Experimental study on formation mechanism of main droplets and elimination method of satellite droplets in jet process

Abstract

In certain industries, such as the Chinese pharmaceutical pill preparation medicines, the occurrence of satellite droplets and the inconsistent diameters of the main droplets lead to wasted resources and affect the normal operation of the production system. So it is necessary to investigate the formation process of main droplets and the elimination method of satellite droplets in the jet process. In this paper, the effects of the liquid level height, dropper inner diameter, and glycerin mass fraction on the formation of the droplets are revealed, and the optimal frequency for eliminating satellite droplets is explored. The results show that the diameter of the main droplets increases as the liquid level height and the dropper inner diameter increase and decreases as the glycerin mass fraction increases. The fracture length has a growing trend as the liquid level, dropper inner diameter, and glycerin mass fraction increase. With the increase in the dropper inner diameter and glycerin mass fraction, the generation period increases. However, the increase in the liquid level height has an opposite influence on the other parameters. The optimal frequency for eliminating satellite droplets increases as the liquid level height and dropper inner diameter increase and decreases as the liquid becomes more viscous. However, the diameter and generation period of the main droplets decrease when a longitudinal disturbance is added to the jet system.

Inkjet printing quality improvement research progress: A review

“…Runze et al performed experiments with a 50 % glycerol-water solution and observed that applying longitudinal disturbances at a frequency of 84Hz induced asymmetry in the droplet's shape, resulting in oscillations and distortion. However, during the entire process, only one breakage occurred, and no satellite droplets were generated [ 56 ]. Oke Oktavianty et al conducted a comparison between the basic waveform, W-shaped pulses, and enhanced W-shaped pulse waveforms.…”