PARTICLE SIZE ANALYSIS ( TANE BOYUT ANALÄ°ZÄ° )

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PARTICLE SIZE ANALYSIS


Sieving is rarely carried out on a routine basis below about 40 µm; below this size the operation is referred to sub-sieving.

The most widely used procedures;

   Sedimentation
   Elutration
   Microscopy
   Electron microscopy

Stokes Equivalent Diameter

   In sedimentation technique the material to be sized is dispersed in a fluid and allowed to settle under carefully controlled conditions
   In elutriation techniques samples are sized by allowing the dispersed material to settle against a rising fluid velocity.

Both techniques separate the particles on the basis of resistance to motion in a fluid.   

This resistance to motion determines the terminal velocity which the particle attains as it is allowed to fall in a fluid under the influence of gravity.

For particles within the sub-sieve range , the terminal velocity is given by the equation derived by Stokes namely:


 

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