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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical Modelling of Fluid Flow and Thermal Phenomena in the Tundish of CSC Machine
    Autorzy:
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/380813.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    foundry industry
    information technology
    continuous casting
    molten metal
    krzepnięcie
    przemysł odlewniczy
    odlewanie ciągłe
    metal płynny
    Opis:
    The mathematical and numerical simulation model of the liquid steel flow in a tundish is presented in this paper. The problem was treated as a complex and solved by the finite element method. The single-strand slab tundish is used to continuous casting slabs. The internal work space of the tundish was modified by the following flow control devices. The first device was a striker pad situated in the pouring tundish zone. The second device was a baffle with three holes and the third device was a baffle without hole. The main purpose of using these devices was to cause a quiet liquid mixing as well as give directional metal flow upwards which facilitated inclusion floatation. The interaction of flow control devices on hydrodynamic conditions was received from numerical simulation. As a result of the computations carried out, the liquid steel flow and steel temperature fields were obtained. The influence of the tundish modification on velocity fields in the liquid phase of steel was estimated, because these have an essential influence on high quality of a continuous steel cast slab.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of nozzle outlet angle on flow and temperature field in a slab continuous casting mould
    Wpływ kąta wypływu dyszy na pole prędkości i temperatury w krystalizatorze ciągłego odlewania wlewków płaskich
    Autorzy:
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/382373.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    continuous casting
    molten metal flow
    numerical simulation
    proces krzepnięcia
    odlewanie ciągłe
    metal ciekły
    symulacja numeryczna
    Opis:
    The mathematical and numerical simulation model of the growth of the solid metal phase within a continuous cast slab is presented in this paper. The problem was treated as a complex one. The velocity fields are obtained by solving the momentum equations and the continuity equation, whereas the thermal fields are calculated by solving the conduction equation with the convection term. One takes into consideration in the mathematical model the changes of thermophysical parameters depending on the temperature and the solid phase volume fractions in the mushy zone. The problem was solved by the finite element method. A numerical simulation of the cast slab solidification process was made for different cases of continuous casting mould pouring by molten metal. The effect of nozzle outlet angle on the velocity fields in liquid phase and the solid phase growth kinetics of the cast slab were investigated, because these magnitudes have essential an influence on high-quality of a continuous steel cast slab.
    W pracy przedstawiono model matematyczny i numeryczny narastania fazy stałej we wlewku ciągłego odlewania. Zadanie potraktowano kompleksowo. Pola prędkości otrzymano z rozwiązania równań pędu i równania ciągłości przepływu, natomiast pola temperatury z rozwiązania równania przewodnictwa z członem konwekcyjnym. Uwzględniono zmianę parametrów termofizycznych od temperatury i od udziału fazy stałej w dwufazowej strefie przejściowej. Problem rozwiązano metodą elementów skończonych. Analizie poddano krystalizator o przekroju prostokątnym. Symulacje numeryczne procesu krzepnięcia wlewka wykonano dla różnych wariantów doprowadzenia ciekłego metalu do krystalizatora (różne kąty wypływu strumienia ciekłego metalu z dyszy wylewu zanurzonego). Badano wpływ zalewania krystalizatora na pole prędkości w fazie ciekłej i kinetykę narastania fazy stałej wlewka ciągłego odlewania.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 199-202
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of stress fields generated by quenching process
    Analiza numeryczna pól naprężeń generowanych procesem hartowania
    Autorzy:
    Bokota, A.
    Domański, T.
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/382661.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quenching process
    stress field
    transformations plasticity
    numerical simulation
    tool steel
    proces hartowania
    pole naprężeń
    symulacja numeryczna
    stal narzędziowa
    Opis:
    In work the presented numerical models of tool steel hardening processes take into account mechanical phenomena generated by thermal phenomena and phase transformations. In the model of mechanical phenomena, apart from thermal, plastic and structural strain, also transformations plasticity was taken into account. The stress and strain fields are obtained using the solution of the Finite Elements Method of the equilibrium equation in rate form. The thermophysical constants occurring in constitutive relation depend on temperature and phase composite. For determination of plastic strain the Huber-Misses condition with isotropic strengthening was applied whereas for determination of transformation plasticity a modified Leblond model was used. In order to evaluate the quality and usefulness of the presented models a numerical analysis of stresses and strains associated hardening process of a fang lathe of cone shaped made of tool steel was carried out.
