Electrohydrodynamic jet (E-jet) printing is a recent technique for high resolution additive micromanufacturing. With high resolution comes sensitivity to small disturbances, which has kept this technique from reaching its industrial potential. Closed loop control of E-jet printing can overcome these disturbances, but it requires an improved understanding of ink droplet spreading on the substrate and a physical model to predict printed feature locations and geometries from process inputs and disturbances. This manuscript examines a model of ink droplet spreading that uses assumptions that are important to the e-jet process. Our model leverages previous energy balance models that were derived for larger length scale droplets. At the smaller length scale, we find that viscous losses are a significant portion of the energy budget and must be accounted for; this is in contrast to models at length scales two orders of magnitude larger. Our model predicts the droplet height, base radius and contact angle in time from an initial volume and E-jet printing control parameters. The model is validated with published droplet spreading data and new measurements of E-jet printed droplets of diameter 8 μm. The viscous friction calculated in the new model is found to be significant compared to surface energy.
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ASME 2015 Dynamic Systems and Control Conference
October 28–30, 2015
Columbus, Ohio, USA
Conference Sponsors:
- Dynamic Systems and Control Division
ISBN:
978-0-7918-5725-0
PROCEEDINGS PAPER
A Model of Liquid-Drop Spreading for Electrohydrodynamic Jet Printing
Christopher P. Pannier,
Christopher P. Pannier
University of Michigan, Ann Arbor, MI
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Kira Barton,
Kira Barton
University of Michigan, Ann Arbor, MI
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David Hoelzle,
David Hoelzle
University of Notre Dame, Notre Dame, IN
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Zhi Wang
Zhi Wang
University of Notre Dame, Notre Dame, IN
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Christopher P. Pannier
University of Michigan, Ann Arbor, MI
Kira Barton
University of Michigan, Ann Arbor, MI
David Hoelzle
University of Notre Dame, Notre Dame, IN
Zhi Wang
University of Notre Dame, Notre Dame, IN
Paper No:
DSCC2015-9995, V002T34A012; 10 pages
Published Online:
January 12, 2016
Citation
Pannier, CP, Barton, K, Hoelzle, D, & Wang, Z. "A Model of Liquid-Drop Spreading for Electrohydrodynamic Jet Printing." Proceedings of the ASME 2015 Dynamic Systems and Control Conference. Volume 2: Diagnostics and Detection; Drilling; Dynamics and Control of Wind Energy Systems; Energy Harvesting; Estimation and Identification; Flexible and Smart Structure Control; Fuels Cells/Energy Storage; Human Robot Interaction; HVAC Building Energy Management; Industrial Applications; Intelligent Transportation Systems; Manufacturing; Mechatronics; Modelling and Validation; Motion and Vibration Control Applications. Columbus, Ohio, USA. October 28–30, 2015. V002T34A012. ASME. https://doi.org/10.1115/DSCC2015-9995
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