scholarly journals ANALYSIS OF INTENSIVELY BLASTED ELECTRIC ARC BURNING IN THE ARC HEATER'S ANODE CHANNEL

2016 ◽  
Vol 56 (5) ◽  
pp. 395-401 ◽  
Author(s):  
Josef Senk ◽  
Ivana Jakubova ◽  
Ilona Laznickova
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Power Loss ◽  
Gas Flow ◽  
Measured Data ◽  
Electric Arc ◽  
Gas Flow Rate ◽  
Voltage Distribution ◽  
Current Voltage ◽  
Arc Heater

The paper deals with the description of the intensively blasted electric arc burning in Ar in the anode channel of the arc heater operated under various conditions. Directly measured experimental data (current, voltage, gas flow rate, power loss) characterize the operation of the device as a whole, but important parameters describing the electric arc inside (its geometry, temperature and voltage distribution) must be revealed using a mathematical model of the arc. An updated version of the model is introduced and used for analysis of two exemplary sets of measured data. The results are given in figures and commented.

On the Relationship Between Added Mass and Added Damping

2002 ◽  
Author(s):  
H. G. D. Goyder
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Strong Dependence ◽  
Fluid Pressure ◽  
Theoretical Models ◽  
Added Mass ◽  
Measured Data ◽  
Interesting Consequence ◽  
Phase Angles ◽  
The Relationship

A surprising relationship exists between the amplitude and phase of a vibrating system. For an item vibrating in a fluid flow the phase of the fluid pressure (relative to the motion of the structure) can be deduced from the amplitude of the pressure. This strong dependence of the phase on the amplitude provides a means for checking the correctness of measured data and severely constrains the form that a mathematical model can take. The relationship between amplitude and phase is completely general and the paper gives various examples from theoretical models and experimental data. One interesting consequence of this relationship follows from the observation that phase angles only exist because of damping. Hence damping, due to the fluid, is linked to added mass.

A mathematical model of the arc in electric arc welding including shielding gas flow and cathode spot location

1995 ◽  
Vol 28 (9) ◽  
pp. 1840-1850 ◽  
Author(s):  
R Ducharme ◽  
P Kapadia ◽  
J Dowden ◽  
M Thornton ◽  
I Richardson
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Cathode Spot ◽  
Gas Flow ◽  
Electric Arc ◽  
Shielding Gas ◽  
Electric Arc Welding

Current-voltage characteristics and emf of an electric-arc heater operating with various gases

1967 ◽  
Vol 12 (6) ◽  
pp. 375-379 ◽  
Author(s):  
F. B. Yurevich ◽  
M. V. Volk-Levanovich ◽  
A. G. Shashkov
Keyword(s):  
Electric Arc ◽  
Current Voltage ◽  
Arc Heater ◽  
Current Voltage Characteristics

Modeling of Weld Dilution in Gas Metal Arc Welding Process Using Taguchi's Design of Experiments

2011 ◽  
Vol 110-116 ◽  
pp. 2963-2968 ◽  
Author(s):  
Masood Aghakhani ◽  
Ehsan Mehrdad ◽  
Ehsan Hayati ◽  
Maziar Mahdipour Jalilian ◽  
Arash Karbasian
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Welding Parameters ◽  
Gas Flow Rate ◽  
Metal Arc Welding ◽  
Wire Feed ◽  
Plate Distance

Gas metal arc welding is a fusion welding process which has got wide applications in industry. In order to obtain a good quality weld, it is therefore, necessary to control the input welding parameters. In other words proper selection of input welding parameters in this process contribute to weld productivity. One of the important welding output parameters in this process is weld dilution affecting the quality and productivity of weldment. In this research paper using Taguchi method of design of experiments a mathematical model was developed using parameters such as, wire feed rate (W), welding voltage (V), nozzle-to-plate distance (N), welding speed (S) and gas flow rate (G) on weld dilution. After collecting data, signal-to-noise ratios (S/N) were calculated and used in order to obtain the optimum levels for every input parameter. Subsequently, using analysis of variance the significant coefficients for each input factor on the weld dilution were determined and validated. Finally a mathematical model based on regression analysis for predicting the weld dilution was obtained. Results show that wire feed rate (W),arc voltage (V) have increasing effect while Nozzle-to-plate distance (N) and welding speed (S) have decreasing effect on the dilution whereas gas Flow rate alone has almost no effect on dilution but its interaction with other parameters makes it quite significant in increasing the weld dilution

Mathematical modeling of aluminum degassing by the impeller injector technique validated by a physical modeling

2014 ◽  
Vol 1611 ◽  
pp. 49-54 ◽  
Author(s):  
M. Hernández-Hernández ◽  
W. F. Cruz-Mendez ◽  
C. Gonzalez-Rivera ◽  
M. A. Ramírez-Argáez
Keyword(s):  
Mathematical Model ◽  
Physical Model ◽  
Gas Flow ◽  
Process Analysis ◽  
Liquid Aluminum ◽  
Bubble Diameter ◽  
Operating Parameter ◽  
Gas Flow Rate ◽  
The Mathematical Model ◽  
Kinetics Of

ABSTRACTA mathematical model is developed to describe deoxidation of water in a physical model of a batch aluminum degassing reactor equipped with the rotor-injector technique, assuming that deoxidation kinetics of water is similar to dehydrogenization of liquid aluminum. Degassing kinetics is described by using mass transport and mass balance principles by assuming that degassing kinetics can be characterized by a mass transfer coefficient, which depends on the process variables. The transport coefficient and the average bubble diameter are estimated with correlations reported in the literature for similar gas-injection systems. The water physical model helped to validate the mathematical model and to perform a process analysis by varying: 1) Gas flow rate (20 and 40 l/min); and 2) Impeller’s angular velocity (290 and 573 rpm). Results from the model agree well with measurements of deoxidation kinetics at low impeller rotating speeds. At high rotating speeds the model is still valid but less reliable because it does not take into account the formation of the vortex at the free surface. Nevertheless, the model provides predictions of the influence of every operating parameter and it can be used as a good approximation for real systems.

