Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes
Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes
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DOI：
10.1063/1.2834370
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发表时间：
2008-01
影响因子：
4
通讯作者：
Jesse Wensel;Brian Wright;Dustin Thomas;Wayne Douglas;Bert D Mannhalter;W. Cross;H. Hong;J. Kellar;Pauline M. Smith;W. Roy
中科院分区：
文献类型：
--
作者：
Jesse Wensel;Brian Wright;Dustin Thomas;Wayne Douglas;Bert D Mannhalter;W. Cross;H. Hong;J. Kellar;Pauline M. Smith;W. Roy
含有金属氧化物纳米颗粒和碳纳米管的传热纳米流体的热导率（TC）增加约10%，这两种纳米材料的负载百分比非常低（约0.02wt%）。这些流体非常稳定，粘度保持与水大致相同。对这些有趣的结果的一个可能的解释是金属氧化物颗粒通过静电引力聚集在纳米管表面并形成沿着纳米管的聚集链。随时间变化的磁场结果表明，在强外磁场的影响下，TC值降低。此外，当pH从7变化到11.45时，TC值降低。
An approximately 10% increase in the thermal conductivity (TC) of heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes has been determined with very low percentage loading (around 0.02wt%) of these two nanomaterials. These fluids are very stable and the viscosity remains approximately the same as water. A possible explanation for these interesting results is the aggregation of metal oxide particles on the surface of nanotubes by electrostatic attraction and form the aggregation chain along the nanotube. Time dependant magnetic results demonstrate that, under the influence of a strong outside magnetic field, the TC value decreases. Also, the TC value decreases when the pH is shifted from 7 to 11.45.