Acta Mechanica Slovaca 2025, 29(4):36-43 | DOI: 10.21496/ams.2026.005

Vibration-Controlled Jet Breakup for Monodisperse Droplet Formation in a Rotating Granulation System

Dmitry Zabitsky¹, Ruslan Ostroha^{1, *}

Sumy State University, 116, Kharkivska St., 40007, Sumy, Ukraine

This study examines vibration-controlled jet breakup and its role in droplet formation in a rotating granulation system. A 2² full factorial experimental design was used to evaluate the combined influence of actuator position (5/30 mm) and liquid column height (120/450 mm) on the forced vibration regime. A regression model confirmed the presence of structural-dynamic interaction between these parameters. Experimental observations showed that stable monodisperse droplets were obtained at a liquid column height of 380 mm, vibration frequency of 380 Hz, and amplitude of 100 µm, where periodic pinch-off occurred without satellite droplets. Reducing the liquid height to 280 mm and lowering the excitation frequency to 220 Hz led to satellite droplet formation, while a regime of 800 Hz and 50 µm amplitude resulted in polydisperse breakup. The results show that monodispersity is achieved only within a limited combination of structural configuration and vibration parameters, providing a basis for optimizing vibration-assisted granulation processes.

Keywords: oscillatory forcing, droplet formation dynamics, size distribution control, vibration tuning, granule uniformity, hydrodynamic response, parametric interaction, process optimization.

Received: February 11, 2026; Revised: February 11, 2026; Accepted: February 16, 2026; Published: December 15, 2025  Show citation