微流控装置中牛顿液体的稳态流动粘度
Steady streaming viscometry of Newtonian liquids in microfluidic devices
摘要：
我们报道了一种新的技术，能够测量牛顿流体的运动剪切粘度与稳定流动的微流控装置。这种无探针的微流变方法利用圆柱形障碍物周围的亚千赫兹液体振荡频率，确保内部流动层的大小与圆柱体半径相当。为了校准粘度计，使用标准粒子跟踪技术表征作为已知粘度的液体的振荡频率的函数的内部流动层的演变。一旦校准，我们展示了如何稳定流动粘度计可用于测量低粘度液体和挥发性液体。
英文摘要：
We report a novel technique capable of measuring the kinematic shear viscosity of Newtonian liquids with steady streaming in microfluidic devices. This probe-free microrheological method utilizes sub-kilohertz liquid oscillation frequencies around a cylindrical obstacle, ensuring that the inner streaming layer is comparable in size to the cylinder radius. To calibrate the viscometer, the evolution of the inner streaming layer as a function of oscillation frequency for a liquid of known viscosity is characterized using standard particle tracking techniques. Once calibrated, we show how the steady streaming viscometer can be used to measure low-viscosity liquids and volatile liquids.
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