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On capillary viscosity measurements: how far do surface tension effects go?

2023-05-26Conference object Open access
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datacite.subject.sdg07:Energias Renováveis e Acessíveispt_PT
dc.contributor.authorSequeira, Maria Carolina
dc.contributor.authorCaetano, Fernando J. P.
dc.contributor.authorDiogo, Herminio
dc.contributor.authorFareleira, João M. N. A.
dc.contributor.authorSantos, Fernando J. V.
dc.contributor.authorSerro, A. P.
dc.date.accessioned2024-01-05T18:58:23Z
dc.date.available2024-01-05T18:58:23Z
dc.date.issued2023-05-26
dc.description.abstractViscosity is a fundamental thermophysical property of liquids making it very important particularly in the industry. Capillary viscometers have been widely used for viscosity measurements in different applications, the most relevant being the definition of viscosity standards, traceable to the primary water viscosity standard, by metrological institutions and industrial applications, mostly for quality control. Practical viscometry is based on the internationally accepted primary standard value for the kinematic viscosity of water at 20ºC and atmospheric pressure, which has been measured using capillary viscometers [1]. However, due to the water surface tension, viscosity measurements which have been related to water as a primary standard, can be significantly affected. It is difficult to rigorously assess the surface tension effects on capillary viscometers, and the practical way to avoid this problem is to use long capillaries, which are not appropriate for routine measurements [1-3]. After several experimental studies, using different types of viscometers, the usual procedure to correct surface tension effects in capillary viscosity measurements adopted by different authors, is to employ an empirical expression [1-4]. Additionally, other types of problems exist as the need to perform a kinetic energy correction which must also be taken into consideration [1]. The main goal of this work was to perform the calibration of a suspended-level, or Ubbelohde, capillary viscometer, which is not a long capillary viscometer, as well as the study of corrections to be used for the measurements performed with it. The experimental work covers the calibration of that Ubbelohde capillary viscometer, the evaluation of the uncertainty of the corresponding viscometer constant and the overall uncertainty of the measurements performed with it. This study includes the evaluation of the necessary corrections for kinetic energy and surface tension effects and, finally, the analysis of the case of a set of measurements performed with n-tetradecane. The ultimate purpose of this work is to obtain the lowest uncertainty for the Ubbelohde capillary viscometer 541 01/Ia, and to understand the need for the corrections that must be considered when using capillary viscometers and how they should be applied.pt_PT
dc.description.versionN/Apt_PT
dc.identifier.citationMaria C. M. Sequeira, Fernando J. P. Caetano, Hermínio A. P. Diogo, João M. N. A. Fareleira, Fernando J.V. Santos, Ana P. Serro, On Capillary Viscosity Measurements: How Far do Surface Tension Effects go?, CQE Days 2023, 25-26 May, Lisbon, Portugalpt_PT
dc.identifier.urihttp://hdl.handle.net/10400.2/15356
dc.language.isoengpt_PT
dc.peerreviewednopt_PT
dc.publisherCentro de Química Estrutural, Institute of Molecular Sciencespt_PT
dc.relationCentro de Química Estrutural
dc.relationCentro de Química Estrutural
dc.relationInstitute of Molecular Sciences
dc.relationEquilibrium and Transport Properties of Materials for Sustainable Low Temperature Energy Storage
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/pt_PT
dc.subjectSurface tensionpt_PT
dc.subjectCappilary viscometerpt_PT
dc.subjectViscositypt_PT
dc.subjectDensitypt_PT
dc.titleOn capillary viscosity measurements: how far do surface tension effects go?pt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleCentro de Química Estrutural
oaire.awardTitleCentro de Química Estrutural
oaire.awardTitleInstitute of Molecular Sciences
oaire.awardTitleEquilibrium and Transport Properties of Materials for Sustainable Low Temperature Energy Storage
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00100%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0056%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/UI%2FBD%2F152239%2F2021/PT
oaire.citation.conferencePlaceLisbon, Portugalpt_PT
oaire.citation.titleCQEpt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamOE
person.familyNameSequeira
person.familyNameCaetano
person.familyNameDiogo
person.familyNameFareleira
person.familyNameSantos
person.familyNameValagão Amadeu do Serro
person.givenNameMaria Carolina
person.givenNameFernando J. P.
person.givenNameHerminio
person.givenNameJoão
person.givenNameFernando
person.givenNameAna Paula
person.identifierH-7797-2012
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person.identifier.orcid0000-0002-9746-2281
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person.identifier.orcid0000-0002-0808-1306
person.identifier.orcid0000-0002-8442-9386
person.identifier.orcid0000-0002-4555-8273
person.identifier.orcid0000-0002-6179-9296
person.identifier.ridH-8246-2012
person.identifier.ridH-8325-2012
person.identifier.ridA-5699-2008
person.identifier.scopus-author-id57209026585
person.identifier.scopus-author-id7004474824
person.identifier.scopus-author-id6603795027
person.identifier.scopus-author-id6603840268
person.identifier.scopus-author-id26432136700
person.identifier.scopus-author-id6603259828
project.funder.identifierhttp://doi.org/10.13039/501100001871
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project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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