Investigation of a Plasma Jet Generated by High Voltage Discharge at Atmospheric Pressure

2011 ◽  
Vol 383-390 ◽  
pp. 5907-5911 ◽  
Author(s):  
Xue Chen Li ◽  
Ning Yuan ◽  
Peng Ying Jia
Keyword(s):  
Flow Rate ◽  
High Voltage ◽  
Discharge Current ◽  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Plasma Plume ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Uniform Plasma

Appling a high voltage to the dielectric barrier discharge device in a coaxial geometry in flowing argon, a uniform plasma plume is generated at one atmospheric pressure. The waveforms of discharge current and the applied voltage are investigated and results indicate that both the intensity and duration width of the discharge current pulse increase with increasing the applied voltage. The gas temperature of the plasma plume is investigated by using an infrared thermometer. The gas temperature of the plasma plume are functions of gas flow rate, peak value and the frequency of the applied voltage. Results show that the gas temperature increases with increasing the applied voltage or its frequency, while it decreases with increasing the gas flow rate. A qualitative explanation is given for the variance of gas temperature as functions of the experimental parameters by analyzing the waveforms of the discharge current and the applied voltage.

scholarly journals Electrical and Spectroscopic Diagnostics of Atmospheric Pressure DBD Plasma Jet

2016 ◽  
Vol 40 (1) ◽  
pp. 23-36
Author(s):  
NC Roy ◽  
MR Talukder
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Optical Emission ◽  
Plasma Jet ◽  
Diagnostic Techniques ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Dbd Plasma

Atmospheric pressure capillary dielectric barrier oxygen discharge plasma jet is developed to generate nonthermal plasma using unipolar positive pulse power supply. Both electrical and optical diagnostic techniques were used to characterize the produced plasma as functions of applied voltage and gas flow rate. Electrical diagnostics indicated that the discharge frequency decreased with gas flow rate but increased with the applied voltage. Analytical results obtained from the optical emission spectroscopic data revealed the gas temperature, excitation temperature and electron density. Gas temperature was found to decrease with increasing oxygen flow rate but increase linearly with applied voltage. The produced plasma was applied preliminarily to study the inactivation yield of Fusarium oxysporum fungus infected potato samples.Journal of Bangladesh Academy of Sciences, Vol. 40, No. 1, 23-36, 2016

scholarly journals Effects of Gas Flow on Spectral Properties of Plasma Jet Induced by Microwave

2018 ◽  
Vol 15 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Gas Flow ◽  
Microwave Plasma ◽  
Plasma Jet ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Argon Gas ◽  
Jet Length ◽  
Maximum Value

In this paper, a construction microwave induced plasma jet(MIPJ) system was used to produce a non-thermal plasma jet at atmospheric pressure, at standard frequency of 2.45 GHz and microwave power of 800 W. The working gas Argon (Ar) was supplied to flow through the torch with adjustable flow rate using flow meter regulator. The influence of the MIPJ parameters such as applied voltage and argon gas flow rate on macroscopic microwave plasma parameters were studied. The macroscopic parameters results show increasing of microwave plasma jet length with increasing of applied voltage, argon gas flow rate where the plasma jet length exceed 12 cm as maximum value. While the increasing of argon gas flow rate will cause increasing into the argon gas temperature, where argon gas temperature the exceed 350 ? as maximum value and study the effect of gas flow rate on the optical properties

Facile growth of centimeter-sized single-crystal graphene on copper foil at atmospheric pressure

2015 ◽  
Vol 3 (15) ◽  
pp. 3530-3535 ◽  
Author(s):  
Jing Li ◽  
Xuan-Yun Wang ◽  
Xing-Rui Liu ◽  
Zhi Jin ◽  
Dong Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Copper Foil ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Single Crystalline ◽  
Slowing Down ◽  
Cu Foil

By mildly oxidizing Cu foil and slowing down the gas flow rate, centimeter-sized single-crystalline graphene was grown on Cu at atmospheric pressure.

