Journal of University of Chinese Academy of Sciences >
Molecular dynamics study of slip properties of liquid lithium on α-Fe （100） surface
Received date: 2024-04-07
Revised date: 2024-05-09
Online published: 2024-06-04
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.
Key words： molecular dynamics; liquid lithium; Couette flow; slip length
Huaiyuan QU , Xingang YU . Molecular dynamics study of slip properties of liquid lithium on α-Fe （100） surface[J]. Journal of University of Chinese Academy of Sciences, 2026 , 43(4) : 471 -477 . DOI: 10.7523/j.ucas.2024.047
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