摘要
温度对纳米通道内流体的流动有显著的作用。运用分子动力学方法，模拟了不同温度下气体混合物在纳米通道内的Poiseuille流动。结果表明：气体混合物化学成分和物理结构都是非均匀的，固壁附近亲水粒子密度随着温度的升高而降低，疏水粒子随着温度的升高逐渐能够到达固壁附近。纳米通道内混合气体在温度较低时有明显的分层现象，而随着温度的升高，密度分布趋于一致。同时在固体壁面从温度较低时的无表观滑移到表观滑移速度随着温度的升高而逐渐增大，而在通道中心混合气体的流动速度随着温度的升高而降低。
Temperature has a significant role on the fluid flow in nanochannel. Molecular dynamics method was adopted to simulate the Poiseuille flow of gas mixture in nanochannel at different temperatures. The results show that chemical composition and physical structure of gas mixture are non-uniform, the density of hydrophilic particle near solid-wall decreases with temperature increasing, hydrophobic particles gradually reach the solid wall vicinity as the temperature rises. There is a clear stratification of the gas mixture distribution in nanochannels at lower temperatures, but as the temperature increased, the density distribution gradually tends to be consistent. At the same time, from no apparent velocity at lower temperatures to apparent slip velocity increasing with temperature gradually rising; the flow gas mixture velocity decreases with growing temperature in the center channel.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第6期921-924,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50376077
No.50776101)
