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Modelling of Power-Law Fluid Flow Inside a Piezoelectric Inkjet Printhead.

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  • 1Key Laboratory of Electronic Equipment Structure Design, Xidian University, Ministry of Education, Xi'an 710071, China.

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Summary

This study presents a new model for shear-thinning inks in piezoelectric inkjet printing. The model helps control ink flow for consistent 3D printing of complex objects.

Keywords:
equivalent circuit modelnon-Newtonian fluidspiezoelectric three-dimensional inkjet printingpower-law fluid

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Manufacturing Engineering

Background:

  • Piezoelectric 3D inkjet printing offers high flexibility for heterogeneous object manufacturing.
  • Non-Newtonian inks with complex rheological properties are used, but their behavior in inkjet printing, particularly shear-thinning viscosity's effect on droplet generation, is not fully understood.
  • A control strategy is needed to manage shear-thinning effects for consistent printing.

Purpose of the Study:

  • To present a novel model-based approach for describing shear-thinning ink dynamics within piezoelectric inkjet printheads.
  • To provide a basis for systematically designing excitation parameters for printing control.
  • To ensure printing consistency despite complex ink rheology.

Main Methods:

  • Developed a quasi-one-dimensional dynamic equation by combining boundary layer theory and the power-law fluid constitutive equation.
  • Presented a nonlinear time-varying equivalent circuit model to simulate power-law fluid flow rate in the printhead tube.
  • Validated the model using computational fluid dynamics (CFD) and experimental results.

Main Results:

  • Successfully modeled the shear-thinning ink dynamics in piezoelectric inkjet printing.
  • The equivalent circuit model accurately simulates fluid flow rate.
  • Model feasibility and effectiveness were confirmed through comparison with CFD and experimental data.

Conclusions:

  • The presented model-based approach effectively describes shear-thinning ink behavior in piezoelectric inkjet printing.
  • This provides a systematic method for designing printing parameters to achieve consistent droplet generation and high-quality 3D printing.
  • The model serves as a valuable tool for understanding and controlling complex fluid dynamics in advanced manufacturing processes.