In this study, we present a 1D method to predict the droplet ejection of a drop-on-demand (DoD) inkjet which includes the drop breakup, coalescence, and the meniscus movement at nozzle orifice. A simplified 1D slender-jet analysis based on the lubrication approximation is used to study the drop breakup. In this model, the free-surface (liquid-air interface) is represented by a shape function so that the full Navier-Stokes (NS) equations can be linearized into a set of simple partial differential equations (PDEs) which are solved by method of lines (MOL). The shape-preserving piecewise cubic interpolation and third-order polynomial curve are employed to merge approaching droplets smoothly. The printhead is simplified into a circular tube, and a 2D axisymmetric unsteady Poiseuille flow model is adopted to acquire the relationship between the time-dependent driving pressure and velocity profile of the meniscus. Drop breakup and meniscus movement are coupled together by a threshold of meniscus extension to complete a full simulation of droplet ejection. These algorithms and simulations are carried out using MATLAB code. The result is compared with a high fidelity 2D simulation which was previously developed [10], and good agreement is found. This demonstrates that the proposed method enables rapid parametric analysis of DoD inkjet droplet ejection as a function of nozzle dimensions, driving pressure and fluid properties.
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ASME 2017 International Mechanical Engineering Congress and Exposition
November 3–9, 2017
Tampa, Florida, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5845-5
PROCEEDINGS PAPER
One Dimensional Simulation of Droplet Ejection of Drop-on-Demand Inkjet
Huicong Jiang,
Huicong Jiang
Washington State University, Vancouver, WA
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Hua Tan
Hua Tan
Washington State University, Vancouver, WA
Search for other works by this author on:
Huicong Jiang
Washington State University, Vancouver, WA
Hua Tan
Washington State University, Vancouver, WA
Paper No:
IMECE2017-71190, V010T13A030; 10 pages
Published Online:
January 10, 2018
Citation
Jiang, H, & Tan, H. "One Dimensional Simulation of Droplet Ejection of Drop-on-Demand Inkjet." Proceedings of the ASME 2017 International Mechanical Engineering Congress and Exposition. Volume 10: Micro- and Nano-Systems Engineering and Packaging. Tampa, Florida, USA. November 3–9, 2017. V010T13A030. ASME. https://doi.org/10.1115/IMECE2017-71190
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