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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermophysical and natural convection characteristics of ethylene glycol and water mixture based ZnO nanofluids
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Thermophysical and natural convection characteristics of ethylene glycol and water mixture based ZnO nanofluids

机译：乙二醇和水混合物基ZnO纳米流体的热物理和自然对流特性

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摘要

Stabilized nanofluids have been prepared by dispersing dry ZnO nanoparticles in different base fluids including 75:25,85:15 and 95:5 (by volume) of ethylene glycol (EG) and deionized water (DW) mixtures. Thermal conductivity and viscosity experiments have been conducted at temperatures between 15℃ and 55 ℃ with mass fraction of nanoparticle of 5.25%. What's more, natural convection characteristics of EG/DW based ZnO nanofluids were also investigated. The thermal conductivity of nanofluid with more DW is bigger because the network of direct and tight connection in spatial structures between atoms expedites heat transfer between nanoparticles, and it increases with increasing the temperature as expected. Meanwhile, the viscosity of nanofluid increases with increasing the concentration of EG. When the temperature increases, the intermolecular distance becomes larger, which leads to the decrease of the viscosity. Natural convection experiment shows that the presence of nanoparticles deteriorates the natural convective heat transfer under present condition.
机译：通过将干燥的ZnO纳米颗粒分散在不同的基础流体中（包括体积比为75：25、85：15和95：5的乙二醇（EG）和去离子水（DW）混合物），可以制备稳定的纳米流体。已经在15℃至55℃之间的温度下进行了导热率和粘度实验，纳米颗粒的质量分数为5.25％。此外，还研究了基于EG / DW的ZnO纳米流体的自然对流特性。具有更多DW的纳米流体的热导率更大，这是因为原子之间的空间结构中的直接和紧密连接的网络加快了纳米颗粒之间的传热，并且其随着温度的升高而增加。同时，纳米流体的粘度随着EG浓度的增加而增加。当温度升高时，分子间距离变大，这导致粘度降低。自然对流实验表明，在当前条件下，纳米颗粒的存在会破坏自然对流换热。

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