Electrowetting on Dielectric (EWOD) Assisted Droplet Desiccation

2015 ◽  
Author(s):  
Collin T. Burkhart ◽  
Peter D. Dunning ◽  
Michael J. Schertzer
Keyword(s):  
Pathogen Detection ◽  
Test Results ◽  
Electrowetting On Dielectric ◽  
Intensity Measurements ◽  
Three Phase ◽  
Microscopy Analysis ◽  
Microfabrication Technique ◽  
Electrokinetic Force ◽  
Uniform Droplet ◽  
Promising Type

Lab-on-a-chip (LOAC) devices are emerging technologies that aim to perform all of the laboratory functions of traditional diagnostic tests on single microchips. Microarrays are one promising type of LOAC device that consist of an array of droplets for testing tens to thousands of samples simultaneously. Microarrays are commonly used in gene sequencing, pathogen detection, determining microbial resistances, and conducting enzyme-linked immunosorbent assays (ELISAs). As droplets in these arrays dry, the majority of material within the droplet is deposited around the periphery. This phenomenon is referred to as the coffee stain effect. The non-uniform depositions left by this effect can result in variation of fluorescence intensity measurements in automated vision systems. A means of producing more uniform particle depositions for the microscopy analysis would allow for more accurate test results. One promising method for suppression of the coffee stain effect involves the use of electrowetting on dielectric (EWOD). EWOD devices apply an electrokinetic force at the three-phase contact line to manipulate the shape of a droplet interface. The Mugele group has already begun investigating EWOD’s effects on the coffee stain effect and found that an AC voltage applied to droplets on EWOD devices can suppress the coffee stain effect and produce smaller, more uniform droplet deposition patterns. This work presents (i) a method to characterize the deposition pattern left by a desiccated droplet as a function of radial position and (ii) a discussion of the microfabrication technique used to create devices to perform EWOD assisted desiccation for both AC and DC voltages.

Numerical Simulation of Digital Microfluidics Based on Electro-Dynamic Model

2012 ◽  
Vol 2 (3) ◽  
pp. 14-23
Author(s):  
Liguo Chen ◽  
Mingxiang Ling ◽  
Deli Liu
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Contact Line ◽  
Contact Area ◽  
Digital Microfluidics ◽  
Phase Contact ◽  
Electrowetting On Dielectric ◽  
Three Phase ◽  
Internal Mechanism ◽  
Contact Domain

Aiming at the doubt and divarication about the internal mechanism of electrowetting on dielectric (EWOD) in digital microfluidics, the authors attempted to explain the internal mechanism of EWOD through electro-dynamic-based numerical simulation model. First, the boundary conditions for the governing equation were found. Then the influence of mesh number on simulation results was analyzed and feasibility of the simulation model was verified by comparing numerical results with theoretical ratiocination. Finally, they compared the electro-dynamic actuation force acting on the surface of droplet on three digital microfluidic structures, which have the same three-phase contact line but different area of contact domain. Analytical results showed that electro-dynamic force generated solely by the accumulation of induced charges in contact domain was three times larger than that generated by three-phase contact line. Induced charges accumulated on both three-phase contact line and contact area of droplet gave the contribution to EWOD, but contact area played a major role in the change of contact angle of droplet.

scholarly journals Evaluation of Frother Types for Improved Flotation Recovery and Selectivity

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 590 ◽  
Author(s):  
Qingqing Huang ◽  
Xinbo Yang ◽  
Rick Q. Honaker
Keyword(s):  
Froth Flotation ◽  
Plug Flow ◽  
Test Results ◽  
Combustible Material ◽  
Mixing Conditions ◽  
Flotation Column ◽  
Fundamental Properties ◽  
Flow Mixing ◽  
Three Phase ◽  
Ultrafine Coal

A laboratory study was conducted to evaluate and compare the effectiveness of nine different frother types when used in a three-phase, continuously operating froth flotation system. The frothers included several that are commonly used in the industry (e.g., MIBC, 2EH, and F-1) as well as unique frother types (e.g., F-3). The tests were conducted in a 5-cm diameter laboratory flotation column that provided near plug-flow mixing conditions due to a length-to-diameter ratio of around 50:1. Test results indicate that F-1, MIBC, and MPC (in order of decreasing effectiveness) provided the weakest performance in terms of combustible recovery while F-2, MAC, and 2EH were the top three generating the highest separation efficiencies. When processing ultrafine coal, the ash content of the flotation concentrate ranged from 10% to 15% while recovering over 80% of the combustible material. F-3, F-4, and DIBC provided over 80% recovery of combustibles at the expense in the amount of hydraulic entrainment. The flotation performances were also closely examined in accordance with the fundamental properties of the nine tested frothers, and their correlations were addressed in detail.

