Thermal Transport and Rheological Properties of Hybrid Nanofluids Based on Vegetable Lubricants

Hélio Ribeiro; Jose Jaime Taha-Tijerina; Ofelia Gomez; Ever Acosta; Gabriel M. Pinto; Lorena R. C. Moraes; Guilhermino J. M. Fechine; Ricardo J. E. Andrade; Jefferson Reinoza; Victoria Padilla; Karen Lozano

doi:10.3390/nano13202739

Nanomaterials (Oct 2023)

Thermal Transport and Rheological Properties of Hybrid Nanofluids Based on Vegetable Lubricants

Hélio Ribeiro,
Jose Jaime Taha-Tijerina,
Ofelia Gomez,
Ever Acosta,
Gabriel M. Pinto,
Lorena R. C. Moraes,
Guilhermino J. M. Fechine,
Ricardo J. E. Andrade,
Jefferson Reinoza,
Victoria Padilla,
Karen Lozano

Affiliations

Hélio Ribeiro: Department of Informatics and Engineering Systems, University of Texas Rio Grande Valley—UTRGV, Brownsville, TX 78520, USA
Jose Jaime Taha-Tijerina: Department of Informatics and Engineering Systems, University of Texas Rio Grande Valley—UTRGV, Brownsville, TX 78520, USA
Ofelia Gomez: Department of Mechanical Engineering, University of Texas Rio Grande Valley—UTRGV, Edinburg, TX 78539, USA
Ever Acosta: Department of Mechanical Engineering, University of Texas Rio Grande Valley—UTRGV, Edinburg, TX 78539, USA
Gabriel M. Pinto: Engineering School, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo 01302-907, SP, Brazil
Lorena R. C. Moraes: Departament of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, Católica do Rio de Janeiro 22453-900, RJ, Brazil
Guilhermino J. M. Fechine: Engineering School, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo 01302-907, SP, Brazil
Ricardo J. E. Andrade: Engineering School, Mackenzie Presbyterian University, Rua da Consolação 896, São Paulo 01302-907, SP, Brazil
Jefferson Reinoza: Department of Mechanical Engineering, University of Texas Rio Grande Valley—UTRGV, Edinburg, TX 78539, USA
Victoria Padilla: Department of Mechanical Engineering, University of Texas Rio Grande Valley—UTRGV, Edinburg, TX 78539, USA
Karen Lozano: Department of Mechanical Engineering, University of Texas Rio Grande Valley—UTRGV, Edinburg, TX 78539, USA

DOI: https://doi.org/10.3390/nano13202739
Journal volume & issue: Vol. 13, no. 20
p. 2739

Abstract

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Nanofluids based on vegetal oil with different wt.% of carbon nanotubes (CNT), hexagonal boron nitride (h-BN), and its hybrid (h-BN@CNT) were produced to investigate the effects of these nano-additives on the thermal conductivity and rheological properties of nanofluids. Stable suspensions of these oil/nanostructures were produced without the use of stabilizing agents. The dispersed nanostructures were investigated by SEM, EDS, XRD, and XPS, while the thermal conductivity and rheological characteristics were studied by a transient hot-wire method and steady-state flow tests, respectively. Increases in thermal conductivity of up to 39% were observed for fluids produced with 0.5 wt.% of the hybrid nanomaterials. As for the rheological properties, it was verified that both the base fluid and the h-BN suspensions exhibited Newtonian behavior, while the presence of CNT modified this tendency. This change in behavior is attributed to the hydrophobic character of both CNT and the base oil, while h-BN nanostructures have lip-lip “bonds”, giving it a partial ionic character. However, the combination of these nanostructures was fundamental for the synergistic effect on the increase of thermal conductivity with respect to their counterparts.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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