Experimental analysis of natural convection heat transfer using Al₂O₃ nanofluids for higher thermal efficiency

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dc.contributor.authorSilva, Kaelaine Carvalho da
dc.contributor.authorSato, André Issao
dc.contributor.authorMoura, Flávia Luísa Lima
dc.contributor.authorSantos, Jorge Luis Oliveira
dc.date.accessioned2026-05-20T18:47:37Z
dc.date.available2026-05-20T18:47:37Z
dc.date.issued2026-05-20
dc.descriptionTrabalho de Conclusão de Curso intitulado “Experimental analysis of natural convection heat transfer using Al₂O₃ nanofluids for higher thermal efficiency ” como requisito curricular indispensável para a integralização do Curso de Graduação em Engenharia Mecânica.
dc.description.abstractThe increasing demand for more compact and efficient electronic devices has brought significant challenges in heat dissipation, particularly in natural convection processes. In this context, nanofluids (NFs), composed of base liquids with added nanoparticles, emerge as a promising alternative for improving heat transfer. This work aims to develop an experimental setup to evaluate the thermal performance of distilled water-based nanofluids with alumina nanoparticles (Al₂O₃) at different concentrations (0.01%, 0.03%, 0.10%, and 0.20% by volume). The experimental setup was designed using additive manufacturing and components such as an electrical resistor, a quartz channel, and temperature sensors coupled to an Arduino-based data acquisition system. The nanofluid was prepared using the twostep method, involving nanoparticle synthesis, drying, and ultrasonic dispersion. Results indicated that the 0.03% concentration exhibited the best thermal performance, with an average increase of 35.55% in the heat transfer coefficient (h) compared to distilled water. Concentrations of 0.01% and 0.10% also showed relevant gains. However, at 0.20%, performance degradation was observed due to nanoparticle sedimentation, which compromised colloidal stability and, consequently, thermal efficiency. The study concludes that there is an optimal nanoparticle concentration range to maximize heat transfer, balancing thermal conductivity and nanofluid stability. Higher concentrations, though potentially more conductive, increase viscosity and promote precipitation, limiting thermal gains. For future work, the use of stabilizing agents and detailed rheological analysis is recommended to mitigate sedimentation effects and expand the applicability of nanofluids in natural convection systems.
dc.description.sponsorshipOrinetador: Prof. Dr. André Issao Sato
dc.identifier.citationK. C. da Silva, A. I. Sato and F. L. L. Moura. Experimental analysis of natural convection heat transfer using Al₂O₃ nanofluids for higher thermal efficiency
dc.identifier.urihttps://repositorio.ufob.edu.br/handle/123456789/727
dc.language.isoen
dc.publisherUniversidade Federal do Oeste da Bahia. Centro Multidisciplinar de Bom Jesus da Lapa
dc.titleExperimental analysis of natural convection heat transfer using Al₂O₃ nanofluids for higher thermal efficiency
dc.typeArticle
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