scholarly journals A Liquid-Metal-Based Dielectrophoretic Microdroplet Generator

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 769 ◽  
Author(s):  
Wang ◽  
Zhang ◽  
Gao ◽  
Wang ◽  
Deng ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Numerical Simulations ◽  
Parametric Study ◽  
Microfluidic Channel ◽  
Droplet Generator ◽  
Metal Electrodes ◽  
Droplet Generators

This paper proposes a novel microdroplet generator based on the dielectrophoretic (DEP) force. Unlike the conventional continuous microfluidic droplet generator, this droplet generator is more like “invisible electric scissors”. It can cut the droplet off from the fluid matrix and modify droplets’ length precisely by controlling the electrodes’ length and position. These electrodes are made of liquid metal by injection. By applying a certain voltage on the liquid-metal electrodes, the electrodes generate an uneven electric field inside the main microfluidic channel. Then, the uneven electric field generates DEP force inside the fluid. The DEP force shears off part from the main matrix, in order to generate droplets. To reveal the mechanism, numerical simulations were performed to analyze the DEP force. A detailed experimental parametric study was also performed. Unlike the traditional droplet generators, the main separating force of this work is DEP force only, which can produce one droplet at a time in a more precise way.

Linear growth of instabilities on a liquid metal under normal electric field

1993 ◽  
Vol 3 (8) ◽  
pp. 1201-1225 ◽  
Author(s):  
G. N�ron de Surgy ◽  
J.-P. Chabrerie ◽  
O. Denoux ◽  
J.-E. Wesfreid
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Linear Growth ◽  
Normal Electric Field

Effect of Electric Field on the Lubricating Performance of Ga‐Based Liquid Metal

2019 ◽  
Vol 6 (10) ◽  
pp. 1900028 ◽  
Author(s):  
Jie Guo ◽  
Jun Cheng ◽  
Hui Tan ◽  
Shengyu Zhu ◽  
Zhuhui Qiao ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Electric Field

Mechanism of Cell Lysis in Microfluidic Channel With Integrated Nanocomposite Electrodes

2013 ◽  
Author(s):  
Madhusmita Mishra ◽  
Anil Krishna Koduri ◽  
Aman Chandra ◽  
D. Roy Mahapatra ◽  
G. M. Hegde
Keyword(s):  
Electric Field ◽  
Microfluidic Channel ◽  
Cell Lysis ◽  
Bacterial Cells ◽  
Nano Composite ◽  
Time Resolved ◽  
Ac Electric Field ◽  
Cell Dispersion ◽  
Electrical Lysis ◽  
Nanocomposite Electrodes

This paper reports on the characterization of an integrated micro-fluidic platform for controlled electrical lysis of biological cells and subsequent extraction of intracellular biomolecules. The proposed methodology is capable of high throughput electrical cell lysis facilitated by nano-composite coated electrodes. The nano-composites are synthesized using Carbon Nanotube and ZnO nanorod dispersion in polymer. Bacterial cells are used to demonstrate the lysis performance of these nanocomposite electrodes. Investigation of electrical lysis in the microchannel is carried out under different parameters, one with continuous DC application and the other under DC biased AC electric field. Lysis in DC field is dependent on optimal field strength and governed by the cell type. By introducing the AC electrical field, the electrokinetics is controlled to prevent cell clogging in the micro-channel and ensure uniform cell dispersion and lysis. Lysis mechanism is analyzed with time-resolved fluorescence imaging which reveal the time scale of electrical lysis and explain the dynamic behavior of GFP-expressing E. coli cells under the electric field induced by nanocomposite electrodes. The DNA and protein samples extracted after lysis are compared with those obtained from a conventional chemical lysis method by using a UV–Visible spectroscopy and fluorimetry. The paper also focuses on the mechanistic understanding of the nano-composite coating material and the film thickness on the leakage charge densities which lead to differential lysis efficiency.

Numerical Simulations of Electric Field Driven Self-Assembly of Monolayers of Mixtures of Nanoparticles

2017 ◽  
Author(s):  
E. Amah ◽  
N. Musunuri ◽  
Ian S. Fischer ◽  
Pushpendra Singh
Keyword(s):  
Electric Field ◽  
Physical Properties ◽  
Numerical Simulations ◽  
Self Assembly ◽  
Composite Particle ◽  
Critical Value ◽  
Direct Numerical Simulations ◽  
Composite Particles ◽  
Liquid Interfaces ◽  
Induced Dipole

We numerically study the process of self-assembly of particle mixtures on fluid-liquid interfaces when an electric field is applied in the direction normal to the interface. The force law for the dependence of the electric field induced dipole-dipole and capillary forces on the distance between the particles and their physical properties obtained in an earlier study by performing direct numerical simulations is used for conducting simulations. The inter-particle forces cause mixtures of nanoparticles to self-assemble into molecular-like hierarchical arrangements consisting of composite particles which are organized in a pattern. However, there is a critical electric intensity value below which particles move under the influence of Brownian forces and do not self-assemble. Above the critical value, when the particles sizes differed by a factor of two or more, the composite particle has a larger particle at its core and several smaller particles forming a ring around it. Approximately same sized particles, when their concentrations are approximately equal, form binary particles or chains (analogous to polymeric molecules) in which positively and negatively polarized particles alternate, but when their concentrations differ the particles whose concentration is larger form rings around the particles with smaller concentration.

