Publications by authors named "Sean R Niemi"

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Stability of High Speed 3D Printing in Liquid-Like Solids.

ACS Biomater Sci Eng 2016 Oct 31;2(10):1796-1799. Epub 2016 Aug 31.

Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, United States.

Fluid instabilities limit the ability of features to hold their shape in many types of 3D printing as liquid inks solidify into written structures. By 3D printing directly into a continuum of jammed granular microgels, these instabilities are circumvented by eliminating surface tension and body forces. However, this type of 3D printing process is potentially limited by inertial instabilities if performed at high speeds where turbulence may destroy features as they are written. Here, we design and test a high-speed 3D printing experimental system to identify the instabilities that arise when an injection nozzle translates at 1 m/s. We find that the viscosity of the injected material can control the Reynold's instability, and we discover an additional, unanticipated instability near the top surface of the granular microgel medium.
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http://dx.doi.org/10.1021/acsbiomaterials.6b00184DOI Listing
October 2016
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