纳米流体
悬挂(拓扑)
DLVO理论
Zeta电位
热导率
材料科学
纳米颗粒
沉积作用
体积分数
粒子(生态学)
热稳定性
复合材料
热力学
化学工程
纳米技术
胶体
物理
地质学
纯数学
工程类
古生物学
海洋学
数学
同伦
沉积物
生物
作者
Hyun Jin Kim,Seung–Hyun Lee,Ji‐Hwan Lee,Seok Pil Jang
出处
期刊:Energy
[Elsevier]
日期:2015-10-01
卷期号:90: 1290-1297
被引量:84
标识
DOI:10.1016/j.energy.2015.06.084
摘要
The suspension stability and thermal conductivity of water-based bohemite alumina nanofluids created using nanoparticles of various shapes (brick, platelet, and blade) at concentrations from 0.3 vol% to 7.0 vol% were theoretically and experimentally investigated. To quantitatively examine the effect of nanoparticle shape on suspension stability, this study uses the laser-scattering method rather than the zeta-potential measurement or the sedimentation test because both the zeta-potential and sedimentation tests cannot systematically represent the suspension stability of nanofluids. Using the DLVO (Derjaguin and Landau, Verwey and Overbeek) theory, we explain why the suspension stability varies with nanoparticle shape despite similar volume fraction of nanoparticles, pH, and temperature. The thermal conductivities are also measured by the transient hot wire method, which was developed in house. Experimental data are compared with theoretical results predicted by the Hamilton–Crosser model, which considers the effect of nanoparticle shape. It is shown that the model cannot predict nanofluids thermal conductivity relative to nanoparticle shape. Finally it is clearly shown that the thermal conductivity of nanofluids strongly depends on the suspension stability of bohemite alumina with various shapes.
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