Abstract
This paper presents the results of thermal conductivity characterization of six high oleic soybean oil (HOSO) and four high oleic canola oil (HOCO)-based hybrid nanofluids formulated with four types of nanoparticles (Graphene nanoplatelet (xGnP), TiO2, MoS2, and Al2O3) at nanoparticles wt.% concentration from 1 % to 7 % in 1 % increment using the two-step method for use in MQL machining of difficult-to-cut metals. Thermal conductivity of the formulated hybrid nanofluids were measured using Thermtest Transient Hot Wire Liquid Thermal Conductivity Meter at temperatures from 25 °C to 75 °C in increment of 10 °C. Obtained results showed that thermal conductivity of all nanofluids decreases linearly with temperature, while the thermal conductivity enhancement increases nonlinearly with increase in wt.% concentration, following second order polynomial. At 7-wt% nanoparticle concentration, hybrid nanofluids xGnP-TiO2/HOSO gave the highest thermal conductivity enhancement (109.73 % and 103.31 % at 25 and 75 °C) followed by xGnP-TiO2/HOCO (101.36 % and 97.52 % at 25 °C and 75 °C), xGnP-MoS2/HOCO (101.36 % and 97.52 % at 25 °C and 75 °C), xGnP-MoS2/HOSO (96.3 % and 96.89 % at 25 °C and 75 °C), xGnP-Al2O3/HOCO (91.62 % and 83.23 % at 25 °C and 75 °C), xGnP-Al2O3/HOSO (91.25 % and 83.23 % at 25 °C and 75 °C). xGnP hybrid nanofluids are recommended for MQL machining. TiO2–MoS2/HOSO, TiO2–MoS2/HOCO, MoS2–Al2O3/HOSO, TiO2–Al2O3/HOSO hybrid nanofluids gave the lowest thermal conductivities and are not recommended as base fluids due to their insignificant thermal conductivity enhancement. Thermal conductivity of the hybrid nanofluids is lower than that of mono-nanofluids, but there are other inherent properties that could be beneficial.
Recommended Citation
A. C. Okafor et al., "Thermal Conductivity Characterization of High Oleic Vegetable Oils based Hybrid Nanofluids Formulated using GnP, TiO2, MoS2, Al2O3 Nanoparticles for MQL Machining," International Journal of Thermophysics, vol. 45, no. 12, article no. 169, Springer, Dec 2024.
The definitive version is available at https://doi.org/10.1007/s10765-024-03472-7
Department(s)
Mechanical and Aerospace Engineering
Second Department
Chemical and Biochemical Engineering
Keywords and Phrases
Graphene nanoplatelet-Al O –MoS –TiO -nanoparticles 2 3 2 2; High oleic vegetable oils; Hybrid-nanofluid; Minimum quantity lubrication machining; Thermal conductivity characterization; Transient hot wire method
International Standard Serial Number (ISSN)
1572-9567; 0195-928X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Springer, All rights reserved.
Publication Date
01 Dec 2024
Included in
Chemical Engineering Commons, Civil and Environmental Engineering Commons, Engineering Mechanics Commons, Materials Chemistry Commons, Materials Science and Engineering Commons, Mechanical Engineering Commons
Comments
Missouri University of Science and Technology, Grant NSF CMMI2218786