Temperature-dependent thermal conductivity and viscosity of synthesized α-alumina nanofluids
Temperature-dependent thermal conductivity and viscosity of synthesized α-alumina nanofluids
复制标题
合成α-氧化铝纳米流体的温度依赖性热导率和粘度
DOI：
10.1007/s13204-017-0594-7
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发表时间：
2017
影响因子：
--
通讯作者：
Y. Sonvane
中科院分区：
文献类型：
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作者：
Janki Shah;M. Ranjan;Vipul Davariya;Sanjeev K. Gupta;Y. Sonvane
在目前的工作中，我们重点研究了合成的导热性和粘度，并表征了金属氧化物α-Al2O3纳米颗粒悬浮在蒸馏水：乙二醇（60:40）比的稳定胶体纳米流体。添加和不添加表面活性剂时α-Al2O3的带隙分别为4.42和4.59 eV。结果表明，添加聚乙烯醇表面活性剂的纳米颗粒的晶粒尺寸（~23 nm）小于未添加表面活性剂的纳米颗粒（~36 nm）。合成的纳米流体在合成15天后具有良好的稳定性，并通过zeta电位分析仪进行了表征。在0.1 wt%和0.5 wt%的氧化铝浓度下，在有和没有表面活性剂的情况下，测量了热导率和粘度。颗粒的浓度和表面活性剂的加入对纳米流体的稳定性、热导率的提高和粘度随温度的变化起着重要的作用。因此，与传统的冷却流体相比，α-Al2O3纳米流体的新特性组合已被证明是热稳定性最好的传热流体。
In the present work, we focused on the thermal conductivity and viscosity of the synthesis as well as characterize metal oxide α-Al2O3 nanoparticles suspended in distilled water:ethylene glycol (60:40) ratio based stable colloidal nanofluid. The band gap of the α-Al2O3 with and without surfactant is 4.42 and 4.59 eV, respectively. The results show that nanoparticle with polyvinyl alcohol surfactant has smaller crystalline size (~23 nm) than without surfactant (~36 nm). The synthesized nanofluids have good stability after 15 days of synthesis which is characterized by zeta potential analyzer. Thermal conductivity and viscosity are measured for 0.1 and 0.5 wt% concentration of alumina for with and without surfactant. The concentration of particles and added surfactant are responsible for stable fluid, thermal conductivity enhancement, and viscosity of nanofluid with respect to temperature. Therefore, the novel combinations of characterized properties of α-Al2O3 nanofluid has proved to be the best thermally stable heat transfer fluid compared to conventional cooling fluids.