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Research Papers: Fundamental Issues and Canonical Flows

Influence of the Nozzle Shape on the Breakup Behavior of Continuous Ink Jets

[+] Author and Article Information
Maxime Rosello, Guillaume Maîtrejean, Denis C. D. Roux, Pascal Jay

Laboratoire Rhéologie et Procédés,
Université Grenoble Alpes,
CNRS, LRP,
Grenoble F-38000, France

Bruno Barbet

Markem-Imaje Industries,
ZA de l'Armailler,
9, rue Gaspard Monge,
Bourg-Lés-Valence 26501, France

Jean Xing

Markem-Imaje Industries, ZA de l'Armailler, 9, rue Gaspard Monge, Bourg-Lés-Valence 26501, France

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 18, 2016; final manuscript received August 8, 2017; published online October 19, 2017. Assoc. Editor: Kwang-Yong Kim.

J. Fluids Eng 140(3), 031202 (Oct 19, 2017) (8 pages) Paper No: FE-16-1755; doi: 10.1115/1.4037691 History: Received November 18, 2016; Revised August 08, 2017

In this work, the influence of nozzle shape on microfluidic ink jet breakup is investigated. First, an industrial ink used in continuous inkjet (CIJ) printing devices is selected. Ink rheological properties are measured to ensure an apparent Newtonian behavior and a constant surface tension. Then, breakup lengths and shapes are observed on a wide range of disturbance amplitude for four different nozzles. Later on, ink breakup behaviors are compared to the linear theory. Finally, these results are discussed using numerical simulations to highlight the influence of the velocity profiles at the nozzle outlet. Using such computations, a simple approach is derived to accurately predict the breakup length for industrial CIJ nozzles.

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Copyright © 2018 by ASME
Topics: Nozzles , Shapes , Inks , Fluids
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References

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Figures

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Fig. 1

Experimental setup for drop generation and visualization

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Fig. 2

Nozzle design used for the present study

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Fig. 3

Dynamic viscosity of ink as a function of the shear rate

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Fig. 4

Breakup length as a function of disturbance amplitude for various nozzle designs

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Fig. 5

Breakup shapes obtained for different nozzles: (a) N1, (b) N2, (c) N1, and (d) N1

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Fig. 7

Comparison between experimental breakup length and analytical predictions in the linear regime. The analytical prediction is in filled thin line.

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Fig. 8

Axial velocity profiles at the nozzle exit obtained using numerical simulations

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Fig. 9

Radial velocity profiles at the nozzle exit obtained using numerical simulations

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Fig. 10

Axial velocities at the center of the jet and near the interface along the jet obtained using numerical simulations

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Fig. 11

Comparison between the experimental results (markers) and breakup length predictions (solid lines) from Eq.(14)

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