What is the mean particle size of particles? What is a particle size distribution curve?

       Q: What is the average particle size of particles?

Answer: There are many kinds of average particle size of particles. For single particles, since the particle shape is not a standard sphere, the volume-average diameter, the surface-area-average diameter, and the surface-volume-average diameter can be determined separately according to the same volume, the same surface area, or the same surface-to-volume ratio. For particle populations, the size distribution and compositional properties of particle populations can be determined by sieving through a series of standard mesh size sieves. If the particle size range is large, it is called wide sieving; if the particle size range is small, it is called narrow sieving. For broadly sieved particle populations, the particle size distribution of the solid particles and thus the mean diameter of the particle population can be determined from the sieving. In engineering, the median particle size of particles is often used to measure the thickness of the broad sieve particle group.





Q: What is a particle size distribution curve?



Answer: The particle size distribution curve is a curve drawn based on the amount of material particles on the screen and the amount under the screen or the mass share of particles within a certain particle size range. The particle size distribution curve includes frequency distribution curve and cumulative distribution curve.



In the particle size analysis of solid particles, the relationship between the number of particles in a certain size or a certain size range and the particle size is often referred to as the frequency distribution curve. The connecting line is the approximate particle size distribution curve of the material. The peaks correspond to the particles with the most occurrences. If the interval between the particle size ranges is smaller, the result will be closer to the true particle size distribution curve. The over-sieve distribution and under-sieve distribution curve is a curve that uses the accumulation rate as a parameter to represent the regularity of particle distribution. The abscissa represents the particle size dp, the ordinate represents the cumulative mass share, the under-sieve distribution represents the cumulative mass share of particles below the corresponding particle size, and the over-sieve distribution represents the cumulative mass share of particles above the corresponding particle size.