pneumatic conveyingStatic electricity can cause adhesion,In the case of relatively fine powder particles, charging is always accompanied by adhesion phenomena, while relatively coarse powder particles can be a countermeasure to prevent adhesion, as shown in Figure 1. As the particle size increases, the porosity will decrease and eventually tend towards a constant value. This means that it is indirectly affected by adhesive force. The particle size at this constant value is called the critical particle size.

Figure 1

For the critical particle size d. For the following fine particles, the relationship between porosity ε and particle size d is

e=K(1/d_s)ⁿ

If the particle size is increased to the critical particle size d and remains constant, then ε will also remain constant. In the formula, K is the coefficient and n is the exponent.

According to the experiment, the value of d is mostly between 20~30 μ m. In other words, to avoid adhesion (electrification) phenomenon, efforts should be made to ensure sufficient particle size.

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