scholarly journals Demystifying Underlying Fluid Mechanics of Gas Stirred Ladle Systems with Top Slag Layer Using Physical Modeling and Mathematical Modeling

2019 ◽  
Vol 59 (7) ◽  
pp. 1224-1233 ◽  
Author(s):  
Rodolfo D. Morales ◽  
Fabian Andres Calderon-Hurtado ◽  
Kinnor Chattopadhyay
Keyword(s):  
Mathematical Modeling ◽  
Fluid Mechanics ◽  
Physical Modeling ◽  
Slag Layer ◽  
Top Slag

Swirling Jet Mixing of a Bath Covered With a Top Slag Layer

2007 ◽  
pp. 839-840
Author(s):  
M. Iguchi ◽  
Y. Sasaki ◽  
D. Iguchi ◽  
T. Ohmi
Keyword(s):  
Slag Layer ◽  
Jet Mixing ◽  
Swirling Jet ◽  
Top Slag

scholarly journals The study of dynamical processes in problems of mesofracture layers exploration seismology by methods of mathematical and physical simulation

2021 ◽  
Vol 13 (1) ◽  
pp. 71-78
Author(s):  
Maxim V. Muratov ◽  
◽  
Polina V. Stognii ◽  
Igor B. Petrov ◽  
Alexey A. Anisimov ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Physical Modeling ◽  
Physical Simulation ◽  
Multiple Reflections ◽  
Hybrid Schemes ◽  
Diffracted Waves ◽  
Fracture Models ◽  
Exploration Seismology ◽  
Computational Resources ◽  
Propagation Of Elastic Waves

The article is devoted to the study of the propagation of elastic waves in a fractured seismic medium by methods of mathematical modeling. The results obtained during it are compared with the results of physical modeling on similar models. For mathematical modeling, the grid-characteristic method with hybrid schemes of 1-3 orders with approximation on structural rectangular grids is used. The ability to specify inhomogeneities (fractures) of various complex shapes and spatial orientations has been implemented. The description of the developed mathematical models of fractures, which can be used for the numerical solution of exploration seismology problems, is given. The developed models are based on the concept of an infinitely thin fracture, the size of the opening of which does not affect the wave processes in the fracture area. In this model, fractures are represented by boundaries and contact boundaries with different conditions on their surfaces. This approach significantly reduces the need for computational resources by eliminating the need to define a mesh inside the fracture. On the other hand, it allows you to specify in detail the shape of fractures in the integration domain, therefore, using the considered approach, one can observe qualitatively new effects, such as the formation of diffracted waves and a multiphase wavefront due to multiple reflections between the surfaces, which are inaccessible for observation when using effective fracture models actively used in computational seismic. The obtained results of mathematical modeling were verified by physical modeling methods, and a good agreement was obtained.

Situational model of technological operations for secondary metallurgy

2018 ◽  
Vol 1 (89) ◽  
pp. 27-34
Author(s):  
O. Zhadanos ◽  
I. Derevyanko ◽  
D. Chaika ◽  
O. Kukushkin
Keyword(s):  
Mathematical Modeling ◽  
Energy Efficiency ◽  
Dynamic Programming ◽  
Slag Layer ◽  
Maximum Energy ◽  
Start Time ◽  
Efficient Treatment ◽  
Situational Model ◽  
State Charts ◽  
Methods Analytical

Purpose: The aim of this study was development of a computer situational model of heat and power processes and transport operations for secondary steelmaking (SSM) to evaluate the effectiveness of the proposed SSM energy regimes and minimization the consumption of energy resources. Design/methodology/approach: For the solution of the tasks were used next methods: analytical and statistical methods of mathematical modeling; method of dynamic programming for the development of technological recommendations for energy modes on LF; Harel state charts to evaluate the effectiveness of the applied models. Findings: In order to provide rational energy regimes for SSM, it is necessary to introduce a new controlled parameter - the optimum time to start heating the melt at the ladle furnace unit (LF), which is determined by solving the dynamic programming task. The melt heating start time must be selected in such a way as to ensure that all the necessary technological operations are performed during metal processing in the LF, taking into account schedule constraints, and that the heating of the metal must be carried out with the maximum energy efficiency. Research limitations/implications: The main objective of the present study was to apply the mathematical modeling methods to ensure rational energy regimes of SSM. Practical implications: The developed situational model of technological operations for SSM will allow finding reserves to increase the productivity and quality of the process, and to evaluate the effectiveness of new technological solutions. Originality/value: To ensure an energy-efficient treatment of steel in LF, it is necessary: the time for starting the heating of the metal is chosen such that the energy efficiency of the LF, which depends on the thickness of the slag layer, is maximum at each stage; increase the power that is supplied to the heating of the melt by switching the voltage taps of the transformer as the thickness of the slag cover increases.

