One of the most challenging issues in the experimental investigation of interfacial area and its properties for two-phase flow in a micro-model is the visualization method. A micro-model is a micro-structure that represents a porous medium. The choice of the appropriate method depends on the dimensions of a micro-model and whether the experiments concern steady-state or dynamic effects. In the case of relatively small micro-models for steady-state or dynamic experiments, the use of a microscope in combination with a camera is the most effective method. When it comes to experiments where the micro-model is bigger than the optical frame of a microscope, the direct use of cameras is preferable. In this work, we present the visualization method for an elongated micro-model, with dimensions of the flow network of 1x10 mm2. The purpose of the experiment is the investigation of the role of fluid-fluid interfacial area in two-phase flow under dynamic conditions. Because of the dimensions of the micro-model, the use of a microscope is impossible without moving the micro-model. In our setup, four high resolution cameras with frame rate of 15 fps will be used. Each camera will cover an area of 1x1.7 mm2, thus a total area of 1x6.8 mm2 will be observed at any time. These cameras will record the distribution of phases. Then, with the aid of a computer and proper software, specific interfacial area and phase saturation will be determined as a function of time.


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