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1 – 10 of 43Wladimir Ebel, Alexander Nikanorov and Egbert Baake
The purpose of this paper is to research a multi-zone rubber vulcanization process heated by induction.
Abstract
Purpose
The purpose of this paper is to research a multi-zone rubber vulcanization process heated by induction.
Design/methodology/approach
The design is an abstract setup model with two zones, where the homogene rubber compound is heated with different regimes. Simulation is completely done in ANSYS Mechanical by the finite element method solution. The research is made mostly simulative.
Findings
The results show that it is possible to obtain a factor-three vulcanization level difference in a core of a 20-mm rubber plate in a distance of less than 60 mm, while the heating is done from the side of the surface.
Originality/value
The originality is the combination of rubber vulcanization with a dynamic heat source in a form of electromagnetic induction applied on the mold form. This allows a high level of control of the vulcanization process of the rubber compound.
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Keywords
Andrejs Tatulcenkovs, Andris Jakovics, Egbert Baake and Bernard Nacke
The purpose of this paper is to the study the multiphase bubbles flow motion in a vertical channel with an electroconducting liquid without and under the influence of a magnetic…
Abstract
Purpose
The purpose of this paper is to the study the multiphase bubbles flow motion in a vertical channel with an electroconducting liquid without and under the influence of a magnetic field.
Design/methodology/approach
For numerical calculations, the lattice Boltzmann method (LBM) is used, which is based on the kinetic theory for solving fluid mechanics and other physical problems. The phase-field lattice Boltzmann model is developed to simulate the behaviour of multiphase bubble–bubble interaction while rising in the fluid with high density ratios.
Findings
The behaviour of the rising bubble flow in a rectangular column of two phases is investigated with the two-dimensional LBM.
Originality/value
The multiphase flow in electroconducting liquids with high ratio of density is studied using the LBM.
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Keywords
Martin Schulze and Egbert Baake
This paper aims to deal with different induction and conduction heating approaches to realize a tailored heating of round billets for hot forming processes. In particular, this…
Abstract
Purpose
This paper aims to deal with different induction and conduction heating approaches to realize a tailored heating of round billets for hot forming processes. In particular, this work examines the limits in which tailor-made temperature profiles can be achieved in the billet. In this way, a flow stress distribution based on the temperature field in the material can be set in a targeted manner, which is decisive for forming processes.
Design/methodology/approach
For the heating of round billets by induction, the rotationally symmetric arrangement is used and a parameterized 2D finite element method model is created. The harmonic electromagnetic solution is coupled with the transient thermal solution. For heating by means of conduction, the same procedure is used only with the use of a 3D model.
Findings
First results have shown that both methods can achieve very good results for billets with small diameters (d < 30 mm). For larger diameters, an adapted control of the heating process is necessary to ensure through heating of the material. Further investigations are carried out.
Practical implications
Using tailored heating for forging billets, several forming steps can be achieved in one step. Among other things, higher energy efficiency and throughput rates can be achieved.
Originality/value
The peculiarity of the tailored heating approach is that, in contrast to inhomogeneous heating, where only partial areas are heated, the entire component is heated to the target.
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E. Baake, A. Jakovics, S. Pavlovs and M. Kirpo
The purpose of this paper is to present in‐depth numerical modelling of heat and mass exchange in industrial induction channel furnace (ICF).
Abstract
Purpose
The purpose of this paper is to present in‐depth numerical modelling of heat and mass exchange in industrial induction channel furnace (ICF).
Design/methodology/approach
The turbulent heat and mass exchange in the melt is calculated using a three‐dimensional (3D) electromagnetic model and a 3D transient large eddy simulation method. The simulation model has been verified by flow velocity and temperature measurements, which were carried out using an industrial sized channel inductor operating with Wood's metal as a low temperature model melt.
Findings
The ICF is well‐established for melting, holding and casting in the metallurgical industry. But there are still open questions regarding the heat and mass exchange in the inductor channel itself and between the channel and the melt bath. Different new designed channel geometries have been investigated numerically in order to find an optimized shape of the channel, which leads to an improved heat and mass transfer.
