Question

A gravity settling chamber of height ‘H' and length ‘L' is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is $'V_h'$ and terminal settling velocity of the target particle is $'V_ť$. Which one of the following expressions is the correct concept used to calculate the minimum size of the target particle that will be removed with 100% efficiency?

• A. $\frac{V_t}{L} = \frac{V_h}{H}$
• B. ${V_h}\times {V_t} = L \times H$
• C. ${V_h} = V_t \times L \times H$
• D. $\frac{V_t}{H} = \frac{V_h}{L}$

Answer 1

Answer: (D)

$\frac{V_t}{H} = \frac{V_h}{L}$

Answer 2

The correct answer is (C) : $H_2S$