DC FieldValueLanguage
dc.contributor.authorSelmer, Ilka-
dc.contributor.authorBehnecke, Anna Sophia-
dc.contributor.authorQuiño, Jaypee-
dc.contributor.authorBraeuer, Andreas Siegfried-
dc.contributor.authorGurikov, Pavel-
dc.contributor.authorSmirnova, Irina-
dc.date.accessioned2019-04-24T14:49:21Z-
dc.date.available2019-04-24T14:49:21Z-
dc.date.issued2018-10-
dc.identifier.citationJournal of Supercritical Fluids (140): 415-430 (2018-10)de_DE
dc.identifier.issn0896-8446de_DE
dc.identifier.urihttp://hdl.handle.net/11420/2413-
dc.description.abstractA mass transport model for the supercritical drying of gels to aerogels in different sizes (monoliths or particles) and shapes (cylinder, sphere) was developed and evaluated. Physico-chemical data for the system CO2/ethanol from literature at relevant process conditions were analyzed for a precise description of relevant physical properties. In situ measurements of the supercritical drying kinetics of gel monoliths using Raman spectroscopy were used to fit the tortuosity factor of the gel network. Apart from the fitted tortuosity factor the presented model is predictive. The model was analyzed in detail for the case of spherical gel particles. Theoretical minimal drying times were found to range in seconds for microparticles. The mass transfer step limiting the overall drying kinetics was analyzed using the dimensionless Biot number. The transition Biot number can be used for rational selection of the drying conditions (pressure, temperature, mass flow) to achieve a fast drying with low CO2 consumption.en
dc.language.isoende_DE
dc.relation.ispartofThe journal of supercritical fluidsde_DE
dc.titleModel development for sc-drying kinetics of aerogels: Part 1. Monoliths and single particlesde_DE
dc.typeArticlede_DE
dc.type.diniarticle-
dcterms.DCMITypeText-
tuhh.abstract.englishA mass transport model for the supercritical drying of gels to aerogels in different sizes (monoliths or particles) and shapes (cylinder, sphere) was developed and evaluated. Physico-chemical data for the system CO2/ethanol from literature at relevant process conditions were analyzed for a precise description of relevant physical properties. In situ measurements of the supercritical drying kinetics of gel monoliths using Raman spectroscopy were used to fit the tortuosity factor of the gel network. Apart from the fitted tortuosity factor the presented model is predictive. The model was analyzed in detail for the case of spherical gel particles. Theoretical minimal drying times were found to range in seconds for microparticles. The mass transfer step limiting the overall drying kinetics was analyzed using the dimensionless Biot number. The transition Biot number can be used for rational selection of the drying conditions (pressure, temperature, mass flow) to achieve a fast drying with low CO2 consumption.de_DE
tuhh.publisher.doi10.1016/j.supflu.2018.07.002-
tuhh.publication.instituteThermische Verfahrenstechnik V-8de_DE
tuhh.type.opus(wissenschaftlicher) Artikel-
tuhh.institute.germanThermische Verfahrenstechnik V-8de
tuhh.institute.englishThermische Verfahrenstechnik V-8de_DE
tuhh.gvk.hasppnfalse-
dc.type.driverarticle-
dc.type.casraiJournal Article-
tuhh.container.volume140de_DE
tuhh.container.startpage415de_DE
tuhh.container.endpage430de_DE
item.grantfulltextnone-
item.creatorGNDSelmer, Ilka-
item.creatorGNDBehnecke, Anna Sophia-
item.creatorGNDQuiño, Jaypee-
item.creatorGNDBraeuer, Andreas Siegfried-
item.creatorGNDGurikov, Pavel-
item.creatorGNDSmirnova, Irina-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.fulltextNo Fulltext-
item.openairetypeArticle-
item.creatorOrcidSelmer, Ilka-
item.creatorOrcidBehnecke, Anna Sophia-
item.creatorOrcidQuiño, Jaypee-
item.creatorOrcidBraeuer, Andreas Siegfried-
item.creatorOrcidGurikov, Pavel-
item.creatorOrcidSmirnova, Irina-
item.languageiso639-1en-
item.cerifentitytypePublications-
crisitem.author.deptThermische Verfahrenstechnik V-8-
crisitem.author.deptEntwicklung und Modellierung neuartiger nanoporöser Materialien V-EXK2-
crisitem.author.deptThermische Verfahrenstechnik V-8-
crisitem.author.orcid0000-0003-0598-243X-
crisitem.author.orcid0000-0003-4503-4039-
crisitem.author.parentorgStudiendekanat Verfahrenstechnik-
crisitem.author.parentorgStudiendekanat Verfahrenstechnik-
crisitem.author.parentorgStudiendekanat Verfahrenstechnik-
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