Wpływ warunków środowiskowych i instalacyjnych na proces wymiany ciepła w wybranych przemysłowych gazomierzach miechowych

Nafta-Gaz ◽  
2020 ◽  
Vol 76 (11) ◽  
pp. 828-836
Author(s):  
Adrian Dudek ◽  
Keyword(s):  
Heat Exchange ◽  
Ambient Temperature ◽  
Flow Rate ◽  
Gas Flow ◽  
Exchange Process ◽  
Test Results ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Heat Exchange Process ◽  
The Relationship

Since 2016, Oil and Gas Institute – National Research Institute (INiG – PIB) has been conducting new research to determine the relationship between ambient temperature and gas temperature in industrial diaphragm gas meters during the measurement, and to develop new recommendations for billing systems using industrial diaphragm gas meters with a throughput of until 25 m3/h. In the first stage, work was carried out, in which the obtained test results confirmed that the heat exchange process in an industrial diaphragm gas meter depends on the ambient temperature, the gas temperature at the inlet to the gas meter, the flow rate of the gas flowing, as well as the casing surface and the gas volume of the gas meter. In the next stage, work was carried out to determine the relationship between ambient temperature and gas temperature at the industrial diaphragm gas meter connection during the measurement. The obtained results undermined the thesis, which indicated that the gas inlet temperature is equal to the gas temperature at the depth of the gas network. In the last stage, work was carried out to determine the course of changes in gas temperature in industrial diaphragm gas meters as a function of ambient temperature and cyclical changes of the gas flow rate, which were to reflect the work of gas meters installed at customers’ premises. The analysis of the obtained test results once again showed a strong dependence of the gas temperature inside industrial diaphragm gas meters on the ambient temperature, but also on the flow rate of gas. The obtained results of laboratory tests will be used to carry out a thermodynamic description of the heat exchange process in an industrial diaphragm gas meter, which would allow the determination of the gas billing temperature as a function of the ambient temperature, the temperature of the inflowing gas and the gas flow rate. The calculated gas temperature values could be used to determine the temperature correction factors applicable when settling gas consumers billed on the basis of measurement with the use of industrial diaphragm gas meters.

Heat Transfer in the Non-reacting Zone of a Cement Rotary Kiln

1996 ◽  
Vol 118 (1) ◽  
pp. 169-172 ◽  
Author(s):  
P. S. Ghoshdastidar ◽  
V. K. Anandan Unni
Keyword(s):  
Heat Transfer ◽  
Flow Rate ◽  
Rotary Kiln ◽  
Gas Flow ◽  
Transfer Model ◽  
Temperature Profiles ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Steady State Heat ◽  
Steady State Heat Transfer

This paper presents a steady-state heat transfer model for a rotary kiln used for drying and preheating of wet solids with application to the non-reacting zone of a cement rotary kiln. A detailed parametric study indicates that the influence of the controlling parameters such as percent water content (with respect to dry solids), solids flow rate, gas flow rate, kiln inclination angle and the rotational speed of the kiln on the axial solids and gas temperature profiles and the total predicted kiln length is appreciable.

scholarly journals The Effect of Mass Transfer Rate-Time in Bubbles on Removal of Azoxystrobin in Water by Micro-Sized Jet Array Discharge

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1169
Author(s):  
Feng Chen ◽  
Dezheng Yang ◽  
Feng Yu ◽  
Yang Kun ◽  
Ying Song
Keyword(s):  
Mass Transfer ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Applied Voltage ◽  
Transfer Rate ◽  
Gas Flow ◽  
Mass Transfer Rate ◽  
Initial Solution ◽  
Solution Temperature ◽  
Gas Flow Rate

