scholarly journals Generation and Transport of Dielectric Droplets along Microchannels by Corona Discharge

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 181
Author(s):  
Qiang Tang ◽  
Shangru Zhou ◽  
Ruiheng Hu ◽  
Huai Zheng ◽  
Junheng Pan ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Simple Approach ◽  
Dielectric Liquid ◽  
Dielectric Fluid ◽  
Spreading Speeds

In this paper, a phenomenon of generation and transport of droplets is proposed, which is based on the dielectric liquid electroconvection induced by corona discharge. We placed the dielectric fluid on a conductive/nonconductive substrate, and then it broke apart to become many small droplets that move along the conductive microchannel. The behaviors of dielectric droplets were experimentally observed on different conductive microchannels in details. Spreading speeds and sizes of dielectric droplets were analyzed at different driving voltages and conductive microchannels. This work highlights a simple approach to produce and manipulate dielectric droplets along microchannels.

scholarly journals Tunable-Focus Liquid Lens through Charge Injection

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 109 ◽  
Author(s):  
Shizhi Qian ◽  
Wenxiang Shi ◽  
Huai Zheng ◽  
Zhaohui Liu
Keyword(s):  
Corona Discharge ◽  
Charge Injection ◽  
Dielectric Liquid ◽  
Liquid Lenses ◽  
Liquid Lens ◽  
3D Printed ◽  
Tube Structure

Liquid lenses are the simplest and cheapest optical lenses, and various studies have been conducted to develop tunable-focus liquid lenses. In this study, a simple and easily implemented method for achieving tunable-focus liquid lenses was proposed and experimentally validated. In this method, charges induced by a corona discharge in the air were injected into dielectric liquid, resulting in “electropressure” at the interface between the air and the liquid. Through a 3D-printed U-tube structure, a tunable-focus liquid lens was fabricated and tested. Depending on the voltage, the focus of the liquid lens can be adjusted in large ranges (−∞ to −9 mm and 13.11 mm to ∞). The results will inspire various new liquid-lens applications.

Chip-Ejection Mechanism and Experimental Study of Water Dispersant Dielectric Fluid on Small-Hole EDM

2010 ◽  
Vol 97-101 ◽  
pp. 4111-4115 ◽  
Author(s):  
Ming Rang Cao ◽  
Sheng Qiang Yang ◽  
Wen Hui Li ◽  
Shi Chun Yang
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Tap Water ◽  
Dielectric Liquid ◽  
Small Hole ◽  
Dielectric Fluid ◽  
Tool Electrode ◽  
Machining Quality ◽  
Hole Machining

The small hole EDM is one main method of micro holes machining and applied very widely. But it’s machining efficiency is low and machining stability is bad, which is more obvious because of chip-ejection difficulty when the ratio of length to diameter is rather large. Secondary discharge caused by chip-ejection difficulty not only makes the material removal rate reduce, but also causes geometric tolerance and affects product performance. Based on dispersion mechanism study of the water dispersant, the influence of the water dispersant is analyzed to chip-ejection, material removal rate and machining quality of the high-speed small-hole EDM. By contrasting the machining effect on using tap water with disperser dielectric liquid during electric spark small hole machining, adding the certain proportion disperser in water-based dielectric liquid may increase the material removal rate, decrease the tool wear rate, improve the effective impulse numbers, obviously reduce the second discharge number, and the taper of tool electrode and hole becomes small, so the hole machining quality enhances.

On the corona discharge spreading of dielectric liquid films

2013 ◽  
Vol 71 (3) ◽  
pp. 496-498 ◽  
Author(s):  
S.R. Mahmoudi ◽  
K. Adamiak ◽  
G.S.P. Castle
Keyword(s):  
Corona Discharge ◽  
Liquid Films ◽  
Dielectric Liquid

Cooling of a lithium ion battery using phase change material with air/dielectric fluid media: A numerical study

2019 ◽  
Vol 234 (5) ◽  
pp. 722-738 ◽  
Author(s):  
T Amalesh ◽  
N Lakshmi Narasimhan
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Generation ◽  
Lithium Ion ◽  
Dielectric Liquid ◽  
Dielectric Fluid ◽  
Li Ion Batteries ◽  
Fluid Media ◽  
Li Ion ◽  
Change Material

