2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Numerical Analysis of Nonlinear Deformation and Breakup of Slender Microjets with Application to Continuous Inkjet Printing

E.P. Furlani
Eastman Kodak Company, US

ink jet, ink jet printing, jet instability, slender jet analysis, jet breakup, jet modulation

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.

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Nanotech 2007 Conference Program Abstract


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