Liquid Metal Electrodes for Energy Storage Batteries

2016 ◽  
Vol 6 (14) ◽  
pp. 1600483 ◽  
Author(s):  
Haomiao Li ◽  
Huayi Yin ◽  
Kangli Wang ◽  
Shijie Cheng ◽  
Kai Jiang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Liquid Metal ◽  
Metal Electrodes ◽  
Storage Batteries

Electrokinetic instability due to streamwise conductivity gradients in microchip electrophoresis

2021 ◽  
Vol 925 ◽  
Author(s):  
Kaushlendra Dubey ◽  
Sanjeev Sanghi ◽  
Amit Gupta ◽  
Supreet Singh Bahga
Keyword(s):  
Electric Field ◽  
Numerical Simulations ◽  
Electric Fields ◽  
Quantitative Measure ◽  
Underlying Mechanism ◽  
Scaling Analysis ◽  
Recirculating Flow ◽  
Electrokinetic Instability ◽  
Spatial Features ◽  
Proper Orthogonal Decomposition Technique

We present an experimental and numerical investigation of electrokinetic instability (EKI) in microchannel flow with streamwise conductivity gradients, such as those observed during sample stacking in capillary electrophoresis. A plug of a low-conductivity electrolyte solution is initially sandwiched between two high-conductivity zones in a microchannel. This spatial conductivity gradient is subjected to an external electric field applied along the microchannel axis, and for sufficiently strong electric fields an instability sets in. We have explored the physics of this EKI through experiments and numerical simulations, and supplemented the results using scaling analysis. We performed EKI experiments at different electric field values and visualised the flow using a passive fluorescent tracer. The experimental data were analysed using the proper orthogonal decomposition technique to obtain a quantitative measure of the threshold electric field for the onset of instability, along with the corresponding coherent structures. To elucidate the physical mechanism underlying the instability, we performed high-resolution numerical simulations of ion transport coupled with fluid flow driven by the electric body force. Simulations reveal that the non-uniform electroosmotic flow due to axially varying conductivity field causes a recirculating flow within the low-conductivity region, and creates a new configuration wherein the local conductivity gradients are orthogonal to the applied electric field. This configuration leads to EKI above a threshold electric field. The spatial features of the instability predicted by the simulations and the threshold electric field are in good agreement with the experimental observations and provide useful insight into the underlying mechanism of instability.

scholarly journals Experimental and Parametric Study of Extended Fins In The Optimization of Internal Combustion Engine Cooling Using CFD

2012 ◽  
pp. 81-90
Author(s):  
J.Ajay Paul ◽  
Sagar Chavan Vijay ◽  
U. Magarajan ◽  
R.Thundil Karuppa Raj
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Internal Combustion Engine ◽  
Numerical Simulations ◽  
Parametric Study ◽  
Combustion Engine ◽  
Heat Transfer Characteristics ◽  
Engine Cooling ◽  
Fin Thickness ◽  
Annular Fins

In this experiment the single cylinder air cooled engines was assumed to be a set of annular fins mounted on a cylinder. Numerical simulations were carried out to determine the heat transfer characteristics of different fin parameters namely, number of fins, fin thickness at varying air velocities. A cylinder with a single fin mounted on it was tested experimentally. The numerical simulation of the same setup was done using CFD. The results validated with close accuracy with the experimental results. Cylinders with fins of 4 mm and 6 mm thickness were simulated for 1, 3, 4 &6 fin configurations.

FABRICATION OF DISPERSED ALIGNED CARBON NANOTUBE ARRAY BETWEEN METAL ELECTRODES

2006 ◽  
Vol 05 (04n05) ◽  
pp. 389-394
Author(s):  
CHANGXIN CHEN ◽  
YAFEI ZHANG
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
High Frequency ◽  
Metal Electrodes ◽  
Nanotube Array ◽  
Carbon Nanotube Array ◽  
Ac Electric Field ◽  
High Volatility ◽  
Surface Decoration ◽  
High Frequency Ac

Dispersed aligned single-wall carbon nanotube (SWCNT) array has been formed between electrodes by electric field assisted alignment of surface decorated SWCNTs. The surface decoration of SWCNTs with functional molecules allows them to dispersedly bridge metal electrodes and effectively obviates the entanglement between SWCNTs. The influences of solution volatility and electric-field type on the alignment are investigated. It is indicated that the well-oriented SWCNT array can be achieved by using the high-volatility solvent and the high-frequency AC electric field to align SWCNTs.

Sign in / Sign up

Export Citation Format

Share Document