Markvoort A J, Hilbers P A J, Nedea S V
Department of Biomedical Engineering, Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jun;71(6 Pt 2):066702. doi: 10.1103/PhysRevE.71.066702. Epub 2005 Jun 8.
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.
特别是在纳米尺度下，界面起着重要作用。已经通过分子动力学研究了润湿性对固液界面的影响。在本文中，我们研究了不同密度气体下润湿性对固气界面的依赖性，并使用分子动力学研究了润湿性对通过该界面的热传输特性的影响。随后，我们展示了沿表面流动的气体的流动剖面如何也取决于这种润湿性。这些模拟表明，润湿性提高了固体对静止气体的传导率，并降低了气流在界面附近的流速。这两种效应以相反的方式影响沿固体表面流动的冷气体对固体的冷却。然而，我们表明，较高的润湿性对冷却有积极的净效应，这解释了实验结果，即亲水性微通道的热冷却效果优于疏水性微通道。
