Some aspects of liquid‐solid fluidized beds

Hydrodynamic characteristics of randomly packed fluidized beds were investigated using particles of different sizes and densities fluidized with water. The minimum fluidization velocity was found to be independent of the initial bed height. The minimum fluidization velocity was found to be\documentclass{article}\pagestyle{empty}\begin{document}$$ G_{mfp} = 3.63 \times 10^{ - 4} \left[ {\frac{{d_p^2 \rho _f \left({\rho _s - \rho _f } \right)g}}{\mu }} \right]^{0.915} $$\end{document}Bed expansion followed the Richardson Zaki relationship and the exponent ' n ' has been correlated as:\documentclass{article}\pagestyle{empty}\begin{document}$$ n = 0.116\left({\frac{{d_p }}{{D_p }}} \right)^{ - 0.763} \left({{\mathop{\rm Re}\nolimits} _f } \right)^{0.22} $$\end{document}