準剛体回転成層流を用いた微粒子分級の基礎研究 : 第4報, 実験による分級性能の考察

We took into consideration the classification efficiency in our experiments of an almost rigidly rotating flow between the rotating housing with a spherical wall and the rotor with combined spherical and cylindrical walls. The conclusions are as follows. (1) We obtained the highest sharpness index value of 1.25, which is comparable to that of the recent centrifugal classifiers, in spite of the low rotation number. (2) The values of the cut size and the sharpness index decrease with decreasing Ekman number (rotation number) or Rossby number (through-flow rate). (3) The dispersion rate of feed particles is improved by installing a dispersion nozzle and an orifice near the classification field.