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首页> 外文会议>Nanoscale thermoelectric materials: Thermal and electrical transport, and applications to solid-state cooling and power generation >Thermal and rheological properties of micro- and nanofluids of copper in diethylene glycol - as heat exchange liquid
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Thermal and rheological properties of micro- and nanofluids of copper in diethylene glycol - as heat exchange liquid

机译：二甘醇中铜的微和纳米流体的热和流变特性-作为热交换液体

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摘要

This study reports on the fabrication of nanofluids/microfluids (NFs/MFs) with experimental and theoretical investigation of thermal conductivity (TC) and viscosity of diethylene glycol (DEG) base NFs/MFs containing copper nanoparticles (Cu NPs) and copper microparticles (Cu MPs). For this purpose, Cu NPs (20-40 nm) and Cu MPs (0.5-1.5 μm) were dispersed in DEG with particle loading between 1 wt% and 3 wt%. Ultrasonic agitation was used for dispersion and preparation of stable NFs/MFs, and thus the use of surfactants was avoided. The objectives were investigation of impact of size of Cu particle and concentration on TC and viscosity of NFs/MFs on DEG as the model base liquid. The physicochemical properties of all particles and fluids were characterized by using various techniques including Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Dynamic Light Scattering (DLS) techniques. Fourier Transform Infrared Spectroscopy (FTIR) analysis was performed to study particles' surfaces. NFs and MFs exhibited a higher TC than the base liquid, while NFs outperformed MFs showing a potential for their use in heat exchange applications. The TC and viscosity of NFs and MFs were presented, along with a comparison with values from predictive models. While Maxwell model was good at predicting the TC of MFs, it underestimated the TC of NFs, revealing that the model is not directly applicable to the NF systems.
机译：这项研究报告了纳米流体/微流体（NFs / MFs）的制造，并通过实验和理论研究了包含铜纳米颗粒（Cu NPs）和铜微粒（Cu议员）。为此，将Cu NP（20-40 nm）和Cu MP（0.5-1.5μm）分散在DEG中，颗粒负载量为1 wt％至3 wt％。超声搅拌用于分散和制备稳定的NF / MF，因此避免使用表面活性剂。目的是研究作为模型基础液的DEG对Cu颗粒大小和浓度对TC和NFs / MFs粘度的影响。通过使用各种技术（包括透射电子显微镜（TEM），扫描电子显微镜（SEM）和动态光散射（DLS）技术）来表征所有颗粒和流体的物理化学性质。进行了傅立叶变换红外光谱（FTIR）分析以研究颗粒的表面。 NF和MF的TC比基础液体高，而NF的性能优于MF，这表明它们在热交换应用中具有潜力。介绍了NF和MF的TC和粘度，并与预测模型的值进行了比较。尽管Maxwell模型擅长预测MF的TC，但它低估了NF的TC，这表明该模型不适用于NF系统。

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