Role of Brownian motion in the enhanced thermal conductivity of nanofluids
Role of Brownian motion in the enhanced thermal conductivity of nanofluids
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DOI：
10.1063/1.1756684
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发表时间：
2004-05-24
影响因子：
4
通讯作者：
Choi, SUS
中科院分区：
文献类型：
--
作者：
Jang, SP;Choi, SUS
我们发现纳米颗粒在分子和纳米尺度上的布朗运动是控制纳米颗粒-流体悬浮液（“纳米流体”）热行为的关键机制。我们设计了一个理论模型来解释纳米流体中动态纳米颗粒的基本作用。该模型不仅捕获了浓度和温度相关的电导率，而且还预测了强烈依赖于尺寸的电导率。此外，我们还发现了固体/固体复合材料和固体/液体悬浮液在尺寸相关电导率方面的根本区别。这一认识有助于设计纳米工程的下一代冷却剂，用于工业和生物医学的高热流密度冷却。(C) 2004年美国物理研究所。
We have found that the Brownian motion of nanoparticles at the molecular and nanoscale level is a key mechanism governing the thermal behavior of nanoparticle-fluid suspensions ("nanofluids"). We have devised a theoretical model that accounts for the fundamental role of dynamic nanoparticles in nanofluids. The model not only captures the concentration and temperature-dependent conductivity, but also predicts strongly size-dependent conductivity. Furthermore, we have discovered a fundamental difference between solid/solid composites and solid/liquid suspensions in size-dependent conductivity. This understanding could lead to design of nanoengineered next-generation coolants with industrial and biomedical applications in high-heat-flux cooling. (C) 2004 American Institute of Physics.