# PARTICLE TECHNOLOGY

location: >Filtration >Specific surface

# 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'nby 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