Influence of the top slag layer on the flow dynamics in AC-electric arc furnaces

2010 ◽  
Vol 2 (4) ◽  
pp. 217 ◽  
Author(s):  
M.A. Ramirez Argaez ◽  
A.N. Conejo ◽  
Y.I.C. Guzman ◽  
G. Trapaga
Keyword(s):  
Slag Layer ◽  
Electric Arc ◽  
Flow Dynamics ◽  
Electric Arc Furnaces ◽  
Arc Furnaces ◽  
Top Slag

scholarly journals Mathematical Modeling and Simulation of Development of the Fires in Confined Spaces

2020 ◽  
Author(s):  
Ivan Antonov ◽  
Rositsa Velichkova ◽  
Svetlin Antonov ◽  
Kamen Grozdanov
Keyword(s):  
Mathematical Modeling ◽  
Fluid Mechanics ◽  
Dynamic Simulation ◽  
Turbulence Models ◽  
Solution Model ◽  
Computational Fluid Mechanics ◽  
Confined Space ◽  
Confined Spaces ◽  
Story Building ◽  
Over Time

The mathematical models of fire distribution in a confined space–in underground garages and in buildings—are described. Integral and computational fluid mechanics methods are used. The chapter presents the results of a fire simulation using the software Fluent. It uses Reynolds-type turbulence models of the Fire Dynamic Simulation or PyroSim graphical interface with a solution model describing a turbulence. For both cases, the pictures of the spread of fire and smoke over time in an atrium of an administrative building and a five-story building of the TUS were presented.

scholarly journals MODELING OF CONTROL OF SPEED CONTROL DRIVE AND SLEW MECHANISM DRIVE OF HIGH-SPEED CATERPILLAR VEHICLE WITH BORDER GEARBOX

2020 ◽  
Vol 2020 (12) ◽  
pp. 57-65
Author(s):  
Sergey Horoshilov ◽  
Sergey Kondakov ◽  
Ol'ga Pavlovskaya
Keyword(s):  
Mathematical Modeling ◽  
Physical Modeling ◽  
High Speed ◽  
Experimental Investigations ◽  
Current Trends ◽  
Reliable Model ◽  
Vehicle Acceleration ◽  
Caterpillar Vehicles ◽  
Optimum Solution ◽  
Numerous Parameter

The relevance of the topic of investigation is connected with the current trends in gearbox automation and request to lighten slew control of caterpillar vehicles. The purpose set can’t be achieved only in a physical modeling of a drive: the problem is too multiversion and a physical modeling does not guarantee an optimum solution. The scientific novelty of the investigation consists in the authors’ creation of simulator of gearbox drive and slew mechanism drive consisting of an electromotor, a planetary reducer, a crank mechanism, a hydraulic distributor and hydro-cylinder. As a consequence, there is realized a parametric investigation possibility of drive numerous parameter impact upon its performance characteristics. By means of the mathematical modeling the drive parameters ensuring the fulfillment of the requirements specification are substantiated. In the second part of the paper there are shown modeling results of caterpillar vehicle acceleration in a low and the fourth gears and a slew at a speed of 5 m/sec. The result comparison of mathematical modeling and experimental investigations is carried out. The data of experiments, in which took part the authors of the paper, confirm completely the adequacy of the simulator developed. In such a way, the simulator of caterpillar vehicle motion is supplemented with the reliable model of a gearbox drive and a slew mechanism drive in machinery with the border gearboxes. The paper material is used in the design of a similar drive of a new machine.

