Computational Analysis of a Three-Dimensional Plasma Spray Jet

1997 ◽  
Author(s):  
B. Dussoubs ◽  
P. Fauchais ◽  
A. Vardelle ◽  
M. Vardelle ◽  
N.J. Themelis
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Control Volume ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Gas Flow Rate ◽  
Fluid Turbulence ◽  
Energy Equations ◽  
S Model ◽  
Carrier Gas Flow

Abstract An analysis of a d.c. plasma jet is presented using a three-dimensional commercial fluid dynamics code, ESTET. This code solves the coupled conservation equations of mass, species, momentum and thermal energy equations for a compressible and turbulent fluid in control volume and finite difference formulation. Computations take into account fluid turbulence using a standard k-s model with the Launder and Sharma correction for the laminar zones, e.g. the plasma core. Two series of spraying conditions differing in the total gas flow rate (30 and 60 slm) and the arc current (300 and 600 A, respectively) are computed. The process parameters are independently varied about the nominal operating conditions. The effect of the variation of primary and secondary gas flow rate, effective power and powder carrier gas flow rate on flow fields characteristics, is discussed.

Influence of the Variation of Plasma Torch Parameters on Particle Melting and Solidification

1997 ◽  
Author(s):  
M. Vardelle ◽  
P. Fauchais ◽  
A. Vardelle ◽  
A.C. Léger
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Gas Flow ◽  
Operating Conditions ◽  
Characteristic Parameters ◽  
Powder Mass ◽  
Arc Current ◽  
Plasma Sprayed ◽  
Carrier Gas Flow ◽  
Melting And Solidification

Abstract A study of the flattening and cooling of particles plasma-sprayed on a substrate is presented. The characteristic parameters of the splats are linked to the parameters of the impacting particles by using an experimental device consisting of a phase Doppler particle analyzer and a high-speed pyrometer. However, during the long experiments required to get reliable correlations, it was observed that variations in plasma spray operating conditions may alter the particles behavior in the plasma jet. Therefore, a simple and easy-to-use system was developed to control in real time the spray jet. In this paper, the effect of carrier gas flow rate, arc current and powder mass flow rate is investigated. The results on zirconia and alumina powders show the capability of the technique to sense the particle spray position and width.

Effect of shielding gas flow rate on arc behaviors in GMAW with single cable-typed wire

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040059
Author(s):  
Qingxian Hu ◽  
Lei Zhang ◽  
Juan Pu ◽  
Caichen Zhu
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Maximum Flow ◽  
Maximum Pressure ◽  
Arc Plasma ◽  
Shielding Gas ◽  
Gas Flow Rate

A three-dimensional numerical model of arc in gas metal arc welding (GMAW) with single cable-typed wire was established based on the theory of arc physics. The influences of different shielding gas flow rates on the features of temperature field, velocity field and pressure field were investigated. The results showed that the maximum velocity of arc plasma along radial direction and the arc pressure on the surface of workpieces were increased obviously with the increase of the shielding gas flow rate, while the arc temperature was changed little. This phenomenon was mainly attributed to the increasing collisions between arc plasmas and the self-rotation action of cable-typed wires. The arc temperature at the tip of the cable-typed wire reached the maximum. The maximum flow velocity of arc plasma was located at the tip of wire (2–8 mm). The arc pressures in the central axis reached the maximum pressure. The simulation results were in agreement with the experimental results.

Evaluation of the optimal carrier gas flow rate for the carbon nanotubes growth

2013 ◽  
Vol 39 (3) ◽  
pp. 258-261 ◽  
Author(s):  
A. G. Kurenya ◽  
D. V. Gorodetskiy ◽  
V. E. Arkhipov ◽  
A. V. Okotrub
Keyword(s):  
Carbon Nanotubes ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Carrier Gas Flow

Growth of InAs nanowires with the morphology and crystal structure controlled by carrier gas flow rate

2015 ◽  
Vol 430 ◽  
pp. 87-92 ◽  
Author(s):  
Ming Li ◽  
Jingyun Wang ◽  
Kan Li ◽  
Yingjie Xing ◽  
H.Q. Xu
Keyword(s):  
Crystal Structure ◽  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Inas Nanowires ◽  
Carrier Gas Flow

scholarly journals Effect of operating parameters on production of bio-oil from fast pyrolysis of maize stalk in bubbling fluidized bed reactor

2016 ◽  
Vol 18 (3) ◽  
pp. 88-96 ◽  
Author(s):  
Najaf Ali ◽  
Mahmood Saleem ◽  
Khurram Shahzad ◽  
Sadiq Hussain ◽  
Arshad Chughtai
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Gas Flow ◽  
Fast Pyrolysis ◽  
Superficial Velocity ◽  
Operating Parameters ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Bio Oil ◽  
Carrier Gas Flow

Abstract The yield and composition of pyrolysis products depend on the characteristics of feed stock and process operating parameters. Effect of particle size, reaction temperature and carrier gas flow rate on the yield of bio-oil from fast pyrolysis of Pakistani maize stalk was investigated. Pyrolysis experiments were performed at temperature range of 360-540°C, feed particle size of 1-2 mm and carrier gas fl ow rate of 7.0-13.0 m3/h (0.61.1 m/s superficial velocity). Bio-oil yield increased with the increase of temperature followed by a decreasing trend. The maximum yield of bio-oil obtained was 42 wt% at a temperature of 490°C with the particle size of around 1.0 mm and carrier gas flow rate of 11.0 m3/h (0.9 m/s superficial velocity). High temperatures resulted in the higher ratios of char and non-condensable gas.

Effects of reduction of carrier gas flow rate on sevoflurane and isoflurane consumption and costs

1998 ◽  
Vol 12 (1) ◽  
Author(s):  
Satoru Tanaka ◽  
Hideaki Tsuchida ◽  
Hajime Sonoda ◽  
Akiyoshi Namiki
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Carrier Gas ◽  
Carrier Gas Flow
Sign in / Sign up

Export Citation Format

Share Document