二氧化硅纳米通道中的热渗透作用

Weiqiang Chen, M. Sedighi, A. Jivkov
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引用次数: 3

摘要

热渗透是一种描述由热梯度引起的流体流动的耦合现象。最近对粘土中的热渗透作用以及热、水力和力学耦合分析的研究揭示了这一物理过程在地能和地球环境应用中的重要性。本文通过对硅酸盐层附近界面水行为的一系列分子动力学模拟,量化了纳米通道尺寸对热渗透系数的影响,揭示了纳米尺度空间热渗透控制机制的一些方面。我们的研究结果表明,尺寸效应来自于由通道宽度控制的特定液体结构。边界层的重叠和干扰导致热渗透响应随通道宽度的变化。我们的发现不仅促进了热渗透的基本知识,而且为分析纳米空间中更广泛的耦合传热和传质问题提供了见解和方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermo-osmosis in silica nanochannels
Thermo-osmosis is a coupled phenomenon describing the fluid flow induced by a thermal gradient. Recent studies on thermo-osmosis in clays and within the coupled thermal, hydraulic and mechanical analysis have revealed the importance of this physical processes in geo-energy and geo-environmental applications. This paper presents a series of molecular dynamics simulations of the interfacial water behaviour at the vicinity of silicate layers to quantify the nanochannel size effect on the thermo-osmotic coefficient and reveal some aspects of governing mechanisms of thermo-osmosis in nanoscale space. Our results show that the size effect emerges from the specific liquid structure controlled by the channel width. The overlapping and interfering boundary layers lead to the variations of thermoosmotic response with the channel width. Our findings not only facilitate a basic knowledge of thermo-osmosis, but also contribute insights and methods to analyse a wider category of coupled heat and mass transfer problems in nanometric space.
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