Step 1: Understanding the Concept:
Pneumatic conveying is a method of transporting bulk particulate materials through closed pipelines using a flowing gas stream, usually air.
Step 2: Detailed Explation:
The movement of materials in pneumatic systems relies on the pressure differential established between the feed point and the discharge point.
This pressure gradient can be generated using positive pressure (blowing systems) or negative pressure (vacuum systems).
In both cases, air pressure differences create high-velocity air streams.
The drag and lift forces exerted by the moving air on the particles overcome gravity and frictiol resistance, carrying the particles through the line.
Therefore, air pressure differences and the resulting aerodymic forces serve as the primary driving mechanism.
Gravity, centrifugal force, and magnetic force are not the primary driving forces, though gravity acts as a resistance force.
Step 3: Fil Answer:
The correct option is (C).