scholarly journals A High Temperature Drop-On-Demand Droplet Generator for Metallic Melts

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 477 ◽  
Author(s):  
Saeedeh Imani Moqadam ◽  
Lutz Mädler ◽  
Nils Ellendt
Keyword(s):  
High Speed ◽  
Temperature Drop ◽  
Pressure Oscillation ◽  
Ex Situ ◽  
Droplet Generator ◽  
On Demand ◽  
Micro Particles ◽  
Drop On Demand ◽  
Aisi 52100 Steel ◽  
Size And Morphology

In this study we present the design and functionality of a pneumatic drop-on-demand droplet generator that produces metallic micro particles with a size range of 300 µm to 1350 µm at high temperatures of up to 1600 °C. Molten metal droplets were generated from an EN 1.3505 (AISI 52100) steel which solidified during a falling distance of 6.5 m. We analyzed the resulting particle size and morphology using static image analysis. Furthermore, the droplet formation mode was analyzed using high-speed recordings and the pressure oscillation was measured in the crucible. The system is meant to be reproducible in all aspects and therefore the in-situ measurements are set to control the droplet size and trajectory during the run. Additionally, the ex-situ measurements are done on the particles in order to characterize them in size and morphology aspects.

scholarly journals High Speed Roll-to-Roll Printable Transistor Enabled by a Pulsed Light Curable CNT Ink

2019 ◽  
Vol 3 (2) ◽  
pp. 33
Author(s):  
Peter Mack Grubb ◽  
Farzad Mokhtari Koushyar ◽  
Travis Lenz ◽  
Aref Asghari ◽  
Gongwen Gan ◽  
...  
Keyword(s):  
High Speed ◽  
Flash Lamp ◽  
Pulsed Light ◽  
Production Methods ◽  
On Demand ◽  
Roll To Roll ◽  
Drop On Demand ◽  
Visible Light Range ◽  
Strong Energy ◽  
Triton X

This paper reports the first high speed roll-to-roll printable transistor using a carbon nanotube (CNT) semiconducting layer. The transistor is made possible through the development of a pulsed light curable CNT ink compatible with typical drop on demand inkjet cartridges. This CNT ink uses a xylene based solvent with methanol, glycerin, and Triton X-100 modifiers to create an evaporable solution with appropriate absorption spectra for a mercury or xenon flash lamp with strong energy transmission in the UVB to mid visible light range, allowing the solution to absorb the energy from the flash lamp and evaporate. Transistor dimensions were defined by the capabilities of a typical roll-to-roll drop on demand cartridge. The final device demonstrated an on/off ratio of 104, representing performance similar to gravure printed devices. This represents the first CNT ink which can be used in high speed production methods without long thermal curing steps in the workflow.

A Piezoelectric Droplet Generating Device for Experiment in Successive Droplets Impacting Onto Solid Surface

2018 ◽  
Author(s):  
Jianxin Li ◽  
Huang Zhang ◽  
Yuzheng Li ◽  
Qianfeng Liu ◽  
Hanliang Bo
Keyword(s):  
Solid Surface ◽  
High Speed ◽  
Experimental Studies ◽  
Structure Design ◽  
Nozzle Diameter ◽  
Signal Frequency ◽  
Duty Ratio ◽  
Droplet Generator ◽  
Uniform Size ◽  
Drop On Demand

The outcomes of successive droplets impacting onto solid surface of the steam separator in a nuclear power system’s steam generator has a strong effect on the separating efficiency. Due to amounts of influencing factors, experimental research is an important method to study the phenomena of droplet-wall collision. However, because it is hard to generator continuous droplets with controllable uniform size and frequency, experimental studies about successive droplets impacting on solid surface are relative limited. In this study, a novel drop-on-demand (DOD) droplet generator is designed and fabricated based on piezoelectric ceramics, in which successive droplets with a uniform diameter can be generated. Firstly, the structure design of the DOD droplet generator, the setup of the control system and working principle are described in detail in this paper. Then the droplet generating performance of the device under different signal frequency fs, signal amplitude U, duty ratio Dr, and nozzle diameter Dn are investigated experimentally using a high-speed camera at 4000 fps. Finally, the influence of the signal frequency fs, voltage U, duty ratio Dr and nozzle diameter Dn on the diameter of droplet Dd is discussed. A test of successive droplets generated by the device impacting on an aluminum plate is conducted.

