Using Lorentz forces to control the distribution of bubbles in a vertical tube filled with liquid metal

Final LIMTECH Colloquium and International Symposium on Liquid Metal Technologies

材料科学;金属学

Heitkam, S.^1 ; Tschisgale, S.^2 ; Krull, B.^2 ; Wetzel, T.^3 ; Baake, E.^4 ; Fröhlich, J.^2

Technische Universitat Dresden, Institut für Verfahrenstechnik und Umwelttechnik, Dresden

D-01062, Germany^1

Technische Universitat Dresden, Institut für Strömungsmechanik, Dresden

D-01062, Germany^2

Institute of Thermal Process Engineering, Karlsruhe Institute of Technology, Kaiserstr. 12, Karlsruhe

D-76131, Germany^3

Institute of Electrotechnology, Leibniz University of Hanover, Wilhelm-Busch-Str. 4, Hannover

D-30167, Germany^4

关键词: Convection patterns;    Cylindrical shapes;    Force distributions;    Homogeneous electric field;    Horizontal magnetic fields;    Mutual interaction;    Residence time;    Vertical tube;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/228/1/012008/pdf
DOI  :  10.1088/1757-899X/228/1/012008

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work, a method to increase the residence time of bubbles in tubes or pipes filled with liquid metal is investigated. Imposing a horizontal electric current and a perpendicular horizontal magnetic field generates an upward-directed Lorentz force. This force can counteract gravity and cause floating of bubbles. Even with homogeneous electric fields these float in the mean but fluctuate randomly within the swarm due to mutual interactions. In the present case the cylindrical shape of the container furthermore creates inhomogeneous electric currents and an inhomogeneous force distribution resulting in a macroscopic convection pattern stirring the bubbles and further homogenising the spatial distribution of the bubbles.