Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Continuous casting of steel"”.
-
Modeling the continuous casting of steel
… developed to compute the thermo-mechanical state of continuously cast steels in the casting mold. The model includes the mold in the analysis so that it fully accounts for the effects of mold distortion on the gap formed between the mold and the solidifying strand. It is solved iteratively so that …
-
Modeling of multiphase turbulent flow in continuous casting of steel
This thesis develops mathematical models of multiphase turbulent flow and investigates multiphase flow issues arising in the continuous casting process of steel through the application of the developed models. In the continuous casting of steel, argon gas injection at Upper Tundish Nozzle (UTN) …
-
An expert system to diagnose quality problems in the continuous casting of steel billets
… such as cracks, rhomboidity and breakouts are often observed in continuously cast steel billets. Although information is available in the literature on the causes of, and solutions to, these problems, the transfer of this knowledge to operating personnel is not always an easy task. To address …
-
Transient Study of Turbulent Flow and Particle Transport During Continuous Casting of Steel Slabs
… flow velocities, the motion and capture of impurity particles during continuous casting were simulated using a Lagrangian approach. A criterion was developed to model particle pushing and capture by the solidifying shell and was incorporated into the particle transport model. The …
-
Argon Bubble Behavior in Slide-Gate Tundish Nozzles During Continuous Casting of Steel Slabs
… employed method to reduce nozzle clogging in the continuous casting process. It also affects casting operation and product quality by changing the flow pattern in the nozzle and mold. The current work combines mathematical modeling and experiments to investigate the argon bubble behavior in …
-
Studies of turbulent flows in continuous casting of steel with and without magnetic field
… as well as in the nozzle and mold geometries of the continuous casting process. The direct numerical simulations are first performed in channel, square and 2:1 aspect rectangular ducts to investigate the effect of magnetic field on turbulent flows. The rectangular duct is a more practical …
-
Modeling Interfacial Slag Layer Phenomena in the Shell /Mold Gap in Continuous Casting of Steel
… to interpret the crystallization behavior of slag. A mechanism for the formation of this crystalline layer was proposed that combined the effects of a shift in the viscosity curve, a decrease in the liquid slag conductivity due to partial crystallization, and an increase in the solid slag …
-
High fidelity numerical investigations of tailored magnetic fields for defect reduction in continuous casting of steel
In the Continuous Casting (CC) process, defects are created when the inclusions are entrained deep into the strand and are entrapped in the solidifying shell. Both the creation and entrapment of inclusions are a function of transient fluid flow behavior in the mold along with the inclusion …
-
User-friendly interface design and development for continuous-casting model CON1D
… run simulations, and graph the outputs from the continuous casting model CON1D was designed and implemented in a spreadsheet environment, with a focus on including features to expand the usability and audience of the model. CON1D is a very powerful and efficient 1-D transient computational model …
-
Investigation of meniscus region behavior and oscillation mark formation in steel continuous casting using a transient thermo-fluid model
In the continuous casting of steel, many complex phenomena in the meniscus region of the mold are responsible for the formation of oscillation marks. Oscillation marks are depressions found around the perimeter of continuously cast steel slabs, which if too large can lead to cracking in steel …
-
Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations
Continuous casting produces over 95% of steel in the world today, hence even small improvements to this important industrial process can have large economic impact. In the continuous casting of steel process, argon gas is usually injected at the slide gate or stopper rod to prevent clogging, but …
-
Analysis of the nail board experiment to measure the liquid slag depth in steel continuous casting
… inexpensive technique used to measure the molten steel surface velocity and profile of the molten steel surface in the continuous casting of steel. Aluminum wires are often added to measure the liquid slag layer depth as well. This work investigates the accuracy of the nail board test used for …
-
Multiphase particle-size-grouping model of precipitation and its application to thermal processing of microalloyed steel
The formation and presence of second phase precipitates greatly influence the properties of metal alloys, and varies with alloy composition and temperature history. In microalloyed steel, for example, precipitates may lead to beneficial grain refinement or detrimental transverse surface cracks. A …
-
Grade effects on thermal-mechanical behavior during the initial solidification of steel
… takes initial steps towards the ultimate goal of fundamental understanding of how cracks and depressions form during continuous casting of steel, and demonstrates a tool towards troubleshooting and preventing them. Mathematical models are developed and applied to examine thermal and mechanical …
-
Multiphysics modeling of the steel continuous casting process
… work develops a macroscale, multiphysics model of the continuous casting of steel. The complete model accounts for the turbulent flow and nonuniform distribution of superheat in the molten steel, the elastic-viscoplastic thermal shrinkage of the solidifying shell, the heat transfer through the …
-
Modeling transient multiphase flow and mold top surface behavior in steel continuous casting
… thesis develops, validates and applies a system of computational models to investigate transient multiphase turbulent flow physics in the mold region and mold top surface behavior during continuous casting of steel slabs. Each model can be used independently or combined together as a …
-
Control of constrained moving-boundary process with application to steel continuous casting
Continuous casting is an important engineering process producing nearly all steel currently used worldwide. Regulation of the steel temperature through the water spraying during casting critically affects the final product quality as well as operational safety. Most of the cooling spray control …
-
Rejection of periodic disturbances in uncertain nonlinearly perturbed stable infinite dimensional systems
… problem in the mold oscillation system of a continuous caster is addressed. The mold oscillation system consists of a subsystem of beams hinged at the center supporting the mold at one end and excited by an electro-hydraulic actuator at the other end. The actuator piston is attached to …