抄録
A simulation model of mixing process presented in the previous paper was based on the assumption that the mixing process is affected by exchanging the positions of high resistance particles with those of low resistance ones in the whole system. In this report, we proposed a modified new simulation model which differs from the previous one in a point that the new one has an expanding mixing zone. By means of this model, the actual mixing process of a stationary mixer with impeller blades fixed on the vertical rotational axis was characterized.
The results obtained were summarized as follows;
(1) Validity of the simulation method for the actual mixing process was confirmed by comparing parameters (σ, R) related to the actual mixing process with those of modified model.
(2) The arrangement of particles and the mixing zone were determined on the basis of the results obtained from the photographic observation during an actual mixing process.
The standard deviation of the total inspection, σTL was found to be affected by the number of samples, N and the sample size, Sn. The optimum values of N and Sn were 16 and 25, respectively.
(3) The value of the sampling fraction, ζ was found to be affected by the sampling conditions. In the spot sampling, when the correlation coefficient between σSL (: Standard deviation in the spot sampling) and Rs (: Total electric resistance calculated by applying the approximation method) was greater than 0.8, the value of ζ became minimum, 20 percent.
(4) The mechanism of actual mixing process seemed to be accounted by the hybridization of two processes, one is the process of expansion of mixing zone and the other is the process of random exchange of position of particles in the mixing zone.
