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 | Nanotech 2007 Vol. 3
Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 3
Chapter 5: Micro and Nano Fluidics Design and Simulation |
| | Numerical Analysis of Nonlinear Deformation and Breakup of Slender Microjets with Application to Continuous Inkjet Printing | | Authors: | E.P. Furlani | | Affilation: | Eastman Kodak Company, US | | Pages: | 444 - 447 | | Keywords: | ink jet, ink jet printing, jet instability, slender jet analysis, jet breakup, jet modulation | | Abstract: | Liquid microjets are inherently unstable and can be modulated in a controlled fashion to create steady streams of picoliter-sized droplets at frequency rates in the hundreds of kilohertz. Such modulation has been achieved using CMOS/MEMS technology, which enables low-cost high-throughput droplet generators for applications that range from printed electronics to high-speed inkjet printing. The design of microfluidic printing devices requires rigorous and time-consuming CFD analysis. In this presentation we discuss a method for performing rapid parametric analysis of droplet generation that is useful for the design of such devices. We present a model for predicting the nonlinear deformation and breakup of modulated slender microjets. We adopt a one-dimensional slender-jet approximation and model the behavior of the jet using a system of coupled thermal/fluidic PDEs. We use the method of lines to reduce the PDEs to a system of ODEs, and solve for the free-surface, velocity, and temperature along the jet. We present parametric studies of jet breakup as a function of modulation amplitude and wavelength, and discuss how these parameters influence the time-to-breakup, the size of filaments, and the structure of the free surface at pinch-off. We also present a fabricated CMOS/MEMS inkjet printhead and describe its underlying device physics. | | ISBN: | 1-4200-6184-4 |
| Pages: | 732 |
| Hardcopy: | $199.99 |
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