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Numerical Modeling of Turbulent Melt Flow in a Continuous Casting Mold Affected by an Electromagnetic Brake

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Journal of Iron and Steel Research International 2012年第S2期19卷 845-848页

作者： MIAO Xin-cheng Timmel Klaus Lucas Dirk REN Zhong-ming Eckert Sven Gerbeth Gunter mhd department Helmholtz-Zentrum Dresden-Rossendorf(HZDR) Key Laboratory of Metallurgy & Materials Processing Shanghai University

The current work combines numerical and experimental investigations based on a small-scale mockup using the eutectic alloy *** jet flow discharging from the submerged entry nozzle was exposed perpendicularly to a DC magnetic field across the entire wide face of the *** calculations were performed by using the commercial package CFX with an implemented RANS-SST turbulence *** anisotropic properties of the mhd turbulence were taken into account by specific modifications of the turbulence *** comparison between our numerical calculations and the experimental results shows a very well *** particular,the modified RANS-SST turbulence model is capable to reconstruct the peculiar phenomenon of the excitation of non-steady,non-isotropic large-scale flow perturbations caused by the application of the DC magnetic *** important finding of our study is the feature that the electrical boundary conditions,namely the wall conductivity ratio,have a great impact on the mold flow subjected to an external magnetic field.

关键词： continuous casting electromagnetic brake RANS-SST turbulence model mhd turbulence

Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 193-208页

作者： K.MUHAMMAD M.SARFRAZ department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology department of Mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(mhd) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in MATHEMATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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Turbulent Melt Flow in a Helical Channel of an Inductive Pump

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Journal of Iron and Steel Research International 2012年第S1期19卷 566-568页

作者： A.Kapusta B.Mikhailovich L.Reymal B.Tilman Center for mhd Studies Ben-Gurion University of the NegevBeer-ShevaIsrael department of Mechanical Engineering Ben-Gurion University of the NegevBeer-ShevaIsrael Mahyd and Co TallinnEstonia

In contrast to Ref.[1]studying mhd processes in a helical channel induced by a vertical rotating electric current layer,in the present report we examine another version with the rotating electric current layer orthogonal to the helical channel axis,which leads to an increase in melt velocity with the growing pitch angle α of the helical channel.

关键词： vertical coordinate system helical channel pitch angle external friction model electromagnetic body force flow velocity.

Turbulent Melt Flow Excited by Amplitude-andFrequency Modulated RMF

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Journal of Iron and Steel Research International 2012年第S1期19卷 483-486页

作者： A.Kapusta M.Khavkin Sh.Lesin B.Mikhailovich B.Tilman Center for mhd Studies Ben-Gurion University of the NegevBeer-ShevaIsrael department of Mechanical Engineering Ben-Gurion University of the NegevBeer-ShevaIsrael Energetics Technologies Ltd OmerIsrael

We examine mhd processes arising in melts placed in vessels of circular and rectangular cross-sections under the action of amplitude-and-frequency modulated rotating magnetic *** is established that besides the mean t... 详细信息

关键词： rotating magnetic field amplitude-and-frequency modulation electromagnetic body force velocity field velocity oscillation external friction model

Liquid Metal Modelling of Continuous Steel Casting

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Liquid Metal Modelling of Continuous Steel Casting

Numerical Modeling of Turbulent Melt Flow in a Continuous Casting Mold Affected by an Electromagnetic Brake

第十届中国钢铁年会暨第六届宝钢学术年会

作者： Gerbeth Gunter Wondrak Thomas Stefani Frank Shevchenko Natalia Eckert Sven Timmel Klaus Helmholtz-Zentrum Dresden-Rossendorf Institute of Fluid Dynamics MHD Department

Model experiments with low melting point liquid metals are an important tool to investigate the flow structure and related transport processes in melt flows relevant for metallurgical applications. We present recent results from the three LIMMCAST facilities working either with room-temperature alloy Ga In Sn or with the alloy Sn Bi at temperatures of 20050°C. The main value of cold metal laboratory experiments consists in the capabilities to obtain quantitative flow measurements with a reasonable spatial and temporal resolution, which is essential for code validation. Experimental results are presented covering the following phenomena: contactless electromagnetic tomography of the flow in the mold, flow monitoring by ultrasonic sensors, mold flow under the influence of an electromagnetic brake, injection of argon bubbles through the stopper rod, X-ray visualization of gas bubble two-phase flow in the nozzle and in the mold.

关键词： continuous casting physical modeling flow measurements magnetic field flow control electromagnetic brake

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Numerical Modeling of Turbulent Melt Flow in a Continuous Ca...

Patients with functional bowel disorder have disaccharidase deficiency:A single-center study from Russia

第七届冶金与材料电磁过程国际会议（EPM2012）

关键词： continuous casting electromagnetic brake RANS-SST turbulence model mhd turbulence

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World Journal of Clinical Cases 2021年第17期9卷 4178-4187页

作者： Saria Dbar Olga Akhmadullina Elena Sabelnikova Nikolai Belostotskiy Asfold Parfenov Svetlana Bykova Sergey Bakharev Elena Baulo Alexandra Babanova Lilia Indeykina Tatyana Kuzmina Tatiana Kosacheva Aleksey Spasenov Alina Makarova Non-inflammatory Bowel Diseases Moscow Health DepartmentMoscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia Moscow Health department Moscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia Pre-Clinical Research Laboratory Moscow Clinical Scientific Center Named after A.S.Loginov MHDMoscow 111123Russia department of Bowel Pathology Moscow Health DepartmentMoscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia Laboratory of Functional Diagnostics of Intestinal Diseases Moscow Health DepartmentMoscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia Nutraceuticals Laboratory Moscow Health DepartmentMoscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia department of Medical Statistics Moscow Health DepartmentMoscow Clinical Scientific Center n.a.A.S.LoginovMoscow 111123Russia

