Accurate measurement of pressure differences and the effect of baffle on pressure distribution in vacuum chamber during dynamic gas flow

2010 ◽  
Vol 10 (2) ◽  
pp. 538-543 ◽  
Author(s):  
Wakil Khan ◽  
I.M. Choi ◽  
J.Y. Lim ◽  
S.S. Hong
Keyword(s):  
Pressure Distribution ◽  
Gas Flow ◽  
Vacuum Chamber

Mass Transfer Coefficients during Steel Decarburization in a RH Degasser

2008 ◽  
Vol 273-276 ◽  
pp. 679-684
Author(s):  
Roberto Parreiras Tavares ◽  
André Afonso Nascimento ◽  
Henrique Loures Vale Pujatti
Keyword(s):  
Mass Transfer ◽  
Reynolds Number ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Gas Flow ◽  
Vacuum Chamber ◽  
Volumetric Mass Transfer Coefficient ◽  
Gas Flow Rate ◽  
Rh Process ◽  
Kinetics Of

The RH process is a secondary refining process that can simultaneously attain significant levels of removal of interstitial elements, such as carbon, nitrogen and hydrogen, from liquid steel. In the RH process, the decarburization rate plays a very important role in determining the productivity of the equipment. The kinetics of this reaction is controlled by mass transfer in the liquid phase. In the present work, a physical model of a RH degasser has been built and used in the study of the kinetics of decarburization. The effects of the gas flow rate and of the configurations of the nozzles used in the injection of the gas have been analyzed. The decarburization reaction of liquid steel was simulated using a reaction involving CO2 and caustic solutions. The concentration of CO2 in the solution was evaluated using pH measurements. Based on the experimental results, it was possible to estimate the reaction rate constant. A volumetric mass transfer coefficient was then calculated based on these rate constants and on the circulation rate of the liquid. The logarithm of the mass transfer coefficient showed a linear relationship with the logarithm of the gas flow rate. The slope of the line was found to vary according to the relevance of the reaction at the free surface in the vacuum chamber. A linear relationship between the volumetric mass transfer coefficient and the nozzle Reynolds number was also observed. The slopes of the lines changed according to the relative importance of the two reaction sites, gas-liquid interface in the upleg snorkel and in the vacuum. At higher Reynolds number, the reaction in the vacuum chamber tends to be more significant.

Pressure distribution in gas flow in the presence of a fibrous filter in the channel

1976 ◽  
Vol 31 (2) ◽  
pp. 922-924
Author(s):  
B. I. Ogorodnikov ◽  
V. I. Skitovich ◽  
V. I. Khabarov
Keyword(s):  
Pressure Distribution ◽  
Gas Flow ◽  
Fibrous Filter

Analysis of pressure distribution for the various gas flow vacuum system in the range from 1Pa to 133Pa

Measurement ◽  
2013 ◽  
Vol 46 (2) ◽  
pp. 851-854
Author(s):  
S.S. Hong ◽  
Wakil khan ◽  
Y.K. Park ◽  
Y.H. Shin
Keyword(s):  
Pressure Distribution ◽  
Gas Flow ◽  
Vacuum System

Effect of Solid Particles on Turbine Performance

1976 ◽  
Vol 98 (1) ◽  
pp. 47-52 ◽  
Author(s):  
W. Tabakoff ◽  
W. Hosny ◽  
A. Hamed
Keyword(s):  
Pressure Distribution ◽  
Gas Flow ◽  
Theoretical Method ◽  
Solid Particles ◽  
Injection System ◽  
Particle Injection ◽  
Turbine Efficiency ◽  
Turbine Performance ◽  
Experimental Pressure ◽  
Good Agreement

A theoretical method was developed for predicting the pressure distribution over a blade in cascade for a compressible flow with solid particles. Experimental results were obtained from a cascade wind tunnel equipped with a solid particle injection system. Good agreement was noted between the theoretical and experimental pressure distribution. The change in pressure due to the particles gives reduction in the force on the blades. The presence of solid particles in air-breathing engine gas flow changes the turbine performance. The overall turbine efficiency decreases as a result of the introduction of solid particles. The performance experiment was performed on a two-stage velocity-compounded turbine.

scholarly journals MATHEMATICAL MODELLING OF RF PLASMA AT LOW PRESSURES FOR CYLINDRIC VACUUM CHAMBER WITH CHARGED SPECIMAN

2022 ◽  
pp. 44-49
Author(s):  
Александр Юрьевич Шемахин ◽  
Виктор Семенович Желтухин ◽  
Евгений Юрьевич Шемахин
Keyword(s):  
Gas Flow ◽  
Vacuum Chamber ◽  
Boundary Value ◽  
Initial Boundary ◽  
Initial Boundary Value Problem ◽  
Rf Plasma ◽  
Neutral Gas ◽  
Potential Part ◽  
Potential Component ◽  
Initial Boundary Value

Для моделирования процессов в ВЧ-плазме пониженного давления с продувом газа разработана гибридная математическая модель при числах Кнудсена - для несущего газа. Модель включает начально-краевую задачу для кинетического уравнения Больцмана, описывающего функцию распределения несущего нейтрального газа, краевые задачи для уравнения неразрывности электронной, ионной и метастабильной компонент, уравнения сохранения энергии электронов, для ВЧ-уравнений Максвелла в форме телеграфных уравнений и уравнения Пуассона для потенциальной составляющей поля. Приводятся результаты расчета электрической напряженности, концентрации электронов, ионов и метастабилей, потенциальной составляющей электромагнитного поля в цилиндрической вакуумной камере. A hybrid mathematical model for the Knudsen numbers - for the carrier gas has been developed to simulate processes in a low pressure RF plasma with gas flow. The model includes an initial boundary value problem for the kinetic Boltzmann equation describing the distribution function of the carrier neutral gas, boundary value problems for the continuity equation of the electronic, ionic and metastable components, the electron energy conservation equations, for Maxwell’s RF equations in the form of telegraphic equations and the Poisson equation for the potential part of field. The results of the calculation of the electric intensity, the concentration of electrons, iones and metastables, the potential component of the electromagnetic field in a cylindrical vacuum chamber are presented.

The Study of the Ventilation Influence to Gas-Based Direct Reduction Shaft Furnace Flow Field

2013 ◽  
Vol 405-408 ◽  
pp. 2990-2993
Author(s):  
Ming Hua Bai ◽  
Jun Li Ge ◽  
Ying Min Piao ◽  
Jian Wang ◽  
Yuan Xiang Fu ◽  
...  
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Gas Flow ◽  
Shaft Furnace ◽  
Direct Reduction ◽  
Gas Velocity ◽  
Reducing Gas ◽  
Key Factor ◽  
Reduction Section ◽  
Furnace Reduction

Direct reduced iron (DRI) shaft furnace flow field has important influence to the DRI production process, and the ventilation is a key factor for the velocity and pressure distribution of the gas flow in the furnace. At present works, the direct reducing gas velocity distribution and pressure distribution of DRI shaft furnace were studied with different ventilation. By the analysis of numerical simulation, the result was found that the direct reducing gas velocity increase with height in the shaft furnace reduction section. The velocity of the direct reducing gas augment with the increase of ventilation. The direct reducing gas pressure add with increasing height in the shaft furnace reduction section. With ventilation increasing, the pressure of the shaft furnace ventral part increase, and the pressure gradient increase in the direction of height in the DRI shaft furnace.

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