Evaluation of Acoustic Excitation on the Stability and Thermal Performance of Nanofluids

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dc.creatorAlcalde Castro, Juan José
dc.creatorÁlvarez Gil, Laura Carolina
dc.creatorRestrepo-Martínez, Alejandro
dc.date2026-02-16
dc.descriptionNanofluids with magnetic nanoparticles have been proposed to enhance heat transfer and energy conversion. However, the performance of these fluids depends on suspension stability and thermal distribution under irradiation. Low-frequency acoustic excitation emerges as an active strategy to modulate mixing and heat transport in these systems. The objective of this research was to determine the effect of low-frequency acoustic excitation on suspension stability, radiative absorption, and thermal efficiency of nanofluids containing magnetite nanoparticles (Fe₃O₄) dispersed at 0.05, 0.25, and 0.5% v/v in an ethylene glycol–water mixture. The methodology included exposing the nanofluids to acoustic waves generated by a loudspeaker while irradiating them with visible and infrared light from a halogen lamp. Stability was assessed through transmittance measurements, and thermal evolution and energy conversion were characterized using the specific absorption rate (SAR) and the stored energy ratio (SER). A comparison was made between different nanoparticle concentrations and excitation conditions. The results demonstrated that acoustic excitation influenced the stability and thermal distribution of the fluid. The extent of these effects varied depending on concentration and experimental conditions. In particular, excitation reduced thermal stratification and increased homogenization in certain cases, whereas in others it did not yield significant improvements in thermal efficiency (SAR/SER). Finally, it is concluded that when used in conjunction with an acoustic excitation system, nanofluids can be utilized more effectively in thermal applications because the acoustic excitation system promotes more uniform temperature fields.en-US
dc.descriptionLos nanofluidos con nanopartículas magnéticas se han propuesto para mejorar la transferencia de calor y la conversión energética; sin embargo, su desempeño depende de la estabilidad de la suspensión y de la distribución térmica bajo irradiación. La excitación acústica de baja frecuencia se perfila como una estrategia activa para modular la mezcla y el transporte de calor en estos sistemas. El objetivo de esta investigación fue determinar el efecto de una excitación acústica de baja frecuencia sobre la estabilidad de la suspensión, la absorción radiactiva y la eficiencia térmica de nanofluidos con nanopartículas de magnetita (Fe₃O₄) dispersas a 0,05; 0,25 y 0,5 % v/v en una mezcla de etilenglicol y agua. La metodología empleada consistió en exponer los nanofluidos a ondas acústicas generadas por un altavoz mientras se irradiaban con luz visible e infrarroja de una lámpara halógena. La estabilidad se evaluó mediante medidas de transmitancia, y la evolución térmica y la conversión de energía se caracterizaron mediante la tasa de absorción específica (SAR) y la razón de energía almacenada (SER). Se compararon las distintas concentraciones de nanopartículas y las condiciones experimentales de excitación. Los resultados mostraron que la excitación acústica modificó la estabilidad y la distribución térmica del fluido, y la magnitud de los efectos dependió de la concentración y del régimen experimental. En particular, la excitación redujo la estratificación térmica e incrementó la homogeneización en ciertos casos, mientras que en otros no produjo mejoras significativas en la eficiencia térmica (SAR/SER). Finalmente, se concluye que la incorporación de un sistema de excitación acústica puede optimizar el desempeño de los nanofluidos en aplicaciones térmicas al favorecer campos de temperatura más uniformes.es-ES
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dc.identifierhttps://revistas.itm.edu.co/index.php/tecnologicas/article/view/3450
dc.identifier10.22430/22565337.3450
dc.languageeng
dc.publisherInstituto Tecnológico Metropolitano (ITM)en-US
dc.relationhttps://revistas.itm.edu.co/index.php/tecnologicas/article/view/3450/3945
dc.relationhttps://revistas.itm.edu.co/index.php/tecnologicas/article/view/3450/4104
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dc.rightsCopyright (c) 2026 TecnoLógicasen-US
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/4.0en-US
dc.sourceTecnoLógicas; Vol. 29 No. 65 (2026); e3450en-US
dc.sourceTecnoLógicas; Vol. 29 Núm. 65 (2026); e3450es-ES
dc.source2256-5337
dc.source0123-7799
dc.subjectonda acústicaes-ES
dc.subjectconversión energéticaes-ES
dc.subjectferrofluidoes-ES
dc.subjectnanopartículaes-ES
dc.subjectenergía térmicaes-ES
dc.subjectacoustic waveen-US
dc.subjectenergy conversionen-US
dc.subjectferrofluiden-US
dc.subjectnanoparticleen-US
dc.subjectthermal energyen-US
dc.titleEvaluation of Acoustic Excitation on the Stability and Thermal Performance of Nanofluidsen-US
dc.titleEvaluación de excitación acústica en la estabilidad y desempeño térmico de nanofluidoses-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeResearch Papersen-US
dc.typeArtículos de investigaciónes-ES

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