Search for: [Description = The PIV \(Particle Image Velocimetry\) method is one of the optical, non\-invasive measurement methods for measuring fluid velocity and can be used in the study of two\-phase gas\-liquid flows to determine velocity fields. The velocity distribution of the liquid and gas phases influences the formation of two\-phase flow structures and, consequently, the mechanisms of energy and moment exchange in the two\-phase flow. The article concerns the application of the PIV method to the assessment of hydrodynamic phenomena occurring during two\-phase flow realized in pipe minichannels with an internal diameter d > 2 mm. Fluorescent marker particles with a density close to that of water were used in the research. The preliminary tests were carried out on the adiabatic water\-air mixture. The research aimed to check the applicability of PIV methods also in non\-adiabatic flows. As a result of preliminary studies, velocity maps of the liquid phase, histograms and velocity profiles in the vertical section of the tested minichannel were obtained.]

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