This paper proposes a method of cooling lithium ion (Li-ion) batteries using a phase change material RT35 in combination with air or a dielectric fluid media (STO 50). Three-dimensional numerical investigations have been carried out using Ansys Fluent to assess the cooling performance under different rates of discharging (1C, 2C, and 3C) of a 38120P Li-ion battery. Five different cases have been investigated and the relative benefits of the combined phase change material–air/dielectric liquid cooling compared over an air or dielectric cooling alone for the battery. Actual heat generation data available for the battery was made use of and supplied to the source term of the energy equation in the solver. A separate user-defined macro on the heat generation of the battery was developed by the authors for the purpose. The numerical simulation was validated comparing the present results with published experimental data for a bare adiabatic 38120P Li-ion cell. The results showed that the cooling was better with phase change material–air or phase change material–dielectric liquid combination compared to air or dielectric fluid alone, capable of reducing the cell temperature further by 6 ℃. From the study, employing phase change material in combination with a dielectric liquid has been suggested as a promising option for thermal management of Li-ion batteries at higher discharging rates to maintain the cell temperatures below 37 ℃.

Experimental Analysis of Canola Oil as Dielectric Fluid in Electric Discharge Machining of AISI D2 Steel

2020 ◽  
Vol 978 ◽  
pp. 49-54
Author(s):  
Kusumba Mangapathi Rao ◽  
D. Vinay Kumar ◽  
K.Chandra Shekar ◽  
Balasubramaniyan Singaravel
Keyword(s):  
Electric Discharge ◽  
Canola Oil ◽  
Removal Rate ◽  
Dielectric Liquid ◽  
Dielectric Fluid ◽  
Work Piece ◽  
Electrode Wear ◽  
Electric Discharge Machining ◽  
Plasma Generation ◽  
Aisi D2

Electric Discharge Machining (EDM) is a thermo-electrical disintegration process, utilized to cut hard materials into complex shapes. In EDM, the three vital components are work-piece material, electrode material and dielectric liquid. The significant function of the dielectric fluid is to produce a breakdown voltage for creating a spark between work-piece and electrode. This spark creates ionization by plasma generation and it expels the material from work-piece. In most cases, hydrocarbon-based dielectric liquid is preferred in the EDM process. This kind of dielectric liquid generates hazardous gases which are harmful to people, environment and ecological balances. In this experiment, Canola oil is utilized and the outcomes are compared. The input parameters are Pulse on/off time, current and gap voltage. Copper, Brass and Tungsten-Copper (Alloy) are used as electrodes. The output values from the experiments are Surface Roughness (SR), Electrode Wear Rate (EWR) and Material Removal Rate (MRR). The outcomes demonstrated that Canola oil-based dielectric fluid has comparable properties of conventional based dielectric fluid. This Canola based dielectric gives more prominent MRR value than EDM oil-based dielectric liquid and furthermore higher EWR and SR values are recorded. The proposed Canola oil-based dielectric fluid is biodegradable and has improved suitability in machining.

Controllable Flowing of a Dielectric Fluid Droplet under the Action of Corona Discharge

Langmuir ◽  
2021 ◽  
Author(s):  
Shangru Zhou ◽  
Junheng Pan ◽  
Zhiming Guo ◽  
Yanghui Xiang ◽  
Huai Zheng ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Dielectric Fluid

scholarly journals Thermal Oxidating Stabilization and Cleaning from Conductive Impurities of Dielectric Liquid - Esters

2020 ◽  
Vol 6 (9) ◽  
pp. 204-210
Author(s):  
M. Abdullayeva
Keyword(s):  
Dielectric Liquid ◽  
Dielectric Fluid ◽  
Electrophysical Properties ◽  
Adsorption Method ◽  
Oxidative Stabilization ◽  
Electrophysical Parameters

In this work are developed the basic electrophysical properties of the ester- acetoxymethyl-sec.hexyl-o-xylene; methods for its purification and stabilization. There were chosen the adsorption method of thermo-oxidative stabilization to clean dielectric fluid from conductive impurities. As a result of The electrophysical characteristics of the acetoxymethyl-sec.hexyl-o-xylene ester, as well as the method of its purification using alumina, and hydrogenation on a catalyst representing 0.2% palladium on alumina and stabilization using additives NG-2246. As a result of the research, it was possible to obtain an ester with improved electrophysical parameters.

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