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Journal of Iron and Steel Research International 2012年第S2期19卷 613-616页

作者： WEGFRASS Andre RESAGK Christian DIETHOLD Christian FRHLICH Thomas WERNER Michael HALBEDEL Bernd THESS Andre Institute of Thermodynamics and Fluid Mechanics Department of Mechanical EngineeringIlmenau University of Technology Institute of Process Measurement and Sensor Technology Department of Mechanical EngineeringIlmenau University of Technology Institute of Inorganic-nonmetallic Materials Department of Mechanical EngineeringIlmenau University of Technology

The paper demonstrated the feasibility of lorentz force velocimetry for flow rate measurements of weakly conducting electrolytes using experimental results on salt water flow exposed to a permanent magnet *** innovative flow measurement technique allows the non-contact determination of flow rates and relies on the interaction between a magnetic field and a moving conducting *** an electrically conducting fluid moves through the magnetic field a lorentz force is generated and acts on the measurement *** present report provides an overview about the experimental setups and the first measurement results.

关键词： lorentz force velocimetry flow measurement electrolytes non-contact measurement

Flowrate Measurement in Turbulent Liquid Metal Channel Flow Using Time-of-Flight lorentz force velocimetry:Experimental Investigations and Numerical Modeling

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Journal of Iron and Steel Research International 2012年第S1期19卷 582-585页

作者： JIAN Dan-dan KARCHER Christian Ilmenau University of Technology Institute of Thermodynamics and Fluid MechanicsIlmenau D-98684Germany

lorentz force velocimetry(LFV)is a suitable non-contact technique to measure flow velocity and flowrates in electrically conducting high-temperature *** is based on the principles of magnetohydrodynamics:when an electrically conducting fluid passes the field lines produced by a magnet system,eddy currents are induced within the *** interactions of the eddy currents with the magnetic field generate lorentz *** LFV the counterforce acting on the magnet system is *** a flowmeter consists of a permanent magnet system and an attached digital force *** force recorded by the flowmeter is proportional to the flowrate Q and depends on both the electrical conductivity σ of the fluid and the spatial distribution of the applied magnet field ***,in metallurgical applications,σ is often unknown or fluctuates in time as it strongly depends on both temperature and composition of the *** the present paper we investigate a technique called Time-of-Flight lorentz force velocimetry ToF *** this technique,the flowrate can be determined by just cross-correlating the two force signals recorded by two flowmeters which are arranged one behind the other separated by a certain distance *** the passage of the triggered vortices, this ToF LFV measures the transit time τ of these *** we recalculate the velocity V according to the relation V = D/τ.We experimentally and numerically study turbulent liquid metal flow in the test facility EFCO(electromagnetic flow control channel)using the eutectic alloy GainSn as a test *** experiments show that this electromagnetic ToF LFV is well suited to determine the flow velocity and *** experiments are accompanied by numerical simulations using the commercial program package FLUENT.

关键词： lorentz force velocimetry electromagnetic flowrate measurement magnetohydrodynamic

Investigation of lorentz force velocimetry Using Electromagnets

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Journal of Iron and Steel Research International 2012年第S1期19卷 106-109页

作者： SANTARA Fatoumata Bintou KARCHER Christian THESS Andre Institute of Thermodynamics and Fluid Mechanics Ilmenau University of TechnologyIlmenau 100565 98684Germany

The present work is an analysis on the ElectroMagnetic lorentz force velocimetry(EM-LFV).This noncontact flow measurement technique is based on evaluating the lorentz force generated by the interactions of an electrically conducting fluid with a localized magnetic field that is produced by *** and numerical calculations were carried out as a continuation of a previous work published by Thess et *** objective is to establish the behavior of the lorentz force as a function of the main geometric parameters considered in the studied geometry. Thus we present here the evolution of the lorentz force induced in a translating cylindrical solid body and the coefficient of sensitivity of the flowmeter thanks to numerical simulations in respect with the main geometrical parameters of the problem.

关键词： computational magneto-hydrodynamics lorentz force velocimetry electromagnet

Development of a Non-Contact Electromagnetic Surface Velocity Sensor for Molten Metal Flow

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Journal of Iron and Steel Research International 2012年第S1期19卷 509-513页

作者： JIAN Dan-dan KARCHER Christian XU Xiu-jie DENG An-yuan WANG En-gang THESS André Ilmenau University of Technology Institute of Thermodynamics and Fluid MechanicsIlmenau 100565Germany Key Laboratories on EPM Ministry of ScienceNortheastern University

During continuous casting of steel,knowledge of both direction and magnitude of the velocity at the mold surface is of special ***,the surface is covered by a non-transparent layer of mold powder to prevent formation of ***,this meniscus flow cannot be registered by optical measurement ***-contact measurement methods are of *** of such non-invasive techniques is lorentz force veloeimetry(LFV).It is based on measuring the electromagnetically induced force acting on a magnet *** this paper we present a series of experiments that aim to demonstrate the feasibility of using two identical velocimeters,termed Time-of-Flight LFV(ToF LFV).Using ToF LFV the free-surface velocity may be purely determined by cross-correlating the two force signals delivered by the two force *** have developed a special prototype of such a measuring device termed meniscus velocity sensor(MVS).It has been designed to record local surface velocities in high-temperature metal *** Ilmenau University of Technology,the method has been successfully tested using both solid body movement and Ga^(68%)In^(20%)Sn^(12%)as a low-melting model *** the present paper we apply this technique to the case of high-temperature metal *** more detail,we present test measurements under industry-relevant conditions using both Sn^(32%)pb^(52%)Bi at 210℃ and molten steel at about 1700℃.These experiments were conducted at Key Laboratories on EPM at North Eastern *** evaluation of the data shows that our prototype of MVS works well in producing reproducible signals of which surface velocity can be determined.

关键词： free-surface liquid melt flow lorentz force velocimetry magnetohydrodynamics

Assembling and Test of a Halbach Array Magnet System for lorentz Forece velocimetry in Electrolytes

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Journal of Iron and Steel Research International 2012年第S1期19卷 145-148页

作者： Werner Michael Halbedel Bernd Department of Inorganic-Nonmetallic Materials University of Technology IlmenauIlmenau 100565 98684Germany

The paper presents a Halbach array magnet system(HAMS)for the application within a very first lorentz force velocimetry(LFV)experiment for electrolytic *** the design,assembling procedure and characterization method are presented under consideration of the strict limited weight of the *** increase the lorentz force outcome by a factor of three compared to the currently used simple magnet *** the fluid profile influence on a LFV measurement on electrolytes is investigated numerically-directly on the planned test setup-and presented for the first *** the lorentz forces,generated by the HAMS,decreases by 8%comparing an ideal plug-like profile at the inlet with a semi-parabolic profile arising near the outlet of the experiment.

关键词： lorentz force velocimetry Halbach magnet array magnet assemblies magnet system design