We conducted volume of fluids (VOF) multiphase model numerical simulations to obtain the interaction among all the major governing forces identified in our previous paper. Our numerical experiments are intended to assess the droplet generation process and the jetting behavior by providing specific input conditions, offering CFD as a tool to study scaling correlations instead of physical experiments. Water droplets that can represent waterborne paints were generated by piezo-generated sinusoidal waveforms at the inlet of the nozzle. The governing forces included the external piezo-based wave-generation force, the inertial force of droplets, the inertial force of air, the viscose force of air acting on droplet surface, the viscous force of liquid, and surface tension force of droplets. The law approach-based scaling theory was applied to explain the significance of traditional pi-numbers, such as the Reynolds number, Strouhal number, Weber number, Capillary number, and Ω, in predicting the performance of the inkjet nozzle before introducing the operating conditions.
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Arabghahestani, Masoud; Akafuah, Nelson; Li, Tianxiang; and Saito, Kozo
"A CFD-based scaling analysis on liquid and paint droplets moving through a weak concurrent airflow stream,"
Progress in Scale Modeling, an International Journal: Vol. 3:
1, Article 3.
Available at: https://uknowledge.uky.edu/psmij/vol3/iss1/3