Originality/value
Long‐term computations for the industrial ICF have been performed. Low frequency oscillations of the temperature maximum and its position in the ICF channel are considered.
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M. Kirpo, A. Jakovičs, B. Nacke and E. Baake
Aims to present recent activities in numerical modeling of turbulent transport processes in induction crucible furnace.
Abstract
Purpose
Aims to present recent activities in numerical modeling of turbulent transport processes in induction crucible furnace.
Design/methodology/approach
3D large eddy simulation (LES) method was applied for fluid flow modeling in a cylindrical container and transport of 30,000 particles was investigated with Lagrangian approach.
Findings
Particle accumulation near the side crucible boundary is determined mainly by the ρp/ρ ratio and according to the presented results. Particle settling velocity is of the same order as characteristic melt flow velocity. Particle concentration homogenization time depends on the internal flow regime. Separate particle tracks introduce very intensive mass exchange between the different parts of the melt in the whole volume of the crucible.
Originality/value
Transient simulation of particle transport together with LES fluid flow simulation gives the opportunity of accurate prediction of admixture concentartion distribution in the melt.
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Keywords
A. Umbrasko, E. Baake, B. Nacke and A. Jakovics
Aims to present recent activities in numerical modeling of cold crucible melting process.
Abstract
Purpose
Aims to present recent activities in numerical modeling of cold crucible melting process.
Design/methodology/approach
3D numerical analysis was used for electromagnetic problem and 3D large eddy simulation (LES) method was applied for fluid flow modeling.
Findings
The comparative modeling shows, that higher H/D ratio of the melt is more efficient when total power consumption is considered, but this advantage is held back by higher heat losses through the crucible walls. Also, calculations reveal that lower frequencies, which are energetically less effective, provide better mixing of the melt.
Originality/value
3D electromagnetic model, which allows to take into account non‐symmetrical distribution of Joule heat sources, together with transient LES fluid flow simulation gives the opportunity of accurate prediction of temperature distribution in the melt.
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P. Turewicz, E. Baake and A. Umbrashko
The purpose of this paper is to describe how electromagnetic stirring during continuous casting of ferrous and non‐ferrous metals is applied in order to increase the homogeneity…
Abstract
Purpose
The purpose of this paper is to describe how electromagnetic stirring during continuous casting of ferrous and non‐ferrous metals is applied in order to increase the homogeneity and the material properties by improving the grain refinement in the solidification process. The fluid flow and thermal modeling was performed for studying the metal wire pulling process, where melt is being stirred at the solidification front (SF) by electromagnetic forces. Transient simulation has been carried out in order to investigate the periodical character of the process.
Design/methodology/approach
The numerical analysis was performed in 2D utilizing the rotational symmetry of the problem. First the electromagnetic fields were estimated using FEM and were subsequently exported as source terms in a coupled thermal and flow simulation with FVM.
Findings
The presented numerical model estimated the most suitable position between the stirring coil and the SF to achieve high flow velocities which improve the grain refinement process.
Originality/value
This work enables estimation of the melt solidification in an electromagnetic stirred continuous casting process with oscillating pull velocities.
Details
Keywords
To provide a selective bibliography for researchers and graduate students who have an interest in induction processes applied to the electromagnetic processing of materials.
Abstract
Purpose
To provide a selective bibliography for researchers and graduate students who have an interest in induction processes applied to the electromagnetic processing of materials.
Design/methodology/approach
The objective is to provide references that identify seminal, early work, and references that represent the current state of the art. References are listed in categories that cover the broad range of induction modeling and application issues.
Findings
A brief overview of the key areas in induction processing of materials is provided, but greater emphasis and space is devoted to the references provided.
Research limitations/implications
The middle years of each topic area are not covered.
Practical implications
A very comprehensive coverage of material is provided to those with an interest in induction processing of materials.
Originality/value
This paper fulfils an identified information/resources need.
Details