Molecular dynamics study of the influence of wall-gas interactions on heat flow in nanochannels
Molecular dynamics study of the influence of wall-gas interactions on heat flow in nanochannels
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DOI：
10.1103/physreve.71.066702
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发表时间：
2005-06-01
影响因子：
2.4
通讯作者：
Nedea, SV
中科院分区：
文献类型：
--
作者：
Markvoort, AJ;Hilbers, PAJ;Nedea, SV
特别是在纳米尺度上，界面起着重要的作用。润湿性对固液界面的影响已经用分子动力学研究过。在本文中，我们研究了不同密度气体的固-气界面上的润湿的依赖性，并使用分子动力学研究了润湿对这种界面上的热输运性质的影响。随后，我们展示了如何沿沿着表面流动的气体的流动轮廓也取决于这种润湿性。这些模拟结果表明，润湿性增加了固体的导电性，一个固定的气体，并降低了界面附近的气流的流速。这两种效应影响着由沿着其表面流动的冷气体以相反的方式实现的固体的冷却。然而，我们发现，更高的润湿性有一个积极的净效应的冷却，解释实验结果表明，增加的热冷却效果的亲水性疏水微通道。
Especially at the nanometer scale interfaces play an important role. The effect of the wettability on the solid-liquid interface has already been studied with molecular dynamics. In this paper we study the dependence of wetting on the solid-gas interface for different density gases and investigate the influence of wetting on the heat transport properties over such an interface using molecular dynamics. Subsequently we show how the flow profile of a gas flowing along a surface also depends on this wettability. These simulations show that wettability increases the conductivity of a solid to a stationary gas and decreases the flow velocity near the interface for a gas flow. These two effects influence the cooling of a solid achieved by a cold gas flowing along its surface in opposite ways. However, we show that a higher wettability has a positive net effect on the cooling, explaining experimental results that showed an increased heat cooling effect of hydrophilic over hydrophobic microchannels.