Effects of Drive Amplitude on Continuous Jet Break-up

Mcilroy, Claire; Harlen, Oliver G.

Abstract

We develop a one-dimensional (1D) model of jet break-up in continuous inkjet printing to explore the non-linear behaviour caused by finite-amplitude modulations in the driving velocity, where jet stability deviates from classic (linear) 'Rayleigh' behaviour. At low driving amplitudes and high Weber numbers the spatial instability produces drops that pinch-off downstream of the connecting filament, leading to the production of small satellite droplets between the main drops. On the other hand, we identify a range of driving amplitudes where pinching becomes 'inverted', occurring upstream of the filament connecting the main drops, rather than downstream. This inverted break-up is preferable in printing, as it increases the likelihood of satellite drops merging with the main drops. We find that this behaviour can be controlled by the addition of a second harmonic to the driving signal. This model is in quantitative agreement with a full axisymmetric simulation, which incorporates nozzle geometry.

Citation

Mcilroy, C., & Harlen, O. G. (2019). Effects of Drive Amplitude on Continuous Jet Break-up. Physics of Fluids, 31(6), https://doi.org/10.1063/1.5099016

• Journal Article Type: Article
• Acceptance Date: May 30, 2019
• Online Publication Date: Jun 19, 2019
• Publication Date: 2019-06
• Deposit Date: Jun 14, 2019
• Publicly Available Date: Jun 20, 2020
• Journal: Physics of Fluids
• Print ISSN: 1070-6631
• Electronic ISSN: 1089-7666
• Publisher: AIP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Issue: 6
• Article Number: 064104
• DOI: https://doi.org/10.1063/1.5099016
• Keywords: Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/2188782
• Publisher URL: https://aip.scitation.org/doi/10.1063/1.5099016
• Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at https://aip.scitation.org/doi/10.1063/1.5099016