Numerical Study on the Electrohydrodynamic Jet Printing

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Xue Yang ◽  
Shuobang Wang ◽  
Zhifu Yin ◽  
Jili Wang ◽  
Wei Hu
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Formation Process ◽  
High Efficiency ◽  
Numerical Study ◽  
Low Cost ◽  
Element Model ◽  
Jet Formation ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing

Abstract Electrohydrodynamic (EHD) printing is an alternative method to fabricate high-resolution micro- and nanostructures with high efficiency, low cost, and low pollution. Numerical simulation is an effective approach to systematically investigate the formation process of EHD jet. However, there are a few articles performing this work. In this study, a finite element model was established. The jet formation process and jetting modes were analyzed. The influence of applied voltage and printing distance on the maximum electric field near the nozzle tip was investigated. The effect of flow rate on the jet diameters was studied. Comparison between numerical and experimental results demonstrated that the proposed simulation model had a high potential for EHD jet analysis. According to the optimized printing conditions (printing distance of 200–300 μm, applied voltage of ∼1100 V, and flow rate of 0.1–0.3 ml/h), stable EHD jet can generate and polyvinyl pyrrolidone (PVP) lines with minimum line-width of 0.9 μm can be printed onto the glass slide.

scholarly journals Experimental Study and High-Efficiency Simulation of In-Plane Behavior of Composite Frame Slab

2021 ◽  
Author(s):  
Wen-Hao Pan ◽  
Mu-Xuan Tao ◽  
Chuan-Hao Zhao ◽  
Ran Ding ◽  
Li-Yan Xu
Keyword(s):  
Experimental Study ◽  
Failure Mode ◽  
High Efficiency ◽  
Numerical Study ◽  
Element Model ◽  
Experimental Results ◽  
Loading Test ◽  
Composite Frame ◽  
Out Of Plane ◽  
Load Displacement

Abstract Experimental and numerical studies were conducted to investigate the in-plane behavior of the steel–concrete composite frame slab under cyclic loads. In the experimental study, an in-plane loading test of a typical composite frame slab was designed by constraining its out-of-plane deformations. The test observations, the load–displacement relationship, and the shear and flexural deformation components were discussed to investigate the in-plane load resistant behavior and the failure mechanism of the slab. The experimental results demonstrated an evident shear cracking concentration behavior and a pinching hysteretic curve associated with a typical shear-tension failure mode of the composite frame slab. In the numerical study, a high-efficiency modeling scheme based on the multiple vertical line element model (MVLEM) and the fiber beam–column element was developed for the test specimen. Comparisons with the experimental results showed that the developed model predicted the overall load–displacement relationship, the relationships associated with the shear and flexural deformation components, and the failure mode with a reasonable level of accuracy.

FEM Dynamic Analysis of Continuous Rolling Pass of Seamless Tubes

2011 ◽  
Vol 704-705 ◽  
pp. 1487-1491
Author(s):  
Zhi Long Feng ◽  
Xu Ma ◽  
Jing Yun Ma ◽  
Xiao Yu Zhou ◽  
Hui Qiang Liu ◽  
...  
Keyword(s):  
Cross Section ◽  
High Efficiency ◽  
Rolling Force ◽  
Low Cost ◽  
Deformation Characteristic ◽  
Element Model ◽  
Continuous Rolling ◽  
Pass Design ◽  
Rolling Pass ◽  
Result Show

The development of new products of seamless tubes require the development of corresponding grooves in order to manufacture tubes with high precision, high efficiency at low cost. In this work, a finite element model and dynamic simulation of continuous rolling pass for seamless tubes process has been implemented under the ANSYS/LS-DYNA environment to verify the validity of the pass design. The result show the deformation characteristic of cross-section, the variation regularity of rolling force, strain and stress conform to the reality. The work is effective for developing new grooves and products for seamless tube continuous rolling.

scholarly journals Effects of Thermal Undercooling and Thermal Cycles on the Grain and Microstructure Evolution of TC17 Titanium Alloy Repaired by Wire Arc Additive Manufacturing

2021 ◽  
Author(s):  
Yimin Zhuo ◽  
Chunli Yang ◽  
Chenglei Fan ◽  
Sanbao Lin
Keyword(s):  
Titanium Alloy ◽  
Additive Manufacturing ◽  
High Efficiency ◽  
Low Cost ◽  
Single Layer ◽  
Element Model ◽  
Maximum Effect ◽  
Thermal Cycles ◽  
Layer Deposition ◽  
Wire Arc Additive Manufacturing

Abstract Wire arc additive manufacturing (WAAM) can be used to repair blades or blisk made of titanium alloy with the advantage of high efficiency and low-cost. In this work, the finite element model of repairing the blade based on the arc heat source was established to investigate it. Results showed that the maximum effect of thermal undercooling appears when the peak current transforms to the base current (1Hz or 5Hz), which will promote the grains refinement with the combination of sufficient constitutional supercooling. Compared to the single-layer deposition, the microstructure in the near-heat affected zone (near-HAZ) of multi-layer deposition changes from the metastable β phases to the extremely fine α phases, which was caused by the repeated thermal cycles.

