中文摘要：

Lab-on-a-Chip（芯片实验室）系统迅速发展对微流体的研究提出更高的要求,微通道壁面粗糙度对微尺度下的流体存在显著影响。采用有限元模拟研究了壁面机糙度对圆形截面微通道内电渗流的影响机理。壁面粗糙度几何模型采用三角形波形并考察了微通道两端存在阻碍压力作用下的情况。结果表明,壁面粗糙度宽度和间隔增加时微通道中截面流速先减小后增加。相对粗糙度值在0.01～6%之间时截面流速随着相对粗糙度的增加非线性减小,但减小趋势变缓。相对粗糙度增加时压力与截面流速线的斜率减小,截面流速不易受压力变化的影响。

英文摘要：

Higher requests to microfluidics study are ste due to the rapid growth of the Lab-on-a-Chip systems and the wall surface roughness of microchannels has a significant Influence on flow.The influence mechanism of triangle surface roughness on electroosmotic（EO）flow in microchannels with circular cross-section is studied by the finite element simulation.The geometries of the surface roughness is modeled by triangular waves and the effects are inspected when the microchannels both ends existence hindrance pressure.The results show that the section speed of flow reduces first and increases then when wall surface roughness width and gap increase in the microchannel.Section speed of flow reduces in non-linearity along with the relative roughness increase and the reducing tendency becomes slower with relative roughness value between 0.01% and 6%.When the relative roughness increases,the slope of pressure to the section speed reduces which means section speed of flow is not easily influenced by the pressure.