Effect of Interfacial Tension on the Emulsification of Slag - Considerations on the CFD Modelling of Dispersion

2013 ◽  
Vol 762 ◽  
pp. 242-247 ◽  
Author(s):  
Petri Sulasalmi ◽  
Ville Valtteri Visuri ◽  
Timo Fabritius
Keyword(s):  
Interfacial Tension ◽  
Droplet Diameter ◽  
Slag Layer ◽  
Phase System ◽  
Cfd Modelling ◽  
Factors Affecting ◽  
Significant Phenomenon ◽  
Dominant Property ◽  
Computational Fluid Dynamics Cfd ◽  
Top Slag

Top slag emulsification is a significant phenomenon in refining metallurgy. During bottom-or side-blowing, the flowing steel detaches small droplets from the top slag. The interfacial energy between liquid slag and steel is one of the most important factors affecting to emulsification. Surface energy, which can be described by interfacial tension, is the dominant property when determining slag emulsification. During chemical reactions, mass transfer between the phases decreases the interfacial tension at the slag-steel interface. The change in the interfacial tension affects the droplet formation.In this paper, the effect of interfacial tension on the emulsification was studied with Computational Fluid Dynamics (CFD) modelling. Three cases were simulated by considering a 3-phase system consisting of slag, steel and gas. A small area, where a 15 mm slag layer lies on top of the liquid steel, was simulated applying three different interfacial tensions, while keeping other properties unaltered. Gas was included to enable a free slag top-surface. The droplet diameter, size distribution and amount of droplets are in the scope of interest. It was found that the Sauter mean diameter of the slag droplets increased as the interfacial tension increased. The emulsification fraction varied between 1.621.95%.

Mathematical Modeling of Draining of Dual-Strand Caster Tundish With Unequal Throughputs at United States Steel Corporation

2013 ◽  
Author(s):  
Asish K. Sinha ◽  
Thomas J. Piccone ◽  
Paul D. Miller
Keyword(s):  
Mathematical Modeling ◽  
United States ◽  
Fluid Dynamics ◽  
Transient Flow ◽  
Slag Layer ◽  
The Other ◽  
Flow Modeling ◽  
Two Phase ◽  
United States Steel Corporation ◽  
Initial Slag

Mathematical modeling of the tundish draining process was undertaken in response to the pouring of slag into the caster mold during draining of the dual-strand caster tundish at one of United States Steel Corporation’s plants before a tundish change. It was observed upon dumping of the tundish that the tundish skull was mostly slag on one side (the strand with the slag in the mold) and nearly all steel on the other. The current study attempted to reproduce the tundish draining event via mathematical modeling using the PHOENICS computational fluid dynamics software. The tundish draining was modeled for the case where the throughput of one strand was double that of the other strand. Transient flow modeling of the draining process included solving for the pressure and velocities for the two-phase slag-steel flows for two cases, one with a 6-inch thick slag layer and one with a 2-inch slag layer. The results showed that the draining process was affected significantly by the thickness of the initial slag layer. The simulations also qualitatively predicted the tendency of the slag to accumulate on the side with the higher throughput during tundish draining for a dual-strand tundish containing dams on both sides of the pouring area in the center.

scholarly journals Investigation of the effect of slag on mixing of a bucket bath at bottom blowing by a method of physical modeling

2018 ◽  
Author(s):  
V.P. Piptyuk ◽  
P.G. Prokopenko ◽  
S.V. Grekov ◽  
G.O. Andrievsky
Keyword(s):  
Electrical Conductivity ◽  
Mass Transfer ◽  
Surface Area ◽  
Physical Modeling ◽  
Air Flow ◽  
Slag Layer ◽  
Ladle Furnace ◽  
Hydrodynamic Processes ◽  
Bottom Blowing ◽  
Slag Component

The purpose of the work is to determine the effect of slag on the processes of mixing the steel melt in the ladle during its bottom purge. The study by physical modeling was carried out on a transparent bucket model with its bottom purge without slag layer and, if any, it was present. Water was used as the liquid of the metal, and slag was sunflower oil. The bath was washed with air at various costs. Controled the thickness of the slag layer and the surface area of the metal surface from it. The level of conductivity of a water bath was determined depending on the variables. A slight decrease in the electrical conductivity of the melt mist (water) in the presence of slag is observed, as well as an increase in the thickness of the slag layer and the surface area of the melt surface with increasing air flow. The factors which can be applied for the calculation of hydrodynamic processes during the processing of steel on the "ladle-furnace" installation, taking into account the slag component, are revealed. It is shown that when the air flow increases, the diameter of the water released from the slag (oil) increases, and when the volume of the latter is stored, the thickness of its layer increases. The expediency of continuation of researches by cold physical modeling of hydrodynamics, heat and mass transfer with and without slag is shown, which will allow them to be taken into account in hot modeling and in industrial conditions.

Sign in / Sign up

Export Citation Format

Share Document