In a holizontal cylindrical mixer, the circulation flow of particles by the rotation of the mixer consists of the mixing zone and the static mass.
In this report, the thickness of the static mass of particles was analysed with the factors of the radious of mixer, R, the rotation speed of mixer, N, and the total volume of feed particles in the mixer vessel, F.
As a result of this analysis, an experimental equation was derived as a function of Froude number of mixing, N²R/g, and the charge ratio of the particles in the mixer vessel, F/V, as follows:
(h/R)=(1.55-30N²R/g)(F/V)
By using this relation, the circulation time of the particles in the cylindrical mixer can be obtained by:
T=R²(F/V)/(N/60)h(2R-h)
Thus, the mixing time required to reach the desired uniformity of mixture can be calculated when the particles is easily flowable.

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