scholarly journals Tabu Genetic Cat Swarm Algorithm Analysis of Optimization Arrangement on Mistuned Blades Based on CUDA

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Yi Cai ◽  
Junjie Gu ◽  
Honggang Pan ◽  
Hongyuan Zhang ◽  
Tianyu Zhao
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Synthesis Method ◽  
Solution Space ◽  
Element Model ◽  
Lumped Parameter Model ◽  
Algorithm Analysis ◽  
Engineering Practice ◽  
Disk System ◽  
Bladed Disk

Tabu genetic cat swarm optimization algorithm is proposed for optimization arrangement on mistuned blades. Furthermore, it is improved to be an innovative parallel algorithm based on Compute Unified Device Architecture (CUDA), whose performance is analyzed both in continuous and discrete solution space. The lumped parameter model and finite element model of the bladed-disk system are established for dynamics analysis and optimization verification. The complete mistuned parameter identification method and the improved mixed-interface prestressed substructure modal synthesis method are two other highlights. The results indicate that the algorithm in this paper has the advantages of low cost and high efficiency. The vibration localization and amplitude of the mistuned bladed-disk system are both reduced significantly. The optimization analysis method is proved to be applicable to the mistuned bladed-disk system of the aeroengine in engineering practice.

scholarly journals Experimental Study of the Influence of Ink Properties and Process Parameters on Ejection Volume in Electrohydrodynamic Jet Printing

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 522 ◽  
Author(s):  
Lei Guo ◽  
Yongqing Duan ◽  
YongAn Huang ◽  
Zhouping Yin
Keyword(s):  
Electric Field ◽  
Process Parameters ◽  
Applied Voltage ◽  
Scaling Law ◽  
Third Order ◽  
Substrate Distance ◽  
Electrohydrodynamic Jet Printing ◽  
Average Electric Field ◽  
Jet Printing ◽  
The Right

Electrohydrodynamic jet (e-jet) printing has very promising applications due to its high printing resolution and material compatibility. It is necessary to know how to choose the printing parameters to get the right ejection volume. The previous scaling law of the ejection volume in e-jet printing borrows the scaling law of the ejection volume of an unstable isolated droplet charged to the Rayleigh limit. The influence of viscosity, applied voltage amplitude, and nozzle-to-substrate distance on the ejection volume in e-jet printing was not taken into account in the scaling law. This study investigated the influence of viscosity, conductivity, applied voltage, and nozzle-to-substrate distance on the ejection volume. The ejection volume increases with viscosity and decreases with applied voltage and nozzle-to-substrate distance. The average electric field was kept unchanged while changing the nozzle-to-substrate distance by changing the applied voltage according to the electric field model of a semi-infinite wire perpendicular to an infinite large planar counter electrode. The ejection volume decreases with conductivity as V ~ K − 0.6 , which is different from the previous scaling law, which concludes that V ~ K − 1 . Finally, a model about the relation between the ejection volume and four parameters was established by regression analysis using a third-order polynomial. Two more experiments were done, and the predicted results of the fitted model accorded well with the experiments. The model can be used to choose the ink properties and process parameters to get the right ejection volume.

Design and evaluation of a silicon based multi-nozzle for addressable jetting using a controlled flow rate in electrohydrodynamic jet printing

2008 ◽  
Vol 93 (24) ◽  
pp. 243114 ◽  
Author(s):  
Jun-Sung Lee ◽  
Sang-Yoon Kim ◽  
Young-Jae Kim ◽  
Jaehong Park ◽  
Yong Kim ◽  
...  
Keyword(s):  
Flow Rate ◽  
Electrohydrodynamic Jet Printing ◽  
Jet Printing ◽  
Controlled Flow ◽  
Silicon Based

FORMATION OF NANOLITER BUBBLES IN MICROFLUIDIC T-JUNCTIONS

NANO ◽  
2010 ◽  
Vol 05 (03) ◽  
pp. 175-184 ◽  
Author(s):  
JING FAN ◽  
YUXIANG ZHANG ◽  
LIQIU WANG
Keyword(s):  
Liquid Phase ◽  
Flow Rate ◽  
Formation Process ◽  
Relative Velocity ◽  
Gas Flow ◽  
Numerical Study ◽  
Bubble Formation ◽  
Pressure Variation ◽  
Width Ratio ◽  
Gas Flow Rate

A numerical study on nanoliter bubble formation process in microfluidic T-junctions is conducted. The simulated bubble sequence agrees well with experiments. The pressure and velocity distribution in liquid phase, and streamlines of relative velocity of liquid to bubbles are obtained. We also studied pressure variation at the junction and gas flow rate for the first several bubbles, and illustrated the special impact of channel width ratio on bubble formation process. Finally, we derived the critical nondimensional gas pressure above which bubbles can be generated.

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