    W pracy przedstawiono model numeryczny procesu hartowania stali narzędziowej, w którym uwzględniono zjawiska mechaniczne generowane zjawiskami cieplnymi i przemianami fazowymi. W modelu zjawisk mechanicznych uwzględniono oprócz odkształceń termicznych, plastycznych i strukturalnych - również odkształcenia transformacyjne. Pola naprężeń i odkształceń uzyskuje się z rozwiązania metodą elementów skończonych równań równowagi w formie prędkościowej. Stałe termofizyczne występujące w związkach konstytutywnych uzależniono od temperatury i składu fazowego. Do wyznaczania odkształceń plastycznych wykorzystano warunek Hubera-Misesa ze wzmocnieniem izotropowym, natomiast do wyznaczania odkształceń transformacyjnych zastosowano zmodyfikowany model Leblonda. W celu oceny jakości i przydatności prezentowanego modelu dokonano analizy numerycznej pól temperatury, udziałów fazowych, naprężeń i odkształceń towarzyszących procesowi hartowania kła tokarki ze stali narzędziowej.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 13-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Riser Shape on Feeding Effectiveness of Solidifying Casting
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/383146.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    numerical simulation
    liquid metal flow
    proces krzepnięcia
    wady odlewów
    symulacja numeryczna
    przepływ ciekłego metalu
    Opis:
    The mathematical model and numerical simulations of the solidification of a cylindrical shaped casting, which take into account the process of filling the mould cavity by liquid metal and feeding the casting through the riser during its solidification, are presented in the paper. Mutual dependence of thermal and flow phenomena were taken into account because have an essential influence on solidification process. The effect of the riser shape on the effectiveness of feeding of the solidifying casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of riser shape was made, which is important for foundry practice. Numerical calculations of the solidification process of system consisting of the casting and the conical or cylindrical riser were carried out. The velocity fields have been obtained from the solution of momentum equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. Changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 91-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Metal Pouring Conditions on the Formation of Defects in the Casting
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/946863.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    castings defects
    solidification process
    numerical modelling
    molten metal flow
    wady odlewów
    proces krzepnięcia
    modelowanie numeryczne
    metal ciekły
    Opis:
    The mathematical model and numerical simulations of the solidification of a cylindrical casting, which take into account the process of the mould cavity filling by liquid metal and the feeding of the casting through the conical riser during its solidification, are proposed in the paper. The interdependence of thermal and flow phenomena were taken into account because they have an essential influence on solidification process. The effect of the pouring temperature and pouring velocity of the metal on the solidification kinetics of the casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of these parameters was tried, which is important for foundry practice. The velocity fields have been obtained from the solution of Navier-Stokes equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. In the solidification modelling the changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Temperature and Velocity Fields During Filling of Continuous Casting Mould
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379679.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    continuous casting
    numerical simulation
    molten metal flow
    krzepnięcie
    odlewanie
    symulacja numeryczna
    Opis:
    In this paper, the mathematical model and numerical simulations of the molten steel flow by the submerged entry nozzle and the filling process of the continuous casting mould cavity are presented. In the mathematical model, the temperature fields were obtained by solving the energy equation, while the velocity fields were calculated by solving the momentum equations and the continuity equation. These equations contain the turbulent viscosity which is found by solving two additional transport equations for the turbulent kinetic energy and its rate of dissipation. In the numerical simulations, coupling of the thermal and fluid flow phenomena by changes in the thermophysical parameters of alloy depending on the temperature has been taken into consideration. This problem (2D) was solved by using the finite element method. Numerical simulations of filling the continuous casting mould cavity were performed for two variants of liquid metal pouring. The effect of the cases of pouring the continuous casting mould on the velocity fields and the solid phase growth kinetics in the process of filling the continuous casting mould was evaluated as these magnitudes have an influence on the high quality of the continuous cast steel slab.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 115-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Model of Solidification Including Formation of Multiple Shrinkage Cavities
    Autorzy:
    Skrzypczak, T.
    Sowa, L.
    Węgrzyn-Skrzypczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379500.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    shrinkage cavity
    numerical simulation
    finite element method
    proces krzepnięcia
    wady odlewów
    ubytki skurczowe
    symulacja numeryczna
    metoda elementów skończonych
    Opis:
    Presented paper shows the mathematical and numerical approaches for modelling of binary alloy solidification solved by the Finite Element Method (FEM). The phenomenon of shrinkage cavities formation process is included in the numerical model. Multiple macroscopic cavities can be modelled within the single casting volume. Solid, liquid and gaseous phases with different material properties are taken into account during solidification process. Mathematical model uses the differential equation of heat diffusion. Modification of specific heat is used to describe the heat releasing during liquid-solid phase change. Numerical procedure of shrinkage cavities evolution is based on the recognition of non-connected liquid volumes and local shrinkage computation in the each of them. The recognition is done by the selection of sets of interconnected nodes containing liquid phase in the finite element mesh. Original computer program was developed to perform calculation process. Obtained results of temperature and shrinkage cavities distributions are presented and discussed in details.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 37-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of the Solidification Process Including Air Gap Formation
    Autorzy:
    Skrzypczak, T.
    Węgrzyn-Skrzypczak, E.
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/383120.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    computer simulation
    finite element method
    multimesh approach
    air gap
    proces krzepnięcia
    symulacja komputerowa
    metoda elementów skończonych
    podejście wielowymiarowe
    szczelina powietrzna
    Opis:
    The paper presents an approach of numerical modelling of alloy solidification in permanent mold and transient heat transport between the casting and the mold in two-dimensional space. The gap of time-dependent width called "air gap", filled with heat conducting gaseous medium is included in the model. The coefficient of thermal conductivity of the gas filling the space between the casting and the mold is small enough to introduce significant thermal resistance into the heat transport process. The mathematical model of heat transport is based on the partial differential equation of heat conduction written independently for the solidifying region and the mold. Appropriate solidification model based on the latent heat of solidification is also included in the mathematical description. These equations are supplemented by appropriate initial and boundary conditions. The formation process of air gap depends on the thermal deformations of the mold and the casting. The numerical model is based on the finite element method (FEM) with independent spatial discretization of interacting regions. It results in multi-mesh problem because the considered regions are disconnected.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 147-150
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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