Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions
The wettability is one of the critical properties of the falling film type absorber, limiting the wetting area in the absorber, hence the total mass transfer performance. To achieve low values of wetting rate in the absorber is an interesting feature to decrease the pumping power and, therefore, the...
| Autores: | , , , , |
|---|---|
| Tipo de documento: | artigo |
| Data de publicação: | 2022 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/372896 |
| Acesso em linha: | https://hdl.handle.net/2117/372896 https://dx.doi.org/10.1016/j.ijrefrig.2022.05.023 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Surfactants Surface tension Moisture Vertical falling film MWR Agents tensioactius Tensió superficial Humitat Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
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Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutionsÉtude de l'influence des tensioactifs et des traitements de surface sur le taux de mouillabilité minimal des films tombants de solutions aqueuses de LiBr et de CarrolZheng, Jian|||0000-0003-0020-5594Castro González, Jesús|||0000-0002-8943-2402García Rivera, EduardoOliet Casasayas, Carles|||0000-0003-2170-5299Oliva Llena, Asensio|||0000-0002-2805-4794SurfactantsSurface tensionMoistureSurface tensionSurfactantsVertical falling filmMWRAgents tensioactiusTensió superficialHumitatÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluidsThe wettability is one of the critical properties of the falling film type absorber, limiting the wetting area in the absorber, hence the total mass transfer performance. To achieve low values of wetting rate in the absorber is an interesting feature to decrease the pumping power and, therefore, the size of the solution pumps. However, studies about the relationship between surface tension, contact angle, and minimum wetting rate are limited. In this work, working pairs LiBr - H2O and Carrol - H2O (Carrol contains LiBr and EG - Ethylene glycol - with a mass ratio at 4.5:1) with additives 2 - EH (2 - Ethyl - 1 - hexanol) and PCM (1 - Phenylethanol) are studied focusing on the surface tension and minimum wetting rate. The surface tension of the two solutions is measured at various temperatures and concentrations employing the Du Rouy method. The experimental results demonstrate the surface tension of both solutions and the effect of liquid/gaseous surfactants on the surface tension is similar. Also, the minimum wetting rate (MWR) is measured in an annular falling film experimental set-up employing the dewetting method using different materials tubes and fluids. The experimental results of MWR test agree with theoretical predictions and empirical correlations with a discrepancy of less than 10%. When the tube is coated with a hydrophilic surface, a contact angle at 30° is achieved, and the minimum mass flow of water to achieve complete wettability on the coated SS tube is reduced from 0.096 to 0.025 kg·m- 1·s- 1.J. Zheng holds a China Scholarship Council Studentship with the Polytechnical University of Catalonia. This work has been financially supported by MCIN/AEI/10.13039/ 501100011033 Spain, project PID2020-115837RBI00. Carles Oliet, as a Serra Hunter lecturer, acknowledges the Catalan Government for the support through this Programme.Peer ReviewedElsevier20222022-09-0120222022-09-16journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/372896https://dx.doi.org/10.1016/j.ijrefrig.2022.05.023reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengAgencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2020-115837RB-I00 DNS Y MODELIZACION MULTI-ESCALA DE FENOMENOS DE TRANSPORTE INTERFACIAL EN FLUJOS DE BURBUJAS Y PELICULAS DESCENDIENTES. APLICACION A SISTEMAS Y EQUIPOS TERMICOSopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3728962026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions Étude de l'influence des tensioactifs et des traitements de surface sur le taux de mouillabilité minimal des films tombants de solutions aqueuses de LiBr et de Carrol |
| title |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| spellingShingle |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions Zheng, Jian|||0000-0003-0020-5594 Surfactants Surface tension Moisture Surface tension Surfactants Vertical falling film MWR Agents tensioactius Tensió superficial Humitat Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| title_short |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| title_full |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| title_fullStr |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| title_full_unstemmed |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| title_sort |
Study of the influence of surfactants and surface treatments on the minimum wetting rate of falling films of aqueous LiBr and Carrol solutions |
| dc.creator.none.fl_str_mv |
Zheng, Jian|||0000-0003-0020-5594 Castro González, Jesús|||0000-0002-8943-2402 García Rivera, Eduardo Oliet Casasayas, Carles|||0000-0003-2170-5299 Oliva Llena, Asensio|||0000-0002-2805-4794 |
| author |
Zheng, Jian|||0000-0003-0020-5594 |
| author_facet |
Zheng, Jian|||0000-0003-0020-5594 Castro González, Jesús|||0000-0002-8943-2402 García Rivera, Eduardo Oliet Casasayas, Carles|||0000-0003-2170-5299 Oliva Llena, Asensio|||0000-0002-2805-4794 |
| author_role |
author |
| author2 |
Castro González, Jesús|||0000-0002-8943-2402 García Rivera, Eduardo Oliet Casasayas, Carles|||0000-0003-2170-5299 Oliva Llena, Asensio|||0000-0002-2805-4794 |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Surfactants Surface tension Moisture Surface tension Surfactants Vertical falling film MWR Agents tensioactius Tensió superficial Humitat Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| topic |
Surfactants Surface tension Moisture Surface tension Surfactants Vertical falling film MWR Agents tensioactius Tensió superficial Humitat Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| description |
The wettability is one of the critical properties of the falling film type absorber, limiting the wetting area in the absorber, hence the total mass transfer performance. To achieve low values of wetting rate in the absorber is an interesting feature to decrease the pumping power and, therefore, the size of the solution pumps. However, studies about the relationship between surface tension, contact angle, and minimum wetting rate are limited. In this work, working pairs LiBr - H2O and Carrol - H2O (Carrol contains LiBr and EG - Ethylene glycol - with a mass ratio at 4.5:1) with additives 2 - EH (2 - Ethyl - 1 - hexanol) and PCM (1 - Phenylethanol) are studied focusing on the surface tension and minimum wetting rate. The surface tension of the two solutions is measured at various temperatures and concentrations employing the Du Rouy method. The experimental results demonstrate the surface tension of both solutions and the effect of liquid/gaseous surfactants on the surface tension is similar. Also, the minimum wetting rate (MWR) is measured in an annular falling film experimental set-up employing the dewetting method using different materials tubes and fluids. The experimental results of MWR test agree with theoretical predictions and empirical correlations with a discrepancy of less than 10%. When the tube is coated with a hydrophilic surface, a contact angle at 30° is achieved, and the minimum mass flow of water to achieve complete wettability on the coated SS tube is reduced from 0.096 to 0.025 kg·m- 1·s- 1. |
| publishDate |
2022 |
| dc.date.none.fl_str_mv |
2022 2022-09-01 2022 2022-09-16 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 AM http://purl.org/coar/version/c_ab4af688f83e57aa |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/372896 https://dx.doi.org/10.1016/j.ijrefrig.2022.05.023 |
| url |
https://hdl.handle.net/2117/372896 https://dx.doi.org/10.1016/j.ijrefrig.2022.05.023 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.relation.none.fl_str_mv |
Agencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020 PID2020-115837RB-I00 DNS Y MODELIZACION MULTI-ESCALA DE FENOMENOS DE TRANSPORTE INTERFACIAL EN FLUJOS DE BURBUJAS Y PELICULAS DESCENDIENTES. APLICACION A SISTEMAS Y EQUIPOS TERMICOS |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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application/pdf |
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Elsevier |
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Elsevier |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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