中文摘要：

为预测离心力作用下单位时间内流体在矩形微通道中的流动位移,对离心力作用下流体在矩形微通道中的流动机理进行理论分析.基于N-S方程建立了微流体的瞬态流动模型,得到矩形微通道内流体的压力分布、速度分布及其流动前端的位移变化规律,并对所建立的瞬态流动模型进行仿真分析,在仿真结果的基础上分析截面尺寸以及转速对流体的流动位移和横向速度的影响.结果表明,所建立的瞬态流动模型的计算结果与其仿真结果较吻合,能够较好地预测离心力作用下流体在矩形微通道中的位移变化规律.

英文摘要：

In order to solve the problem of delivery liquid to the desired position in Lab-on-a-CD systems,a theoretical model of transient flow including its analytic solution was proposed.The stress analysis of centrifugal microfluidic flows in rectangular microchannel was conducted.Based on the N-S equation,the analytical solution including the pressure distribution,velocity distribution and time-dependent behavior of the moving front was demonostrated.Meanwhile,the reasonable simulation method was established.Based on the simulation analysis,the influence of section size and speed of the displacement and the transverse velocity of flow was analyzed.The simulation data indicate that compared with the existing models,the proposed model is more reasonable to predict the flow displacement with time.