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Experimental evaluation of green nanofluids in heat exchanger made oF PDMS

2024Journal article Open access
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dc.contributor.authorNobrega, Glauco Tapijara Vallicelli
dc.contributor.authorSouza, Reinaldo Rodrigues de
dc.contributor.authorCardoso, Beatriz D.
dc.contributor.authorAfonso, Inês Santos
dc.contributor.authorPereira, José Eduardo
dc.contributor.authorCardoso, Elaine
dc.contributor.authorMoita, Ana S.
dc.contributor.authorRibeiro, J.E.
dc.contributor.authorLima, Rui A.
dc.date.accessioned2024-11-25T12:49:40Z
dc.date.available2024-11-25T12:49:40Z
dc.date.issued2024
dc.description.abstractConventional methods for synthesizing metallic nanoparticles face challenges such as instability and environmental concerns. Therefore, new, simpler, and more eco-friendly methods are being explored. In this context, the study reports a green synthesis process to produce magnetic iron oxide nanoparticles using an aqueous extract of the alga Chlorella vulgaris. This process leverages natural resources to create a sustainable nanofluid known as green nanofluid. To evaluate the characteristics of this nanofluid, experimental measurements of wettability, viscosity, thermal conductivity, and qualitative stability analysis were conducted. An experimental setup consisting of a heat exchanger made of polydimethylsiloxane (PDMS) was used to assess the thermal performance and the results were compared to theoretical equations and numerical simulation. Additionally, thermographic imaging of temperature gradients as the fluids passed over the heated surface of the serpentine channel were made. The main findings confirmed that the nanofluid was more stable than that obtained by traditional methods and had a more uniform temperature distribution over the heat exchanger. The higher concentration exhibited superior thermal performance compared to DI-Water. Moreover, the green nanofluid was used at a weight concentration of 0.1 wt%, provided thermal performance results of nearly 4.5% superior to those estimated by the numerical model and 6.4% higher than those experimentally obtained with the base fluid, respectively. Finally, the results obtained for the nanofluid also showed an average increase of around 5% in the viscosity of the base fluid, with a more significant sedimentation at a concentration of 0.1 wt%.pt_PT
dc.description.sponsorshipThe authors are grateful to the Fundação para a Ciência e a Tecnologia (FCT), Avenida D. Carlos I, 126, 1249–074 Lisboa, Portugal, for partially financing the Project “Estratégias interfaciais de arrefecimento para tecnologias de conversão com elevadas potências de dissipação”, Ref. PTDC/EMETED/7801/2020). José Pereira also acknowledges FCT for his PhD Fellowship (Ref. 2021.05830.BD). The authors are also grateful for FCT funding through 2022.03151.PTD (https://doi.org/ 10.54499/2022.03151.PTDC), 2022.06207.PTDC (https://doi.org/ 10.54499/2022.06207.PTDC) and LA/P/0083/2020 IN + -IST-ID. The authors also acknowledge the partial financial support within the R&D Units Project Scope: UIDB/04077/2020, UIDP/04077/2020, UIDB/00532/2020, and LA/P/0045/2020 (ALiCE). Glauco Nobrega was supported by the PRT/BD/153088/2021 doctoral grant financed by the Portuguese Foundation for Science and Technology (FCT), and with funds from MCTES/República Portuguesa, under the MIT Portugal Program. A.S. Moita also acknowledges FCT for partially financing her contract through CEECINST/00043/2021/CP2797/CT0005, doi: 10.54499/CEECINST/00043/2021/CP2797/CT0005. The authors are grateful to Professor Andrea Zille for providing materials and equipment and their technical support.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationNobrega, Glauco; Souza, Reinaldo; Cardoso, Beatriz; Afonso, Inês; Pereira, José; Cardoso, Elaine; Moita, Ana; Ribeiro, João; Lima, Rui (2024). Experimental evaluation of green nanofluids in heat exchanger made oF PDMS. Thermal Science and Engineering Progress. ISSN 2451-9049. 55, p. 1-13pt_PT
dc.identifier.doi10.1016/j.tsep.2024.102978pt_PT
dc.identifier.urihttp://hdl.handle.net/10198/30650
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationRevestimentos superhidrofóbicos resistentes à ebulição em meio quiescente
dc.relationLARSyS - Laboratory of Robotics and Engineering Systems
dc.relationMechanical Engineering and Resource Sustainability Center
dc.relationMechanical Engineering and Resource Sustainability Center
dc.relationTransport Phenomena Research Center
dc.relationALICE - Associate Laboratory in Chemical Engineering
dc.relationNot Available
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGreen nanofluidspt_PT
dc.subjectPDMS exchangerpt_PT
dc.subjectThermal conductivitypt_PT
dc.subjectStabilitypt_PT
dc.titleExperimental evaluation of green nanofluids in heat exchanger made oF PDMSpt_PT
dc.typejournal article
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oaire.awardTitleRevestimentos superhidrofóbicos resistentes à ebulição em meio quiescente
oaire.awardTitleLARSyS - Laboratory of Robotics and Engineering Systems
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oaire.citation.endPage13pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleThermal Science and Engineering Progresspt_PT
oaire.citation.volume55pt_PT
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