Bulk Density

Section summary
1. Definition
2. Calculation
3. Measurement
4. Application

1. Definition

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

2. Calculation

PowderProcess.net - Bulk density

Equation 1 : Solids Bulk Density

3. Measurement

When measuring the loose density, the powder must be in its aerated state.

PowderProcess.net - Loose Bulk density measurement

Figure 1 : Measuring loose bulk density

When measuring tapped density, a step of powder compaction is necessary.

PowderProcess.net - Tapped Bulk density measurement

Figure 2 : Measuring tapped bulk density

4. Application

Bulk density is used, among other purposes, to calculate the sizes of vessels in the process (hoppers, silos...)

Example
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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