【摘要】 借助微流控技术和数值模拟,设计了一套通过观测流体流场确定流体流变性的实验体系。实验结果表明:实际流场分布与模拟结果基本吻合,所测得的平均流速为74.84μm/s,和实验设定75μm/s接近,且计算所得的动力黏度值与参考值相符;所测油品在不同温度下的流场皆与模拟曲线相吻合,说明该实验测定流体黏度精确度高;得到了较大温度范围内流变性的定量变化规律,所测油品皆在低于300K时油品的动力黏度随温度降低呈指数性增长。该方法简单可行、准确度高,适用于相关学科的本科教学实验。更多还原

【Abstract】 By means of microfluidic technology and numerical simulation,an experimental system is designed to determine the rheological properties of the fluid by observing the fluid flow field.The experimental results show that the real velocity distribution is basically identical to the simulation result,the measured mean velocity of 74.84μm/s is close to the set value of 75μm/s,the calculated dynamic viscosity is consistent with the reference value,and the flow field of the measured oil under different temperatures is in agreement with the simulation curve,meaning that the experiment has good accuracy in the determination of viscosity,and obtaining quantitative variation law of the rheological properties over a wide temperature range.When the measured oil temperature is lower than 300 K,the dynamic viscosity of the oil increases exponentially with decreasing temperature. This method is easy,feasible and highly accurate,and is suitable for the undergraduate teaching experiment in the related subjects of Fluid Mechanics.更多还原