Previous studies for estimating randomness of a binary solid particle system have shown that the total electric resistance,
RS calculated by an approximation method is closely related to the degree of mixing.
In this report, in order to estimate the randomness of the system, a parameter of short range disorder, σ
S was introduced as a criterion of the degree of mixing of the system. The short range disorder was difined as a ratio
TC/
TS, where
TC represents the number of contact points between particles with different resistance (A particles and B particles) and
TS represents the total number of contact points of all particles.
The values of degree of mixing obtained from two different methods (one is the spot sampling and the other is the total inspection) were compared with the values of the parameter of short range disorder. Furthermore, in order to assess these methods, the correlation functions between σ
S vs. σ
TL, σ
S,
vs. σ
SL, σ
S vs. RS, σ
TL vs. RS and σ
SL vs. RS were calculated, where σ
S is the parameter of short-range disorder, σ
TL is the standard deviation of the total inspection, and σ
SL is the standard deviation of the spot sampling.
The computer simulated results showed that each correlation function described above is valid. Consequently, the total electric resistance calculated by an approximation (series and parallel) method can be used for the purpose of estimating randomness during the mixing process. However, in the spot sampling, the calculated values of degree of mixing was found to be affected by the number of samples and the sample size.
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