Inverse analysis of continuous casting processes

Nowak, Iwona; Nowak, Andrzej J.; Wrobel, L.C.

doi:10.1108/09615530310482445

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…Therefore for finding the unique solution of such task some additional information is required, for example the measurements of temperature in selected points of the region. Thus, procedure of solving the inverse problem consists in designation of the causes determining this process on the basis of their known consequences [1,2,3]. It is also worth to mention that the inverse problems are the, so called, ill posed problems because usually their analytic solutions do not exist or they exist but are neither unique nor stable [1].…”

Section: Prefacementioning

confidence: 99%

Determination of the Heat Flux in the Process of Solidiﬁcation by Applying the Ant Colony Optimization Algorithm

Hetmaniok

Słota

2014

KEM

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The paper presents an application of Ant Colony Optimization algorithm as a partof procedure for solving the inverse solidiﬁcation problem. Investigated task consists in recon-struction of the boundary condition (heat ﬂux) on the basis of temperature measurements inselected points of the cast. First step of the method is based on the ﬁnite diﬀerence method withapplication of the generalized alternating phase truncation method and serves for solving theappropriate direct solidiﬁcation problem. In the second step some functional representing thecrucial part of the procedure is minimized with the aid of Ant Colony Optimization algorithm.

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Section: Prefacementioning

confidence: 99%

Determination of the Heat Flux in the Process of Solidiﬁcation by Applying the Ant Colony Optimization Algorithm

Hetmaniok

Słota

2014

KEM

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“…In [51] an application of optimal control for the inverse design Stefan problem concerning temperature selection on the boundary was considered. Nowak and co-authors [33,34,52,53] formulated the problem of determination of the interface location as a geometric inverse problem. In these articles, for determination of the interface location and the field of temperature, there are used values of temperature known from measurements taken at selected points of the considered domain.…”

Section: Introductionmentioning

confidence: 99%

Determination of Optimal Parameters for the Immune Algorithm Used for Solving Inverse Heat Conduction Problems with and without a Phase Change

Hetmaniok

Nowak

Słota

et al. 2012

Numerical Heat Transfer, Part B: Fundamentals

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In this article the inverse heat conduction problem and the inverse Stefan problem with the third kind of boundary condition are solved by applying the immune algorithm. This method has been introduced in recent years and belongs to the group of optimization algorithms inspired by natural processes. In this case the applied algorithm is based on the rules of immune system functioning in vertebrate bodies. It is used for minimizing a functional playing a crucial role in the solution of the problem posed. The algorithm considered is investigated with respect to the parameters which should be chosen in order to provide the most efficient algorithm performance.

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“…The meniscus is covered by mold flux powder that has a lower density than steel. Mold flux has a significant role in an unsullied and smooth running of the process (Nowak et al, 2003). The main role of the mold flux powder is to avoid excessive heat removal and re-oxidation of molten steel from meniscus surface, to absorb impurities and non-metallic inclusions and provide lubrication between the solidifying shell and mold wall (Bielnicki et al, 2015;Mcdavid and Thomas, 1996;Yoon et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Two-phase analysis of interface level fluctuation in continuous casting mold with electromagnetic stirring

Maurya

Jha

2018

HFF

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Purpose This investigation aims to analyze the steel-flux interface level fluctuation because of electromagnetic stirring and its process parameters in a continuous casting billet mold. Design/methodology/approach An un-coupled numerical model for electromagnetic field generation and a coupled numerical model of electromagnetic field and two-phase fluid flow have been developed. The two-phase fluid flow has been modeled using volume of fluid method, in which externally generated time-varying electromagnetic field is coupled and analyzed using magnetohydrodynamic method. Top surface standing wave stability criteria are used to study the criticality of interface stability. Findings Results show that application electromagnetic field for stirring increases the interface level fluctuation, specifically at the mold corners and near the submerged entry nozzle. The increase in current intensity and stirrer width barely affect the interface level. However, interface level fluctuation increases considerably with increase in frequency. Using stability criteria, it is found that at 20 Hz frequency, the ratio of height to wavelength of interface wave increases much above the critical value. The iso-surface of the interface level shows that at 20 Hz frequency, mold flux gets entrapped into the liquid steel. Practical implications The model may be used during optimization of in-mold electromagnetic stirrer to avoid mold flux entrapment and control the cast quality. Originality/value The study of mold level fluctuation in the presence of in-mold electromagnetic stirrer has rarely been reported. The criticality of stirrer process parameters on level fluctuation has not been yet reported. This study lacks in experimental validation; however, the findings will be much useful for the steelmakers to reduce the casting defects.

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Inverse analysis of continuous casting processes

Cited by 9 publications

References 9 publications

Determination of the Heat Flux in the Process of Solidiﬁcation by Applying the Ant Colony Optimization Algorithm

Determination of the Heat Flux in the Process of Solidiﬁcation by Applying the Ant Colony Optimization Algorithm

Determination of Optimal Parameters for the Immune Algorithm Used for Solving Inverse Heat Conduction Problems with and without a Phase Change

Two-phase analysis of interface level fluctuation in continuous casting mold with electromagnetic stirring

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