Influence of velocity profile on calibration function of Lorentz force flowmeter

作     者：C.STELIAN 于洋 李本文 A.THESS C STELIAN;Yang YU;Ben-wen LI;A THESS

作者机构：Institute of Thermodynamics and Fluid MechanicsIlmenau University of TechnologyIlmenau 98684Germany Department of PhysicsWest University of TimisoaraTimisoara 300233Romania Key Laboratory of Electromagnetic Processing of MaterialsNortheastern University Institute of Engineering ThermodynamicsGerman Aerospace CenterStuttgart 70569Germany 

出 版 物：《Applied Mathematics and Mechanics(English Edition)》 (应用数学和力学（英文版）)

年 卷 期：2014年第35卷第8期

页      面：993-1004页

核心收录：

学科分类：08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by the German Research Foundation(Deutsche Forschungsgemeinschaft) 

主　　题：laminar flow numerical simulation electromagnetic velocimetry 

摘      要：A Lorentz force flowmeter is a noncontact electromagnetic flow-measuring device based on exposing a flowing electrically conducting liquid to a magnetic field and measuring the force acting on the magnet system. The measured Lorentz force is proportional to the flow rate via a calibration coefficient which depends on the velocity distribution and magnetic field in liquid. In this paper, the influence of different velocity profiles on the calibration coefficient is investigated by using numerical simulations. The Lorentz forces are computed for laminar flows in closed and open rectangular channels, and the results are compared with the simplified case of a solid conductor moving at a constant velocity. The numerical computations demonstrate that calibration coefficients for solid bodies are always higher than for liquid metals. Moreover, it can be found that for some parameters the solid-body calibration coefficient is almost twice as high as for a liquid metal. These differences are explained by analyzing the patterns of the induced eddy currents and the spatial distributions of the Lorentz force density. The result provides a first step for evaluating the influence of the laminar velocity profiles on the calibration function of a Lorentz force flowmeter.