Discussion
A baghouse treats \( 30 \) m\(^3\)/s with \( 900 \) m\(^2\) of fabric. Its air to cloth ratio is
Answer: B
Correct answer: 0.033 m/s
The air to cloth ratio is gas flow over fabric area:
\[ \frac{30}{900} = 0.033 \ \mathrm{m/s} \]It has the units of a velocity and is often called the filtration velocity. Values around 0.01 to 0.02 m/s are usual for reverse air cleaning and 0.03 to 0.05 for pulse jet; too high a ratio drives dust into the fabric, raises the pressure drop and shortens bag life.
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