Modeling of solid-gas flow fields via a correlation study

A correlation study for modeling of solid-gas flow fields is presented with an emphasis to the extents of single phase gas flew through stationary vertical packed beds of solid particles and dilute phase flow of suspended solid particles in horizontal channels. The experimental data in terms of local static pressure gradients dP/dx in flow direction are processed. The referred test cases are (i) horizontal air flow with fully suspended fine solid particles of the size range 75.5 mu m <= d(p) <= 275 pm for the magnitudes of superficial air velocity; U minimum fluidization velocity; U-mf, (ii) air flow through a vertical fixed packed bed of solid particles with d(p)=6000 mu m for U << U-mf. The visual observations at U=U-mf through the vertical beds of solid particles with dp range; 150 mu m <= d(p) <= 2750 pm are also referred. A non-dimensional mode parameter P-center dot. is defined using well-known permeability parameter P-f, mixture density rho(m) and a time parameter t* as an original Contribution. The proposed relationships of P* with air flow Froude Number, Fr and solid particle Froude number Fr-s determine the limits of the flow fields. The magnitude of P* is 1150 for stationary packed solid particles with Fr <= 2. Meanwhile P* <= 2 corresponds to the dilute phase flow of solid particles in air for Fr-s <= 60. The proposed equations can also be used for the determination of solids velocity U-s, U and U-mf in the cited limits of Fr-s, Fr with an acceptable error margin of < 24%. (C) 2016 Elsevier Ltd. All rights reserved.