scholarly journals Interfacial performance and impact resistance of argon plasma treated UHMWPE/STF inter-ply hybrid composites

2021 ◽  
Vol 16 ◽  
pp. 155892502110438
Author(s):  
Zixuan Liu ◽  
Keyi Wang ◽  
Huchen Wang ◽  
Letian Li ◽  
Huan Chen ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Flow Rate ◽  
Gas Flow ◽  
Treatment Time ◽  
Hybrid Composites ◽  
Impact Resistance ◽  
Gas Flow Rate ◽  
Water Contact ◽  
Ar Plasma ◽  
The Impact

This study explored the influence of low temperature glow discharged argon (Ar) plasma on interfacial performance and impact resistance of ultra-high molecular weight polyethylene (UHMWPE) inter-ply hybrid composites. The composites were composed of UHMWPE and meta-aramid plain woven laminates with shear thickening fluid (STF). Water contact angle and drop-weight resistance of the composites with various Ar plasma treatment parameters were tested to investigate the interfacial performance and impact properties of the composites. The tested treatment parameters of this study included treating time, treating power, and gas flow rate. It was found that the best interfacial adhesion of UHMWPE and the impact resistance of the composites was realized at the plasma treatment power of 100 W, treatment time of 150 s, and gas flow rate of 4 sccm. In the follow-up research, this study conducted ballistic test to further explore the bulletproof effect and application prospect of this material.

scholarly journals Heterogeneous Bonding of PMMA and Double-Sided Polished Silicon Wafers through H2O Plasma Treatment for Microfluidic Devices

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 580
Author(s):  
Chao-Ching Chiang ◽  
Philip Nathaniel Immanuel ◽  
Yi-Hsiung Chiu ◽  
Song-Jeng Huang
Keyword(s):  
Plasma Treatment ◽  
Flow Rate ◽  
Gas Flow ◽  
Treatment Time ◽  
Optical Emission ◽  
Microfluidic Devices ◽  
Oh Radicals ◽  
Gas Flow Rate ◽  
Oh Groups ◽  
Plasma Treatment Time

In this work we report on a rapid, easy-to-operate, lossless, room temperature heterogeneous H2O plasma treatment process for the bonding of poly(methyl methacrylate) (PMMA) and double-sided polished (DSP) silicon substrates by for utilization in sandwich structured microfluidic devices. The heterogeneous bonding of the sandwich structure produced by the H2O plasma is analyzed, and the effect of heterogeneous bonding of free radicals and high charge electrons (e−) in the formed plasma which causes a passivation phenomenon during the bonding process investigated. The PMMA and silicon surface treatments were performed at a constant radio frequency (RF) power and H2O flow rate. Changing plasma treatment time and powers for both processes were investigated during the experiments. The gas flow rate was controlled to cause ionization of plasma and the dissociation of water vapor from hydrogen (H) atoms and hydroxyl (OH) bonds, as confirmed by optical emission spectroscopy (OES). The OES results show the relative intensity peaks emitted by the OH radicals, H and oxygen (O). The free energy is proportional to the plasma treatment power and gas flow rate with H bonds forming between the adsorbed H2O and OH groups. The gas density generated saturated bonds at the interface, and the discharge energy that strengthened the OH-e− bonds. This method provides an ideal heterogeneous bonding technique which can be used to manufacture new types of microfluidic devices.

Water Modeling Study on Removal of Inclusions in RH Degasser

2013 ◽  
Vol 423-426 ◽  
pp. 225-229
Author(s):  
Chun Jie Yang ◽  
Fu Ping Tang ◽  
Tao He
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Influence Factor ◽  
Treatment Time ◽  
Similarity Theory ◽  
Removal Rate ◽  
Nacl Solution ◽  
Gas Flow Rate ◽  
Vacuum Refining ◽  
Optimal Values

A physical model was established according to the similarity theory to simulate the real 175t RH-TB vacuum refining device. Liquid steel is simulated by Nacl solution, the air is approximate argon and polypropylene simulate inclusions. The influence regularity of treatment time ,lift gas flow rate and submersion depth of snorkels on the inclusions removal rate have been discussed, the optimal values for each influence factor have been found and can be used in optimizing the refining technology.

scholarly journals Gas-dynamic aspects of new metal-cutting plasmatron design

2021 ◽  
Vol 2021 (5) ◽  
pp. 7-13
Author(s):  
Sergey Anakhov ◽  
Anatoliy Matushkin ◽  
Yuriy Pykin
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Metal Cutting ◽  
Dynamic Stabilization ◽  
Plasma Cutting ◽  
Gas Flow Rate ◽  
Gas Dynamic ◽  
Design Solutions ◽  
The Impact

The analysis of the impact of different design solutions for the system of plasmatron gas-dynamic stabilization for metal-cutting upon effectiveness of gas flow rate balance according to the section of a gas path is carried out. A system of turbulent stabilization, using two swirlers is offered. The effect of plasma cutting reliability and quality is shown.

