Particle shapes were measured based on the random positioned (R) method, th
e stable positioned (S) method and the stable positioned/constant orientate
d (S/C) method. The mean values <(<phi>)over bar> and <(<zeta>)over bar> of
two shape indices (circularity phi and smoothness zeta), previously define
d, were calculated. It was found that smoothness <(<zeta>)over bar> was lit
tle affected by shape measuring methods, while circularity <(<phi>)over bar
> differed according to methods. By analyzing the change in circularity usi
ng model ellipsoidal particles, it was confirmed that the R method could mo
re effectively evaluate particle shapes than can the S method, based on the
results of the S/C method.