Breakup length determination of continuous ink jets: Application to a shear-thinning industrial fluid

Abstract

The theory of the so-called Rayleigh–Plateau instability of fluid jets has been widely studied and can be used to predict the breakup length of liquid jets. Recently, in the work of Rosello et al. [J. Fluids Eng. 140(3), 031202 (2018)], the linear theory was enhanced to accurately predict the breakup length of continuous ink jets of Newtonian fluids by accounting for the influence of the nozzle geometry. In the present work, the influence of a shear-thinning behavior is addressed for both the breakup morphologies and breakup lengths in a linear regime. A comparison with the experimental data shows an excellent agreement extending the model of Rosello et al. to a non-Newtonian shear-thinning fluid.

Dataset of numerically-generated interfaces of Newtonian jets in CIJ regime

“…The experimental results have an Ohnesorge number , corresponding to in the present dataset. Although the numerical inlet velocity is different from the experimental one, it has been showed in [8] , [9] that, until a moderate amplitude of stimulation, the jet morphology is not influenced by the nozzle geometry.

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“…The present numerical results is compared Fig. 6 to experimental ones from [8] . The experimental results have an Ohnesorge number , corresponding to in the present dataset.…”

Accelerating Effects of Flow Behavior Index n on Breakup Dynamics for Droplet Evolution in Non-Newtonian Fluids

“…As the shear-thinning fluid was the dispersed phase, the breakup behavior of it was similar to those of the Newtonian fluid [12][13][14][15], but their difference were the breakup time, micro-droplet size, and satellite micro-droplet state [16]. The viscosity of shearthinning fluid varies with shear rate, thus affecting the micro-droplet breakup.…”