Wind-Driven SEIGs for Supplying Isolated Loads Employing DSP Based Power Electronic Controllers

2012 ◽  
Vol 36 (6) ◽  
pp. 739-757 ◽  
Author(s):  
S. Senthilkumar ◽  
N. Kumaresan ◽  
N. Rakesh ◽  
K. Vijayakumar ◽  
M. Subbiah
Keyword(s):  
Wind Speed ◽  
Test Results ◽  
Power Requirement ◽  
Induction Generators ◽  
Detailed Method ◽  
Three Phase ◽  
Control Scheme ◽  
Bridge Rectifier ◽  
Constant Magnitude ◽  
Set Up

A DSP based closed-loop system has been developed for wind-driven three-phase Self-Excited Induction Generators (SEIGs) using a diode bridge rectifier (DBR) followed by an IGBT inverter. This system is meant for supplying isolated ac loads with a voltage of constant magnitude and frequency, for any operating condition of varying nature of wind speed and consumer load. The configuration and implementation of this proposed system have been fully described. The detailed method of analysing and predetermining the performance characteristics of such stand-alone systems has also been explained. Test results obtained on an SEIG operated with the controller built in the laboratory, demonstrate the successful working of both the hardware and software of the control scheme and the usefulness of the set-up as a whole for supplying isolated ac loads. With the varying nature of wind speed, a method of meeting the power balance between the wind power available and the load power requirement has also been explained with extensive Simulation studies.

Method of Judging the Energy Measurement Device Error Wiring Based on Checking Tables

2010 ◽  
Vol 139-141 ◽  
pp. 2247-2251
Author(s):  
Xing Zhong Zhang
Keyword(s):  
Phase Angle ◽  
Energy Measurement ◽  
Test Results ◽  
Measurement Device ◽  
Electric Parameter ◽  
Simple Method ◽  
Line Voltage ◽  
Three Phase ◽  
Working Efficiency

Focused on the complexity and Time-consuming of judging the error wiring of the energy measurement device, It extracts a series of electric parameter tables including phase angle table, such as the voltage sequence table, the line voltage location table, phase angle transform table, and phase angle table. And proposes a simple method of judging the error wiring of Three-phase three-wire error wiring of two components energy measurement device. The method based only on the four tables, inspectors only need to look-up the tables in accordance with the measured dates and get the error wiring instead of drawing vector plots. Because these tables root from vector plots. It greatly simplifies inspectors to judge wiring mistake, improves the working efficiency and makes the test results more accurate.

Current-Fed Flyback Push-Pull DC-DC Converter Based on Three-Phase Transformer

2014 ◽  
Vol 614 ◽  
pp. 164-167
Author(s):  
You Chen Yuan ◽  
Yang Zhang ◽  
Yu Wei Chen
Keyword(s):  
Magnetic Flux ◽  
High Frequency ◽  
Magnetic Circuit ◽  
Magnetic Loop ◽  
Test Results ◽  
Static And Dynamic Characteristics ◽  
Three Phase ◽  
Independent Functions ◽  
Flow Through ◽  
Efficiency And Reliability

Three-phase current-fed flyback push-pull dc-dc converter is proposed in this paper, which is a new circuit topology putting into practice based on current-fed flyback push-pull dc-dc converter. Structure is simplified; cost is cut down; efficiency and reliability are improved all by the high frequency three-phase transformer technique that carries out functions of flyback transformer as well as push-pull transformer at the same time. Three-phase transformer can be separated into relatively independent functions of flyback transformer and push-pull transformer with the reluctance produced by the magnetic gap in the central phase; the flyback transformer produces only common-mode flux in the magnetic circuit of push-pull transformer and does not influence its output signal; the magnetic flux in push-pull transformer is blocked by the magnetic gap and can only flow through the outer magnetic loop. Investigational device is designed; static and dynamic characteristics are observed and test results are verified by the experimentation.

An Electronic Three Phase Turbo-Generator Model Suitable for Use in a Hybrid Configuration with a Minicomputer

1975 ◽  
Vol 12 (4) ◽  
pp. 338-356 ◽  
Author(s):  
S. E. Blanch ◽  
K. Morsztyn ◽  
T. Dillon
Keyword(s):  
Power System ◽  
Test Results ◽  
Variable Parameters ◽  
Generator Model ◽  
Turbo Generator ◽  
Electronic Model ◽  
Three Phase ◽  
Hybrid Configuration

This paper describes an electronic model of a three-phase turbogenerator with widely variable parameters. The model is interphased into the Monash TNA to provide a Power System Simulator suitable for statistical investigations of Power System problems. Test results obtained on the model for the ‘Northfleet System’ are also given.

Green Design and Manufacturing of Premium Efficiency Motor

2013 ◽  
Vol 456 ◽  
pp. 268-273
Author(s):  
Lie Zhun Wang ◽  
Zi Qing Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structure Design ◽  
Integrated System ◽  
Heat Radiation ◽  
Test Results ◽  
Electromagnetic Environment ◽  
Asynchronous Motors ◽  
Three Phase ◽  
Element Method

YE3 series of premium efficiency three-phase asynchronous motors adopt computer integrated system and anticipate the best optimized electrical design. In the structure design, airflow validity is analyzed by finite-element method (FEM) and the motors fan is designed optimally through experimental results; on the fan housing, the Ansoft finite-element method is used in analyzing the electromagnetic field , and designing optimally electromagnetic environment with the test results; the finite-element method is also used in analyzing the temperature field, connecting with the test results to optimize the ventilation structure. The radiating rib is metrical distribution and arrangement along the diameter of axle direction on the motor housing, following the principle of heat radiation and the principle of fluid mechanics, which can improve the ventilation and cooling effect. The design of the motor has reached the international advanced level.

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