scholarly journals High-speed laser speckle imaging to unravel picoliter drop-on-demand to substrate interaction

2021 ◽  
Vol 92 (8) ◽  
pp. 083906
Author(s):  
R. Antonelli ◽  
R. Fokkink ◽  
N. Tomozeiu ◽  
J. Sprakel ◽  
T. E. Kodger
Keyword(s):  
High Speed ◽  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
On Demand ◽  
Substrate Interaction ◽  
Drop On Demand

scholarly journals Development of a drop-on-demand droplet generator for one-drop-fill technology

2008 ◽  
Vol 147 (2) ◽  
pp. 649-655 ◽  
Author(s):  
Kuang-Chao Fan ◽  
Jhih-Yuan Chen ◽  
Ching-Hua Wang ◽  
Wen-Chueh Pan
Keyword(s):  
Droplet Generator ◽  
On Demand ◽  
Drop On Demand

Development of a Piezoelectric-Actuated Drop-on-Demand Droplet Generator Using Adaptive Wavelet Neural Network Control Scheme

2014 ◽  
Vol 625 ◽  
pp. 615-620
Author(s):  
Jin Wei Liang ◽  
Hung Yi Chen
Keyword(s):  
Neural Network ◽  
Adaptive Learning ◽  
Tracking Error ◽  
Open Loop ◽  
Wavelet Neural Network ◽  
Network Control ◽  
Droplet Generator ◽  
Adaptive Wavelet ◽  
On Demand ◽  
Drop On Demand

This paper presents the design, fabrication and control of a piezoelectric-type droplet generator which is applicable for on-line dispensing. The piezoelectric-actuated dispensing system consists of a linear piezoelectric motor (LPM) actuated table, a plastic syringe, a nozzle, a linear encoder and a PC-based control unit. Adaptive wavelet neural network (AWNN) control is applied to overcome nonlinear hysteresis inherited in the LPM. The adaptive learning rates are derived based on the Lyapunov stability theorem so that convergence of the tracking error can be assured. Unlike open-loop dispensing system, the system proposed can potentially generate droplets with high accuracy. Experimental verifications including regulating and tracking control are performed firstly to assure the reliability of the proposed control schemes. Real dispensing is then conducted to validate the feasibility of the piezoelectric-actuated drop-on-demand droplet generator. The results demonstrate that the proposed scheme works well in developing the piezoelectric-actuated drop-on-demand dispensing system.

High-speed and drop-on-demand printing with a pulsed electrohydrodynamic jet

2010 ◽  
Vol 20 (9) ◽  
pp. 095026 ◽  
Author(s):  
S Mishra ◽  
K L Barton ◽  
A G Alleyne ◽  
P M Ferreira ◽  
J A Rogers
Keyword(s):  
High Speed ◽  
On Demand ◽  
Drop On Demand

Fabrication of multi-scale micro-lens arrays on hydrophobic surfaces using a drop-on-demand droplet generator

2015 ◽  
Vol 66 ◽  
pp. 156-165 ◽  
Author(s):  
Xiaoyang Zhu ◽  
Li Zhu ◽  
Hejuan Chen ◽  
Mei Yang ◽  
Weiyi Zhang
Keyword(s):  
Droplet Generator ◽  
Hydrophobic Surfaces ◽  
Multi Scale ◽  
On Demand ◽  
Drop On Demand ◽  
Micro Lens
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