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Experimental measurement of the distribution of the diameter of water droplets in the spray generated by the nozzle based on the RU effect

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The paper presents the results of measuring the distribution of the droplet diameters in the nebulization generated by the nozzle at the values of the pressure of the supplied water of interest based on the interference method for recording the Ml-scattering of laser radiation on droplets. Studies were carried out on the nozzle with cold filtered tap water supply under pressure. In total, three experiments were carried out with a pressure of 10, 14 and 18 bar.The nozzle was located in a closed container with transparent walls measuring 40x60x120 cm3 (capacity - rectangular parallelepiped) approximately in the center of the inner volume of the container. The need to locate the object of research in a closed container is due to the sensitivity of electronic equipment to moisture. Outside the container there were optical devices: laser optics forming optics and a video camera with a macro lens. The maximum speed (modulo) is practically independent of the pressure and is 8.5 m/s at a distance of 15 cm from the nozzle outlet. This can be explained by the fact that the drop undergoes strong resistance to movement from the air side in the tank. The Stokes resistance force, proportional to the speed, quickly brakes the drop, so that by the time the droplet arrives in the imaging area, its speed decreases dramatically. With an increase in pressure from 10 to 18 bar, the average diameter of the spray nozzles of the nozzle increases from 17.3 to 20 μm.

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