The bulk density is the density of the bulk of the particles, included the voids in between each particles. 2 bulk densities are usually measured :
- Loose Density
- Tapped Density
Equation 1 : Solids Bulk Density
When measuring the loose density, the powder must be in its aerated state.
Figure 1 : Measuring loose bulk density
When measuring tapped density, a step of powder compaction is necessary.
Figure 2 : Measuring tapped bulk density
Bulk density is used, among other purposes, to calculate the sizes of vessels in the process (hoppers, silos...)
A weighing hopper must hold a maximum of 500 kg
The loose density of the powder dosed is 0.34 kg/l
The required useful volume of the hopper must be 500/0.34=1470 liters (be careful here to angle of repose of the powder to calculate the total volume of the hopper)
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