An experimental study of liquid droplet shape detaching from a cylindrical nozzle
R.A. Dekhtyar, E.Yu. Sukhorukova
S.S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: nozzle, jet, droplet detachment
Abstract
An experimental study of the dynamics of liquid droplet formation and detachment in a periodic drip regime was conducted using tubes with an outer diameter ranging from 0.5 to 4 mm. Water, ethanol, a 40% aqueous ethanol solution, and glycerol were used as working fluids, allowing for a wide range of physicochemical properties (viscosity, surface tension, density) to be covered. Analysis of the droplet shape dynamics revealed a three-stage cyclic process. Dimensionless parameters were used for the analysis, allowing for a comparison of experimental data obtained under different operating conditions. It was found that throughout the entire period of droplet formation, a jet flow region with a liquid flow rate lower than that through the nozzle develops in the central region. This leads to the droplet separation into two parts-an upper and a lower part. The lower droplet is separated directly from the forming jet. However, the characteristics of this process differ significantly from similar droplet detachment processes under chaotic droplet conditions.
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