Question

Which of the following is/are the dominant mechanism(s) for the removal of spherical particles with diameter less than 10 µm from a gas stream using a fabric filter?

• A. Impaction
• B. Gravitation
• C. Interception
• D. Diffusion

Hint:

For small particles (less than 10 µm), impaction, interception, and diffusion are the primary mechanisms for removal in fabric filtration systems.

Answer 1

The Correct Option is A, C, D

In fabric filtration, small particles with diameters less than 10 µm are primarily removed through mechanisms such as impaction, interception, and diffusion:
- Impaction occurs when particles in the gas stream collide with the fibers of the filter and get trapped.
- Interception happens when particles are intercepted by fibers as they flow through the filter.
- Diffusion is the process where smaller particles, influenced by Brownian motion, move randomly and are more likely to encounter and adhere to the fibers.
Gravitation (option B) is not a significant mechanism for particles smaller than 10 µm, as their small size makes them less likely to be affected by gravity. Therefore, the correct answer is (A), (C), and (D).
Final Answer: \[ \boxed{(A), (C), (D) \, \text{Impaction, Interception, Diffusion.}} \]