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arXiv 0906.0438cond-mat.mtrl-sci
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纳米颗粒传热的对应态分析

Heat transfer from nanoparticles: a corresponding state analysis

Samy Merabia, Serguei Shenogin, Laurent Joly, Pawel Keblinski, J. -L. Barrat

摘要:

在这方面的贡献,我们研究的情况下,在流体中的纳米粒子被强烈加热,产生高的热通量。这种情况与利用固体颗粒对辐射的选择性吸收来局部加热流体的实验有关。我们首先研究这种情况下,不同类型的分子相互作用,使用模型的金颗粒悬浮在辛烷和水中。正如在实验中已经报告的那样,在这种情况下可以观察到非常高的热通量和温度升高(最终导致颗粒破坏)。我们表明,一个非常简单的建模的基础上Lennard-Jones相互作用捕捉到这些实验的基本特征,并为各种液体的结果可以映射到Lennard-Jones的情况下,提供了一个物理合理的(相应的状态)的参数选择。物理上,维持非常高的热通量的可能性与界面的强曲率有关,该界面的强曲率抑制了绝缘蒸汽膜的形成。

英文摘要:

In this contribution, we study situations in which nanoparticles in a fluid are strongly heated, generating high heat fluxes. This situation is relevant to experiments in which a fluid is locally heated using selective absorption of radiation by solid particles. We first study this situation for different types of molecular interactions, using models for gold particles suspended in octane and in water. As already reported in experiments, very high heat fluxes and temperature elevations (leading eventually to particle destruction) can be observed in such situations. We show that a very simple modeling based on Lennard-Jones interactions captures the essential features of such experiments, and that the results for various liquids can be mapped onto the Lennard-Jones case, provided a physically justified (corresponding state) choice of parameters is made. Physically, the possibility of sustaining very high heat fluxes is related to the strong curvature of the interface that inhibits the formation of an insulating vapor film.

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