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首页> 外文期刊>Tribology International >Behaviour of n-alkanes confined between iron oxide surfaces at high pressure and shear rate: A nonequilibrium molecular dynamics study
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Behaviour of n-alkanes confined between iron oxide surfaces at high pressure and shear rate: A nonequilibrium molecular dynamics study

机译：高压和剪切速率下氧化氧化物表面之间的N-烷烃的行为：非核状分子动力学研究

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摘要

The behaviour of n-alkanes confined and sheared between iron oxide surfaces has been studied using nonequilibrium molecular dynamics simulations. The molecular extension, orientation, film structure, flow, and friction have been investigated for a range of n-alkane chain lengths under conditions representative of the elastohydrodynamic lubrication regime. At high pressure, the molecules show strong layering and long-range order, suggesting solid-like films. Conversely, high shear rates result in less elongated, layered, and ordered molecules; indicating more liquid-like films. Although Couette flow is usually observed for short n-alkanes, the flow is often non-linear for long n-alkanes. The friction coefficient increases logarithmically with shear rate, but the slope decreases with increasing pressure such that it becomes insensitive to shear rate for long n-alkanes.
机译：使用非Quigibirim分子动力学模拟研究了在氧化铁表面之间限制和剪切的N-烷烃的行为。 在弹性流体润滑制度的条件下，已经研究了分子延伸，取向，薄膜结构，流动和摩擦。 在高压下，分子显示出强烈的分层和远程顺序，表明固体状薄膜。 相反，高剪切速率导致更少的细长，分层和有序分子; 表示更多液体状薄膜。 虽然通常观察到短N-烷烃的豆流程，但是该流动通常是长N-烷烃的非线性。 摩擦系数以剪切速率对数增加，但斜率随着压力的增加而降低，使得对长N-烷烃的剪切速率不敏感。

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