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要充分理解并利用微流体系统中流体的流动,需要对流体的动态特性有全面的了解。目前,流感与流阻的计算已经被大家熟知,可流容的计算仍是一个难点。本文设计了一个微流体流容器件,提出了测量微流体系统流容特性的方法。流容器件由圆形截面的一段玻璃管和一段弹性管组成。基于微流体等效电路理论我们对器件模型进行分析,仿真实验了系统在恒压和动态压强下不同的响应情况。利用恒压驱动的衰减振荡结果拟合出弹性流道的流容值,并与动态压强输入模型的共振响应结果进行了对比验证。结果证明,仿真结果与理论分析一致,拟合的流容值正确,提出的分析方法正确。整个模型的动态响应特性与电路中的带通滤波器类似。
To fully understand and utilize the fluid flow in a microfluidic system requires a thorough understanding of the fluid dynamic properties. Currently, the calculation of flu and flow resistance has been well known, and the calculation of flow capacity is still a difficult task. In this paper, a microfluidic flow capacity device is designed and a method to measure the flow capacity of the microfluidic system is proposed. The flow device consists of a section of glass tube and a section of elastic tube with a circular section. Based on the theory of microfluidic equivalent circuit, we analyze the device model and simulate the different response of the system under constant pressure and dynamic pressure. The flow capacity value of the elastic flow channel is fitted by the decay oscillation result driven by the constant pressure and compared with the resonance response of the dynamic pressure input model. The results show that the simulation results are in good agreement with the theoretical analysis, and the fitted flow values are correct and the analysis methods proposed are correct. The dynamic response of the entire model is similar to the bandpass filter in the circuit.