Two–phase flows appear in many industrial and biomedical applications. One of the most vital biomedical applications of two–phase flows is in hemodialysis machines due to air embolism and heparin injection. Since these flows have a very complex and intermittent nature, studying their dynamics is a very challenging and fundamental problem. The purpose of this article is to present an experimental study on the dynamics of two–phase peristaltic slug flows. The measurement strategy is based on the image processing technology. The characteristic parameters of the two–phase pulsatile slug flows, including the slug length, as well as the translational velocity and frequency of the slug motion, are measured, and the effect of the liquid flow rate and liquid superficial velocity is investigated. The results show that the average and maximum slug velocities, and also the dominant amplitude of the slug velocity increase with the flow rate and liquid superficial velocity, while it is not possible to clearly predict a correlation between the liquid superficial velocity and the slug length. The measurement strategy presented in this article can be used in the control and alarm systems of smart dialysis machines.

两相流出现在许多工业和生物医学应用中。由于空气栓塞和肝素注射，两相流最重要的生物医学应用之一是在血液透析机中。由于这些流具有非常复杂和断断续续的性质，因此研究其动力学是一个非常具有挑战性和根本的问题。本文的目的是对两相蠕动塞流的动力学进行实验研究。测量策略基于图像处理技术。测量了两相脉动塞流的特征参数，包括塞长，塞运动的平移速度和频率，并研究了液体流速和液体表观速度的影响。结果表明，平均和最大弹头速度，并且，块状速度的主要振幅随流速和液体表观速度而增加，而不可能清楚地预测液体表层速度与块状长度之间的相关性。本文介绍的测量策略可用于智能透析机的控制和报警系统。