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GATE CE 2025 Set 2 — Question 63

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NAT+2 / -0HardParticulate Matter ControlAir PollutionEnvironmental Engineering

Environmental Engineering → Air Pollution → Particulate Matter Control

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Question

A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air =0.2 m/s= 0.2\text{ m/s}; Temperature of air stream =77∘C= 77^\circ\text{C}; Specific gravity of particle to be removed =2.65= 2.65; Chamber length =12 m= 12\text{ m}; Chamber height =2 m= 2\text{ m}; Viscosity of air at 77∘C=2.1×10−5 kg/m.s77^\circ\text{C} = 2.1 \times 10^{-5}\text{ kg/m.s}; Acceleration due to gravity (g)=9.81 m/s2(g) = 9.81\text{ m/s}^2; Density of air at 77∘C=1.0 kg/m377^\circ\text{C} = 1.0\text{ kg/m}^3; Assume the density of water as 1000 kg/m31000\text{ kg/m}^3 and Laminar condition exists in the chamber.
The minimum size of particle that will be removed with 100% efficiency in the settling chamber (in μm\mu\text{m}) is ______ (round off to one decimal place).
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