采用分子动力学方法模拟液态Li在α-铁（Fe）纳米通道中的Couette流动，分析三角形表面粗糙单元对液态Li在α-Fe （100）表面滑移特性的影响。结果表明三角形两侧角度对滑移长度的影响并不显著，但是存在一个临界角度，当三角形两侧角度超过该临界值时，液态Li会在三角形前侧形成微尺度旋涡，显著增加流动阻力，进而引起滑移长度的突然大幅下降；三角形高度对滑移长度具有更加显著的影响，且同样存在一个临界高度，只有当三角形高度超过临界值时才会形成旋涡，否则无论如何改变三角形的角度都不会在三角形附近形成旋涡；温度对于临界角度和临界高度都有一定的影响，随着温度的升高，临界角度和高度都呈下降趋势。

Liquid lithium （Li） has a wide range of applications in nuclear fusion test devices， but the slip characteristics of liquid Li on the surface of solid materials have not been fully studied. In this paper， the Couette flow of liquid Li in α-iron （Fe） nanochannels was simulated by the molecular dynamics method， and the effect of triangular roughness units on the slip characteristics of liquid Li on the α-Fe （100） surface was analyzed. The results show that the influence of the angle on both sides of the triangle on the slip length is not significant， but there is a critical angle， when the angle on both sides of the triangle exceeds the critical value， the liquid Li will form a microscale vortex on the front side of the triangle， which significantly increases the flow resistance， and then causes a sudden and large decrease in the slip length， the critical angle and the height show a downward trend. The height of the triangles has a more pronounced impact on slip length， and a similar critical height exists. Vortices only form when the height exceeds this critical value， regardless of changes to the angles. Temperature has a certain influence on these parameters. As temperature rises， both the critical angle and critical height decrease.