單元大綱

  • 展延 展延

    一般

    全部收合 展開全部
    • Japanese 網址

    • Professor Seki retired from Hokkaido University in March, 2024.

  • 展延 展延

    Particle size distribution

    ➤Frequency distribution curve

    ➤Cumulative distribution curve


  • 展延 展延

    Representative particle size and definition

    Stokes diameter

    Particle diameter calculated from Stokes formula

    Specific surface area diameter

    Particle diameter based on specific surface area

    Mode diameter

    Particle diameter with the largest frequency distribution

    Median diameter

    Particle diameter at which the residual (pass-through) ratio is 0.5



  • 展延 展延

    Frequency distribution curve



    • アオコ　Blue-green algae

      酵母　Yeast

      珪藻土　Diatomaceous earth

  • 展延 展延

    Cumulative distribution curve

    • Residual rate curve (R-curve) and passage rate curve (P-curve)


      フルイに「残留」する分画　Fraction "remaining" in the sieve

      フルイを「通過」する分画　Fraction "passing" through the sieve

    • Residual curves: R-curve


      Percentage of the total amount of particles larger than a certain particle size


      Passage curve: P-curve


      Percentage of the total amount of particles smaller than a certain particle size


      P = 1 - R

  • 展延 展延

    Particle size distribution

    • ➤Frequency distribution curve

      ↓Integration　↑ Differentiation

      ➤Cumulative distribution curve

    • Frequency Distribution Curve


    • Residual rate distribution: R curve


    • Passage rate distribution: P curve (P = 1 - R)


  • 展延 展延

    Rosin-Rammler Equation

    • ➤Empirical equation for the residual curve


      De ：Particle size with a residual of 0.37 (D/De = 1)

      n ：The larger this value, the more uniform the particle size.