Thermal Conductivity Characterization of High Oleic Vegetable Oils Based Hybrid Nanofluids Formulated Using GnP, TiO2, MoS2, Al2O3 Nanoparticles for MQL Machining

IF 2.5 4区工程技术 Q3 CHEMISTRY, PHYSICAL

International Journal of Thermophysics Pub Date : 2024-11-23 DOI:10.1007/s10765-024-03472-7

Anthony Chukwujekwu Okafor, Tobechukwu Kingsley Abor, Saidanvar Esanjonovich Valiev, Ignatius Echezona Ekengwu, Abiodun Saka, Monday U. Okoronkwo

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引用次数: 0

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.

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使用 GnP、TiO2、MoS2、Al2O3 纳米颗粒配制的高油酸植物油基混合纳米流体在 MQL 加工中的导热特性分析

本文采用两步法对六种高油酸大豆油（HOSO）和四种高油酸菜籽油（HOCO）基混合纳米流体的热导率表征结果进行了介绍，这些混合纳米流体由四种类型的纳米颗粒（纳米石墨烯（xGnP）、TiO2、MoS2 和 Al2O3）配制而成，纳米颗粒的重量百分比浓度从 1 % 到 7 %，以 1 % 为增量，用于难切削金属的 MQL 加工。使用 Thermtest 瞬态热线液体导热仪测量了配制的混合纳米流体在 25 °C 至 75 °C 温度范围内以 10 °C 为增量的导热率。结果表明，所有纳米流体的热导率都随温度的升高而线性降低，而热导率的增强则随重量百分比浓度的增加而非线性增加，呈二阶多项式。当纳米粒子浓度为 7 wt%时，混合纳米流体 xGnP-TiO2/HOSO 的热导率增强率最高（25 和 75 ℃ 时分别为 109.73 % 和 103.31 %），其次是 xGnP-TiO2/HOCO （25 和 75 ℃ 时分别为 101.36 % 和 97.52 %）、xGnP-MoS2/HOCO（25 和 75 ℃ 时分别为 101.36 % 和 97.52 %）、xGnP-MoS2/HOCO（25 和 75 ℃ 时分别为 101.36 % 和 97.52 %）、xGnP-MoS2/HOCO（25 和 75 ℃ 时分别为 101.73 % 和 103.31 %）。xGnP-Al2O3/HOCO（25 °C 和 75 °C 时分别为 101.36 % 和 97.52 %）、xGnP-MoS2/HOSO（25 °C 和 75 °C 时分别为 96.3 % 和 96.89 %）、xGnP-Al2O3/HOCO（25 °C 和 75 °C 时分别为 91.62 % 和 83.23 %）、xGnP-Al2O3/HOSO（25 °C 和 75 °C 时分别为 91.25 % 和 83.23 %）。xGnP 混合纳米流体建议用于 MQL 加工。TiO2-MoS2/HOSO、TiO2-MoS2/HOCO、MoS2-Al2O3/HOSO、TiO2-Al2O3/HOSO 混合纳米流体的热导率最低，由于其热导率增强效果不明显，因此不建议用作基础流体。混合纳米流体的热导率低于单纳米流体，但其固有的其他特性可能会带来益处。

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来源期刊

International Journal of Thermophysics 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

179

审稿时长

5 months

期刊介绍： International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.