Thermodynamic analysis of the rotary tooth compressor

2002 ◽  
Vol 216 (4) ◽  
pp. 321-327 ◽  
Author(s):  
X Peng ◽  
Z Xing ◽  
L Li ◽  
P Shu
Keyword(s):  
Mathematical Model ◽  
Experimental Test ◽  
Power Loss ◽  
Gas Flow ◽  
Analytical Study ◽  
Test Results ◽  
Gas Leakage ◽  
Efficient Alternative ◽  
The Mathematical Model ◽  
Thermodynamic Processes

The Roots blower has no built-in compression and therefore is not efficient when it discharges gases at pressures substantially higher than at suction. The rotary tooth compressor, which includes built-in compression, has been proposed as a more efficient alternative. This paper describes an analytical study of the rotary tooth compressor. A mathematical model has been constructed to simulate the thermodynamic processes within it and hence predict its performance. The model allows for gas leakage as well as the main gas flow into and out of the working chamber. The estimated performance has been compared with experimental test results. The mathematical model was thereby validated. Further analyses were then carried out, using the validated mathematical model, to determine the magnitude of power and capacity losses in the machine. It is shown that the rotary tooth compressor is more efficient than the Roots blower at pressure ratios greater than about 1.4. Loss in capacity is most affected by gas leakage, and the main cause of loss in adiabatic efficiency is the power loss associated with high gas velocities during discharge.

Photothermal Sorption of Gases in Porous Glass

2003 ◽  
Vol 10 (02n03) ◽  
pp. 283-288
Author(s):  
Andriy Dmytruk ◽  
Tetsuro Jin ◽  
Hong Lin ◽  
Tetsuo Yazawa
Keyword(s):  
Experimental Data ◽  
Porous Glass ◽  
Gas Flow ◽  
Pore Diameter ◽  
Gas Permeability ◽  
Temperature Modulation ◽  
Theoretical Estimation ◽  
Gas Flow Rate ◽  
Time Modulation ◽  
Glass Membrane

Gas permeability of CO2, N2 and He gases through a porous glass membrane of 3.5 nm pore diameter was investigated experimentally. Changes of the gas flow rate under Xe-lamp irradiation have been found. The observed phenomenon is explained by photothermal sorption. Estimation of gas permeability has been carried out. Experimental data of the induced gas permeability are in agreement with the theoretical estimation. A new method for gas separation by time modulation of the membrane temperature is proposed in which temperature modulation occurs by periodical heating of the membrane by the irradiation.

Study on Similarity of Pump Blade Adjusting Performances

2013 ◽  
Author(s):  
Yuan Yao ◽  
Liu Chao
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Model Test ◽  
Power Flow ◽  
Measured Data ◽  
Least Square ◽  
Flow Index ◽  
Blade Angle ◽  
Flow Curves ◽  
Pump Impeller

Through analyzing the change in velocity triangles at the inlet and exit of pump impeller with blade adjusting, and the flow behaviors in the pump passage the pump blade adjusting formulae were derived which reflect the similarity of flow and pumping head with the blade angles adjusted. Based on the experimental data of pump performances a mathematical model was developed to calculate the flow index and head index of the formulae. The objective function is a minimized the least square sum of the errors of the formulae’s calculation and the test data. The formulae were applied to three model pumps. The results show that the errors between calculated and measured data are 0.0228, 0.0116%, 0.0123 respectively, and all the head-flow curves (H-Q) and the power-flow curves (P-Q) agree well with the measured data from model test. Therefore, the derived formulae are featured with good similarity in pump performances for change blade angle, which can be applicable to the performances conversion and prediction of pump with blade adjusting.

Characteristics of the Dead Zones in RH Desgasser with Simulation Methods

2015 ◽  
Vol 817 ◽  
pp. 755-763 ◽  
Author(s):  
De Liang Niu ◽  
Qing Cai Liu ◽  
Dong Ran Ma ◽  
Jian Yang ◽  
Min Ren Xu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Flow Rate ◽  
Molten Steel ◽  
Physical Modeling ◽  
Gas Flow ◽  
Dead Zone ◽  
Immersion Depth ◽  
Gas Flow Rate ◽  
Iron And Steel ◽  
Dead Zones

A mathematical model has been constructed for simulating the RH degasser of an iron and steel Co. Ltd. The flow field of molten steel in the ladle has been investigated; in addition, it is also investigated through physical modeling study. The main objective of the investigation was to assess the influence of gas flow rate and immersion depth on dead zones in the ladle. The results show that the flow pattern of molten steel in RH degasser can be well represented by the mathematical model and the physical model. Except the areas close to the free surface and the zones between the two snorkels and the sidewall in the ladle, these dead zones can be reduced by increasing of gas flow rate and immersion depth. These dead zones were marked with 1, 2, 3, results calculated by mathematical modeling are in good agreement with which obtained by means of physical modeling (water modelling) study increasing of immersion depth could markedly reduce the area of dead zone 3, yet the area of dead zone 1 and 2 could be markedly reduced by increasing the gas flow rate, hence indicate that mixing of dead zones could be intensified through improving gas flow rate and immersion depth.

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