In this work, the azoxystrobin removal in water by using a micro-size discharge array was investigated, and the removal efficiency can reach as high as 98.1% after 9 min plasma treatment as well as the energy utilization being only 0.73 g/(kW·h). Based on the relationship between the generation of gas bubbles and parameters of gas-liquid discharge, it was found that the variation of applied voltage, gas flow rate and initial solution temperature could cause particle number change, mass transfer rate change and the mass transfer time change, which significantly affected the practical applications at last. The experimental results indicated that when gas flow rate was 0.7 SLM (Standard Liter per Minute) and the initial solution temperature was 297 K with the applied voltage of 8 kV and discharge frequency of 6 kHz, the removal efficiency of azoxystrobin achieved maximum. Based on the analysis results of liquid mass spectrometry, the removal pathways of azoxystrobin were supposed by the decomposed by-products. Toxicity tests indicated that the decomposed products were safe and non-toxic. So, this study may reveal an azoxystrobin degradation mechanism and provide a safe, reliable and effective way for azoxystrobin degradation.

OPTIMIZATION OF NON THERMAL PLASMA REACTOR PERFORMANCE FOR THE DECOMPOSITION OF XYLENE

2016 ◽  
Vol 78 (8) ◽  
Author(s):  
Nor Faraliana Shazwani Nor Azmi ◽  
Abdullahi Mohammed Evuti ◽  
Mohd Ariffin Abu Hassan ◽  
R. K. Raja Ibrahim
Keyword(s):  
Flow Rate ◽  
Thermal Plasma ◽  
Applied Voltage ◽  
Gas Flow ◽  
Plasma Reactor ◽  
Gas Flow Rate ◽  
Reactor Performance ◽  
Model Predictions ◽  
Non Thermal Plasma ◽  
Discharge Gap

Non Thermal Plasma (NTP) is an emerging method used for the decomposition of volatile organic compounds (VOCs). This research focuses on the optimization of NTP reactor performance for decomposition of xylene from wastewater using response surface methodology (RSM) by operating the NTP reactor at applied voltage of 12-15 kV, discharge gap of 2.0-3.0 cm and gas flow rate of 2.0-5.0 L/min. An optimum xylene removal efficiency of 81.98% was obtained at applied voltage 15kV, discharge gap 2.09cm and gas flow rate at 2.36 L/min. The experimental removal efficiencies and model predictions were in close agreement with an error of 0.63%. 

Computer Simulation of Drying of Food Products With Superheated Steam in a Rotary Kiln

2010 ◽  
Author(s):  
Koustubh Sinhal ◽  
P. S. Ghoshdastidar ◽  
Bhaskar Dasgupta
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Flow Rate ◽  
Rotary Kiln ◽  
Rotational Speed ◽  
Gas Flow ◽  
Superheated Steam ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Refractory Wall

The present work reports a computer simulation study of heat transfer in a rotary kiln used for drying and preheating food products such as fruits and vegetables with superheated steam at 1 bar. The heat transfer model includes radiation exchange among the superheated steam, refractory wall and the solid surface, conduction in the refractory wall, and the mass and energy balances of the steam and solids. Finite-difference techniques are used, and the steady state thermal conditions are assumed. The false transient approach is used to solve the wall conduction equation. The solution is initiated at the inlet of the kiln, and proceeds to the exit. The output data consist of distributions of the refractory wall temperature, solid temperature, steam temperature, and the total kiln length. The inlet of the kiln is the outlet of the gas (superheated steam), since the gas flow is countercurrent to the solid. Thus, for a fixed solid and gas temperature at the kiln inlet, the program predicts the inlet temperature of the gas (i.e. at the kiln exit) in order to achieve the specified exit temperature. In the absence of experimental results for food drying in a rotary kiln, the present model has been satisfactorily validated against numerical results of Sass [1] for drying of wet iron ore in a rotary kiln. The results are presented for drying of apple and carrot pieces. A detailed parametric study indicates that the influence of controlling parameters such as percent water content (with respect to dry solids), solids flow rate, gas flow rate, kiln inclination angle and the rotational speed of the kiln on the axial solids and gas temperature profiles and the total predicted kiln length is appreciable. The study reveals that a good design of a rotary kiln requires medium gas flow rate, small angle of inclination and low rotational speed of the kiln.

Sign in / Sign up

Export Citation Format

Share Document