BACKGROUND Functional bowel disorder(FBD)may be caused by a decrease in disaccharidase ***,the timely diagnosis of disaccharidase deficiency could lead to a better prognosis in patients with this *** To determine the potential value of intestinal disaccharidases glucoamylase,maltase,sucrase,and lactase in understanding the etiology and pathogenesis of *** A total of 82 FBD patients were *** to the Rome IV criteria(2016),23 patients had diarrhea-predominant irritable bowel syndrome(IBS),33 had functional diarrhea,10 had constipation-predominant IBS,4 had functional constipation,and 12 had mixed *** Dahlqvist method was used to measure disaccharidase activity in the brush-border membrane of mature enterocytes of the small intestine,in duodenal biopsies obtained during *** Lactase deficiency was detected in 86.5%of patients,maltase deficiency in 48.7%,sucrase deficiency in 50%,and glucoamylase deficiency in 84.1%.The activities of all enzymes were reduced in 31.7%of patients,and carbohydrase deficiency was detected in 63.5%of *** low activity of enzymes involved in membrane digestion in the small intestine was found in 95.2%of *** In 78 of the 82 patients with FBD,gastrointestinal symptoms were associated with disaccharidase deficiency.

关键词： Functional bowel disorder Irritable bowel syndrome Disaccharidase deficiency Maltase deficiency Sucrase deficiency Lactase deficiency

3D Casson nanofluid flow over slendering surface in a suspension of gyrotactic microorganisms with Cattaneo-Christov heat flux

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Applied Mathematics and Mechanics(English Edition) 2018年第5期39卷 623-638页

作者： V.NAGENDRAMMA C.S.K.RAJU B.MALLIKARJUNA S.A.SHEHZAD A.LEELARATHNAM department of Mathematics SPMVV University department of Mathematics GITAM University department of Mathematics BMS College of Engineering department of Mathematics COMSATS Institute of Information Technology

A mathematical model is proposed to execute the features of the non-uniform heat source or sink in the chemically reacting magnetohydrodynamic （mhd） Casson fluid across a slendering sheet in the presence of microorganisms and Cattaneo-Christov heat flux. Multiple slips （diffusion, thermal, and momentum slips） are applied in the modeling of the heat and mass transport processes. The Runge-Kutta based shooting method is used to find the solutions. Numerical simulation is carried out for various values of the physical constraints when the Casson index parameter is positive, negative, or infinite with the aid of plots. The coefficients of the skin factors, the local Nusselt number, and the Sherwood number are estimated for different parameters, and discussed for engineering interest. It is found that the gyrotactic microorganisms are greatly encouraged when the dimensionless parameters increase, especially when the Casson fluid parameter is negative. It is worth mentioning that th~ velocity profiles when the Casson fluid parameter is positive are higher than those when the Casson fluid parameter is negative or infinite, whereas the temperature and concentration fields show exactly opposite phenomena.

关键词： microorganisms multiple slip Casson fluid Cattaneo-Christov heat flux,slendering sheet

Numerical computations of magnetohydrodynamic mixed convective flow of Casson nanofluid in an open-ended cavity formed by earthquake-induced faults

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Applied Mathematics and Mechanics(English Edition) 2024年第12期45卷 2215-2230页

作者： M.IBTESAM S.NADEEM J.ALZABUT department of Mathematics Quaid-i-Azam University department of Mathematics and Sciences Prince Sultan University department of Mathematics Wenzhou University department of Industrial Engineering OSTIM Technical University

The numerical computations for the magnetohydrodynamic（mhd） mixed convective flow of a non-Newtonian Casson nanofluid（Cu/H2O） within an open-ended cavity formed by earthquake-induced faults are analyzed, aiming to investigate the fluid dynamics and convection processes of geothermal systems. Such cavities, typically found in energy reservoirs, are primarily caused by tensional fault zones formed due to the accumulated energy from the disintegration of radioactive materials. These cavities play a crucial role in energy transmission, particularly in the form of heat. The focus of this paper is on the laminar, steady, and incompressible fluid flow. An inclined magnetic field is applied with an angle of inclination z = 30°. Additionally, a heated material with two vertical corrugated walls is placed at the center of the cavity. The governing nonlinear partial differential equations（PDEs） are transformed into the equations with a nondimensional form. The Galerkin finite element method（FEM） is implemented to solve the dimensionless equations. The impacts of key variables, including the Reynolds number Re, the volume fraction（0.01≤ φp≤0.05）, the Hartmann number Ha, and the Casson parameter（0.5≤γ≤1.0）, on the velocity and temperature distributions are studied. The analysis of the fluid flow and the heat transfer rate is conducted. The results indicate that the velocity increases as the volume fraction and the Reynolds number ***, the heat transfer rate rises with the Reynolds number and the volume fraction,while decreases with the higher Hartmann number. The Nusselt number increases with the volume fraction and the Reynolds number but decreases with the Hartmann number.

关键词： 74S05 76A05 Casson fluid finite element method (FEM) magnetohydrodynamic (mhd) mixed convection nanofluid O242.2 O373