PARTICLE TECHNOLOGY
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Specific Surface Area per unit Volume

A default set of data is already included in the following table. You can see the stages necessary for calculating the specific surface area per unit volume of a particle distribution. If you have a particle size distribution then you may enter it instead of the default data and press the calculate button - your data will be used in the calculation of the specific surface of your particles. The Sauter mean diameter is also calculated: this is the equivalent spherical diameter by surface area per unit volume to the full distribution, i.e. the particle diameter that has the same specific surface as that of the full distribution. It is always skewed towards the finer end of the distribution.

If you have fewer data points just enter zeros in the remaining boxes. If you have more data points then simply combine some of your data to reduce the number of data sets to the same as that used below.

The only inputs required are the YELLOW input boxes
Index Top of increment

(microns)		 Cumulative
mass undersize
(%)		 Mid
point
(microns)		 Mass fraction
in grade
(-)		 Mass fract'n
by mid size		 Mass fract'n
over mid point
1 100        
2 57.555 0.0154 0.8863 0.00026757
3 21.385 0.0776 1.6595 0.00362871
4 15.395 0.0551 0.8483 0.00357908
5 13.215 0.0716 0.9462 0.00541809
6 11.345 0.0863 0.9791 0.00760688
7 9.74 0.0962 0.937 0.0098768
8 8.36 0.094 0.7858 0.011244
9 7.175 0.0893 0.6407 0.012446
10 6.16 0.0816 0.5027 0.0132468
11 5.285 0.0712 0.3763 0.0134721
12 4.24 0.1069 0.4533 0.0252123
13 3.125 0.065 0.2031 0.0208
14 2.165 0.0465 0.1007 0.0214781
15 1.23 0.0226 0.0278 0.018374
16 0 0 0.39 0.0207 0.0081 0.0530769
                                        
TOTALS:     1.0000 9.3548 0.219727

SELECT       OR YOU CAN       THE ABOVE VALUES


Please note that the following table is ONLY valid for the default set of data - you need to click calculate for your data to be used in a similar calculation, presented on the next page
          
  Mean size by mass: 9.35 microns
  Specific surface area/volume: 1.32 microns-1
  Specific surface area/volume:   1.32x106 m-1
  Sauter mean diameter: 4.55 microns
   

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