Jet printing of colloidal solutions – Numerical modeling and experimental verification of the influence of ink and surface parameters on droplet spreading

2011 ◽  
Vol 22 (2) ◽  
pp. 266-270 ◽  
Author(s):  
O. Schneider ◽  
Ph. Epple ◽  
E. Teuber ◽  
B. Meyer ◽  
M.P.M. Jank ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Experimental Verification ◽  
Colloidal Solutions ◽  
Droplet Spreading ◽  
Surface Parameters ◽  
Jet Printing

scholarly journals Numerical modeling and experimental verification of ductile damage in boron steel hot stamping process

2017 ◽  
Vol 207 ◽  
pp. 675-680
Author(s):  
Bingtao Tang ◽  
Chenchen Li ◽  
Guangchun Xiao ◽  
Wei Zhao ◽  
Huiping Li
Keyword(s):  
Numerical Modeling ◽  
Experimental Verification ◽  
Hot Stamping ◽  
Ductile Damage ◽  
Boron Steel ◽  
Stamping Process

scholarly journals Numerical modeling and experimental verification of through silicon via (TSV) filling in presence of additives

2014 ◽  
Vol 117 ◽  
pp. 8-12 ◽  
Author(s):  
Yunhui Zhu ◽  
Shenglin Ma ◽  
Xin Sun ◽  
Jing Chen ◽  
Min Miao ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Experimental Verification ◽  
Through Silicon Via

BEM Numerical Modeling and Experimental Verification of Cathodic Protection for Offshore Structures

2011 ◽  
Vol 339 ◽  
pp. 617-623
Author(s):  
Zhi Gang Lan ◽  
Bao Rong Hou ◽  
Xiu Tong Wang
Keyword(s):  
Numerical Modeling ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Computer Modeling ◽  
Cathodic Protection ◽  
Experimental Verification ◽  
Offshore Structures ◽  
Sacrificial Anode ◽  
Test Pool ◽  
Good Agreement

The progresses and theoretical methodology of computer modeling of cathodic protection using the boundary element method (BEM) are outlined. To test the effectiveness and accuracy of BEM numerical modeling of cathodic protection for offshore structures, a miniature model offshore jacket with a sacrificial anode was built and put in a test pool full of seawater. Cathodic protection potentials on different positions were measured and compared with the values obtained from computer modeling. The results show good agreement between measured value and numerical simulated value. The factors that led to discrepancy in the two groups of data were discussed.

A Model of Liquid-Drop Spreading for Electrohydrodynamic Jet Printing

2015 ◽  
Author(s):  
Christopher P. Pannier ◽  
Kira Barton ◽  
David Hoelzle ◽  
Zhi Wang
Keyword(s):  
High Resolution ◽  
Viscous Friction ◽  
Length Scale ◽  
Droplet Spreading ◽  
Loop Control ◽  
Electrohydrodynamic Jet Printing ◽  
Viscous Losses ◽  
Jet Printing ◽  
Base Radius ◽  
Small Disturbances

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.

scholarly journals Superconducting HfO2-YBa2Cu3O7−δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

Coatings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 17 ◽  
Author(s):  
Hannes Rijckaert ◽  
Pablo Cayado ◽  
Rainer Nast ◽  
Javier Diez Sierra ◽  
Manuela Erbe ◽  
...  
Keyword(s):  
Nanocomposite Films ◽  
Pinning Force ◽  
Colloidal Solutions ◽  
Ink Jet Printing ◽  
Drop On Demand ◽  
Ink Jet ◽  
Jet Printing ◽  
Printing Parameters ◽  
Critical Current Density Jc ◽  
Pinning Properties

To reduce the fabrication costs while maximizing the superconducting and pinning properties of YBa2Cu3O7−δ (YBCO) nanocomposite films, the drop-on-demand ink-jet printing technique was used to deposit colloidal YBCO inks onto LaAlO3 substrates. These inks containing preformed HfO2 nanocrystals were carefully adjusted, prior to the jettability, as the droplet formation depends on the rheological properties of the inks themselves. After carefully adjusting printing parameters, 450-nm thick pristine YBCO films with a self-field critical current density (Jc) of 2.7 MA cm−² at 77 K and 500-nm thick HfO2-YBCO nanocomposite films with a self-field Jc of 3.1 MA·cm−² at 77 K were achieved. The final HfO2-YBCO nanocomposite films contained dispersed BaHfO3 particles in a YBCO matrix due to the Ba2+ reactivity with the HfO2 nanocrystals. These nanocomposite films presented a more gradual decrease of Jc with the increased magnetic field. These nanocomposite films also showed higher pinning force densities than the pristine films. This pinning enhancement was related to the favorable size and distribution of the BaHfO3 particles in the YBCO matrix.

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