Experiments were carried out to obtain basic informations on mixing rate of solid partcles by air-blending. Using a cylindrical apparatus of 12cm in diamter, Mixing rate was calculated from the variation of concentrations of marked particles sampled from the mixture. Results obtained were:
1) Coefficent of Mixing rate φ was expressed by φ=k₁exp [k₂(u₂/u₁)+k₃(u₁/n_mf)] Where, u₂ is the velocity of air issured from active part of perforated plate, u₁ is the velocity from non active part of perforated plate and u_mf is the incipient fluidization velocity measured on the condition u₁=u₂.
2) The exchang of position of solid particles in the region above the non active part of perforated plate determines the degree of Mixing by air blending.