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用于传热应用的二维二硫化钼基乙二醇纳米流体的流变学和热导率研究

Rheological and Thermal Conductivity Study of Two-Dimensional Molybdenum Disulfide-Based Ethylene Glycol Nanofluids for Heat Transfer Applications.

作者信息

Shah Syed Nadeem Abbas, Shahabuddin Syed, Khalid Mohammad, Mohd Sabri Mohd Faizul, Mohd Salleh Mohd Faiz, Muhamad Sarih Norazilawati, Rahman Saidur

机构信息

Department of Mechanical Engineering (Main Campus Lahore), University of Engineering, and Technology, Lahore 54890, Pakistan.

Department of Science, School of Technology, Pandit Deendayal Energy University, Knowledge Corridor, Raisan Village, Gandhinagar 382007, Gujarat, India.

出版信息

Nanomaterials (Basel). 2022 Mar 21;12(6):1021. doi: 10.3390/nano12061021.

DOI:10.3390/nano12061021
PMID:35335835
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8954611/
Abstract

The rheological behavior of two-dimensional (2D) MoS-based ethylene glycol (EG) nanofluids (NFs) was investigated at low volume concentrations (0.005%, 0.0075%, and 0.01%) in a wide temperature range of 0-70 °C and at atmospheric pressure. A conventional two-step method was followed to prepare NFs at desired volume concentrations. Based on the control rotational (0.1-1000 s shear rate) and oscillation (0.01-1000% strain) methods, the viscoelastic flow curves and thixotropic (3ITT (three interval thixotropic) and hysteresis loop) characteristics of NFs were examined. Shear flow behavior revealed a remarkable reduction (1.3~14.7%) in apparent dynamic viscosity, which showed concentration and temperature dependency. Such remarkable viscosity results were assigned to the change in activation energy of the ethylene glycol with the addition of MoS. However, the nanofluids exhibited Newtonian behavior at all temperatures for concentrations below 0.01% between 10 and 1000 s. On the other hand, strain sweep (@1Hz) indicated the viscoelastic nature of NFs with yielding, which varied with concentration and temperature. Besides, 3ITT and hysteresis loop analysis was evident of non-thixotropic behavior of NFs. Among all tested concentrations, 0.005% outperformed at almost all targeted temperatures. At the same time, ~11% improvement in thermal conductivity can be considered advantageous on top of the improved rheological properties. In addition, viscosity enhancement and reduction mechanisms were also discussed.

摘要

研究了二维（2D）MoS基乙二醇（EG）纳米流体（NFs）在0.005%、0.0075%和0.01%的低体积浓度下，在0至70°C的宽温度范围内及大气压下的流变行为。采用传统的两步法制备所需体积浓度的纳米流体。基于控制旋转（0.1 - 1000 s剪切速率）和振荡（0.01 - 1000%应变）方法，研究了纳米流体的粘弹性流动曲线和触变性（3ITT（三区间触变性）和滞后回线）特性。剪切流动行为表明表观动态粘度显著降低（1.3%~14.7%），这表现出浓度和温度依赖性。这种显著的粘度结果归因于添加MoS后乙二醇活化能的变化。然而，对于浓度低于0.01%且在10至1000 s之间的情况，纳米流体在所有温度下均表现出牛顿流体行为。另一方面，应变扫描（@1Hz）表明纳米流体具有屈服的粘弹性性质，其随浓度和温度而变化。此外，3ITT和滞后回线分析表明纳米流体具有非触变性行为。在所有测试浓度中，0.005%在几乎所有目标温度下表现最佳。同时，在改善流变性能的基础上，热导率提高约11%可被视为有利。此外，还讨论了粘度增强和降低的机制。

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本文引用的文献

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Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties.二维二硫化钨基乙二醇纳米流体：稳定性、热导率和流变特性
Nanomaterials (Basel). 2020 Jul 9;10(7):1340. doi: 10.3390/nano10071340.
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Darcy-Forchheimer hybrid (MoS, SiO) nanofluid flow with entropy generation.达西-福希海默混合（MoS，SiO）纳米流体流动与熵生成。
Comput Methods Programs Biomed. 2020 Mar;185:105152. doi: 10.1016/j.cmpb.2019.105152. Epub 2019 Oct 25.
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Influence of Six Carbon-Based Nanomaterials on the Rheological Properties of Nanofluids.
六种碳基纳米材料对纳米流体流变特性的影响
Nanomaterials (Basel). 2019 Jan 24;9(2):146. doi: 10.3390/nano9020146.
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Synthesis, properties, and optoelectronic applications of two-dimensional MoS and MoS-based heterostructures.二维 MoS 和 MoS 基异质结构的合成、性质及光电应用。
Chem Soc Rev. 2018 Aug 13;47(16):6101-6127. doi: 10.1039/c8cs00314a.