Hi'/> Effect of temperature and CuO-nanoparticle concentration on the thermal conductivity and viscosity of an organic phase-change material
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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of temperature and CuO-nanoparticle concentration on the thermal conductivity and viscosity of an organic phase-change material
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Effect of temperature and CuO-nanoparticle concentration on the thermal conductivity and viscosity of an organic phase-change material

机译：温度和CuO-纳米粒子浓度对有机相变材料导热系数和粘度的影响

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Highlights•Nano-PCM based on Octadecane and modified nanoparticles of CuO was prepared.•Effect of temperature and CuO mv% on thermal conductivity and viscosity was studied.•Thermal conductivity variation with temperature and CuO mv% was modeled.•A nanofluid model describes viscosity variation with temperature and CuO mv%.•Octadecane becomes shear-thinning non-Newtonian fluid by addition of nanoparticles.AbstractThe main results of an experimental study of the effect of temperature and nanoparticle concentration on thermal conductivity and viscosity of a nanofluid are shown. The nanofluid was prepared with Octadecane, an alkane hydrocarbon with the chemical formula CH3(CH2)16CH3, as a base fluid and 75-nm CuO spherical nanoparticles. Since the base fluid is a phase change material (PCM) to be used in thermal storage applications, the engineered nanofluid is referred to as Nano-PCM. Three Nano-PCMs were prepared by the two-step method (2.5% w/v, 5.0% w/v, and 10.0% w/v). In order to increase the stability of the Nano-PCM, the surface of the CuO nanoparticles were modified with Sodium oleate, and it was verified by IR analysis. The modified CuO nanoparticles were dispersed with an ultrasonic horn. The thermal conductivity was measured with a thermal properties analyzer in the temperature range of 30–40 °C. The viscosity was measured in the temperature range of 30–55 °C. The results for the Nano-PCM showed that thermal conductivity is almost constant in the analyzed temperature range, and the viscosity decreases non-linearly with temperature. With respect to the effect of nanoparticle concentration, both thermal conductivity and viscosity increased with nanoparticle concentration. Thermal conductivity increased up to 9% with respect to the base fluid, and viscosity increased up to 60%, in both cases with increasing concentration. Finally, the viscosity measurements for different deformation rates (30–80 RPM) showed that the addition of nanoparticles modifies the rheological behavior of the base fluid, from a Newtonian to a shear thinning (power-law) non-Newtonian behavior.
机译： 突出显示 • 制备了基于十八烷基和改性纳米粒子的纳米PCM。 • 温度和CuO mv％对热导率的影响 • 模拟了温度和CuO mv％的热导率变化。 • 纳米流体模型描述了粘度随温度的变化 • 通过添加纳米颗粒，十八烷变成了剪切稀化的非牛顿流体。 摘要 温度和温度影响的实验研究的主要结果显示了纳米颗粒对纳米流体的热导率和粘度的浓度。纳米流体用十八烷（一种化学式为CH 3 （CH 2 ） 16 CH 3 ，作为基础液和75 nm CuO球形纳米颗粒。由于基础流体是要在储热应用中使用的相变材料（PCM），因此工程纳米流体被称为Nano-PCM。通过两步法制备了三个Nano-PCM（2.5％w / v，5.0％w / v和10.0％w / v）。为了增加Nano-PCM的稳定性，用油酸钠对CuO纳米颗粒的表面进行了改性，并通过IR分析进行了验证。将改性的CuO纳米颗粒用超声变幅杆分散。使用热性能分析仪在30–40 C的温度范围内测量热导率。在30–55 C的温度范围内测量粘度。 Nano-PCM的结果表明，在所分析的温度范围内，热导率几乎恒定，粘度随温度呈非线性下降。关于纳米颗粒浓度的影响，导热率和粘度均随纳米颗粒浓度而增加。在两种情况下，随着浓度的增加，相对于基础流体，导热系数最多可增加9％，粘度最多可增加60％。最后，在不同变形速率（30–80 RPM）下的粘度测量结果表明，添加纳米颗粒会改变基础流体的流变行为，从牛顿行为到剪切稀化（幂律）非牛顿行为。

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