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采用分子动力学与有限容积法多尺度耦合算法对粗糙微通道内的液体Poiseuille流动进行了模拟。分析了粗糙元高度、分布以及几何形状对通道内流动速度和边界滑移长度的影响。结果表明:随着粗糙元高度的增加,流动速度和粗糙元间隙底部壁面上滑移长度均减小;粗糙元分布越密或不同几何形状粗糙元所对应的固壁原子数越多,滑移长度越小,但流动速度变化不大。综合看来,粗糙元高度是影响微通道内液体流动的最主要因素。
The liquid Poiseuille flow in the rough microchannels was simulated by the multi-scale coupling algorithm of molecular dynamics and finite volume method. The effects of roughness element height, distribution and geometry on the flow velocity and the boundary slip length were analyzed. The results show that both the flow velocity and the sliding length at the bottom wall of the gap are reduced with the increase of the height of the roughness element. The more the distribution of the roughness elements is or the number of solid wall atoms corresponding to different roughness elements is larger, The smaller the length, the smaller the flow rate. Taken together, the roughness element height is the most important factor affecting the flow of liquid in the microchannels.