical Engineering R&D Projects GA104/09/1165 GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000317387400005 DOI 10.1016/j.memsci.2013.01.050 Annotation 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. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2014
Number of the records: 1