Hydrodynamic characteristics of magnetically fluidized beds consisting of a mixture of magnetic and nonmagnetic materials

The velocity of the beginning of fluidization and the porosity of a bed were investigated for a mixture of cast-iron (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$(\bar d_p = 1.086 mm)$$ \end{document}p = 1.086 mm) and copper (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$(\bar d_p = 1.086 mm)$$ \end{document}p = 1.086 mm) particles fluidized in a homogeneous external magnetic field of an intensity of up to 5662 A/m. By analyzing the forces that act on the magnetic particles the authors obtained an expression for calculating Umb in a bed consisting of a mixture of magnetic and nonmagnetic particles. The calculation results are compared with the experimental data.