scholarly journals ANN prediction of the decolourisation efficiency of the organic dyes in wastewater by plasma needle

2020 ◽  
Vol 85 (6) ◽  
pp. 831-844
Author(s):  
Tatjana Mitrovic ◽  
Mirjana Ristic ◽  
Aleksandra Peric-Grujic ◽  
Sasa Lazovic
Keyword(s):  
Plasma Treatment ◽  
Flow Rate ◽  
Gas Flow ◽  
Treatment Time ◽  
Organic Dyes ◽  
Reactive Orange 16 ◽  
Promising Tool ◽  
Plasma Needle ◽  
Artificial Neural Network Ann ◽  
Reactive Orange

In this paper, the results of decolourisation of Reactive Orange 16 (RO 16), Reactive Blue 19 (RB 19) and Direct Red 28 (DR 28) textile dyes in aqueous solution by plasma needle are presented. Treatment time, feed gas flow rate (1, 4 and 8 dm3 min-1) and gas composition (Ar, Ar/O2) were optimized to achieve the best performance of the plasma treatment. An artificial neural network (ANN) was used for the prediction of parameters relevant for the decolourisation outcome. It was found that more than 95 % decolourisation could be achieved for all three dyes after plasma treatment, although the decolourisation of DR 28 was much slower than those of the other two dyes, which could be explained by the complexity of its molecular structure. It was concluded that the oxidation was very dependent on all three mentioned parameters. The ANN predicted the treatment time as the crucial factor for decolourisation performance of RO 16 and DR 28, while the Ar flow rate was the most relevant for RB 19 decolourisation. The obtained results suggest that the plasma needle is a promising tool for the oxidation of organic pollutants and that an ANN could be used for optimization of the treatment parameters to achieve high removal rates.

scholarly journals Developing Super-Hydrophobic and Abrasion-Resistant Wool Fabrics Using Low-Pressure Hexafluoroethane Plasma Treatment

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3228
Author(s):  
Shama Parveen ◽  
Sohel Rana ◽  
Parikshit Goswami
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Abrasion Resistance ◽  
Gas Flow ◽  
Treatment Time ◽  
Low Pressure ◽  
Industrial Applications ◽  
Plasma Parameters ◽  
Water Contact ◽  
Wool Fabrics

The growing interest in wool fibres as an eco-friendly and sustainable material for diverse industrial applications requires an enhancement of their functional performance. To address this, wool fabrics were treated in the present research with low-pressure hexafluoroethane (C2F6) plasma to impart superhydrophobicity and improve their abrasion resistance. Unscoured and scoured wool fabrics were treated with C2F6 while varying plasma power (80 W and 150 W), gas flow rate (12 sccm and 50 sccm) and treatment time (6 min and 20 min), and the effect of plasma parameters on the abrasion resistance, water contact angle and dyeing behaviour of the wool fabrics was studied. Martindale abrasion testing showed that the surface abrasion of the wool fabrics increased with the number of abrasion cycles, and the samples treated with 150 W, 20 min, 12 sccm showed superior abrasion resistance. The scoured wool fabrics showed a contact angle of ~124°, which was stable for only 4 min 40 s, whereas the plasma-treated samples showed a stable contact angle of over 150°, exhibiting a stable superhydrophobic behaviour. The C2F6 plasma treatment also significantly reduced the exhaustion of an acid dye by wool fabrics. The EDX study confirmed the deposition of fluorine-containing elements on the wool fabrics significantly altering their properties.

The Efficiency Calculation and Structural Optimization of Eddy Composite Drainage and Gas Recovery

2013 ◽  
Vol 838-841 ◽  
pp. 1909-1912
Author(s):  
Chun Bao Ma
Keyword(s):  
Moisture Content ◽  
Flow Rate ◽  
Eddy Current ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Two Phase ◽  
Normal Section ◽  
Gas Recovery ◽  
Section Shape ◽  
The Impact

Part of the gas fields utilize eddy current instruments to drainage and gas recovery currently, while the mechanism of drainage and gas recovery is not clear. This article conducts drainage and gas recovery simulating caculation, analyses the impact of gas flow rate, the moisture content of bottomhole and eddy current tool structure of its drainage effect, basing on the theory of gas-liquid two-phase flow. The results show that: the gas flow rate, moisture content and the normal section shape of eddy current tool spiral piece are the main factors that affect the eddy current tools draining. As follows: the larger the gas flowing rate, the better the tool draining effect; when the bottomhole moisture content is less than 10%, the draining effect is not obvious; but when the bottomhole moisture content is greater than 10%, with higher the moisture content, the draining effect is more obvious; the normal section shape of spiral piece is better to be rectangular rather than trapezoidal; the direction of rotation of the spiral piece (left and right hand) has little effect on draining.

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

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