drop formation – TechConnect Briefs

Micro Solid Oxide Fuel Cell Fabrication via Inkjet Printing

Hill T.Y., Reitz T.L., Huang H., Air Force Research Laboratory, US

Energy conversion and storage devices (ECSDs) are facing the challenge of manufacturing miniature dimensions and/or unconventional shapes. Furthermore, reducing the total device thickness can significantly reduce the internal resistance and potentially improve interfacial electrochemical kinetics [...]

Modeling Drop Generation at the Microscale

Hanchak M.S., Furlani E.P., Eastman Kodak Company, US

In this presentation a numerical model is described for predicting drop generation from microscale liquid jets of Newtonian fluid. The model uses a one-dimensional slender-jet approximation to obtain the equations of motion for the free-surface [...]

Methods & Results from the Cambridge Inkjet Research Centre

Hoath S.D., Martin G.D., Hutchings I.M., University of Cambridge UK, UK

We outline the methods and tools of fluid characterization, drop visualization and drop formation physics that are used at Cambridge. We present recent results and interpretation for drop on demand inkjet printing of some model [...]

Curvilinear Waveforms for Fluid Dispensing

Clark J., Zebra Technologies, US

Piezoelectric micropipettes, a type of drop -on-demand ink jet microdispenser, are typically driven by repetitively pulsed waveforms to cause fluid ejection through a small orifice. To study the effect of drive waveform shape on drop [...]

Drop formation mechanisms in piezo-acoustic inkjet

Wijshoff H.M.A., Océ Technologies B.V., NL

Drops are generated with a piezo inkjet device. A piezo actuator drives each channel. Drops are measured with stroboscopic illumination or high-speed camera recordings. The phenomena inside the channels are hard to measure. Modeling give [...]

Free Surface Flow and Acousto-Elastic Interaction in Piezo Inkjet

Wijshoff H., Océ Technologies B.V., NL

Modeling plays an essential role in our research on new inkjet technologies. Structural modeling with Ansys includes piezo-electricity. Acoustic modeling in Ansys and Matlab involves fluid-structure interaction. CFD modeling with Flow3D includes wall-flexibility and free [...]

Surface Tension Induced Instability of Viscous Liquid Jets

Furlani E.P., Delametter C.N., Chwalek J.M., Trauernicht D., Eastman Kodak Company, US

Viscous liquid jets are inherently unstable, and drop formation can be induced by various means including surface tension modulation. Furthermore, surface tension is temperature dependent, and can be modulated by locally heating the surface of [...]