中文摘要：

建立一个2侧带有缓冲池的bulk．nanochannel—bulk模型，采用非平衡态的分子动力学模拟方法研究热运动的硅原子对受限于纳通道中氯化钠溶液黏度的影响．该模拟在不同的通道上板移动速度、通道高度和通道壁面电荷密度的情况下进行．模拟结果表明：随着通道壁面电荷密度的增加、通道高度和剪切率的减小，热运动的硅原子对受限于纳米通道中流体的剪切黏度有着不可忽视的影响，当通道高度小于0．8nm，剪切率小于1．0×10^11 s^-1时，热运动的硅原子导致了通道中氯化钠溶液的黏度减小，并且剪切率越小，这一现象越明显．这是由于热运动的硅原子减弱了反离子（Na^＋）和带电的通道壁面之间的相互作用引起的．

英文摘要：

A physical model of bulk-nanochannel-bulk with buffer baths is built up using nonequilibrium molecular dynamics （MD） simulation to study the effects of vibrating silicon atoms on the viscosity of aqueous NaCl solutions confined in the nanochannel. The simulation is performed under different moving speeds of the upper wall, different heights and different surface charge densities in the nanochannel. The simulation results indicate that with the increase in the surface charge density and the decrease in the nanochannel height and the shear rate, the vibration effect of silicon atoms on the shear viscosity of the confined fluid in the nanochannel cannot be ignored. Compared with still silicon atoms, the vibrating silicon atoms result in the decrease in the viscosity when the height of the nanochannel is less than 0.8 nm and the shear rate is less than 1.0 ×10^11 s^-1, and the effect of the vibrating silicon atoms on the shear viscosity is significant when the shear rate is small. This is due to the fact that the vibrating silicon atoms weaken the interactions between the counter-ions （Na^＋ ） and the charged surface.