A cascade impactor is used to measure the particle distribution in a stream of air. Analysis shows that the distribution is log-normal with a deo of 7.0 pm and og of 2.0. Assume that the particles have a unit density (1000 kg/m3) and are spherical. (a) Plot the mass of the particle distribution against the size. (b) What is the percent of the mass in the distribution below the size of 2.0 um? The following theoretical efficiencies are known for a cyclone and an electrostatic precipitator treating this stream of particles. Size Range (um) Cyclone Efficiency (%) ESP Efficiency (%) 0-2 10 50 2-4 25 80 95 4-7 45 7-10 70 97 85 98 95 99 10-15 15-25 25-40 40-60 97 100 98 100 >60 100 100 (c) If you were designing a device to reduce the number of particles emitted, which control device would you select? Justify your choice. (d) If you were designing a device to reduce the mass of particles emitted, which control device would you select? Justify your choice. A cascade impactor is used to measure the particle distribution in a stream of air. Analysis shows that the distribution is log-normal with a deo of 7.0 pm and og of 2.0. Assume that the particles have a unit density (1000 kg/m3) and are spherical. (a) Plot the mass of the particle distribution against the size. (b) What is the percent of the mass in the distribution below the size of 2.0 um? The following theoretical efficiencies are known for a cyclone and an electrostatic precipitator treating this stream of particles. Size Range (um) Cyclone Efficiency (%) ESP Efficiency (%) 0-2 10 50 2-4 25 80 95 4-7 45 7-10 70 97 85 98 95 99 10-15 15-25 25-40 40-60 97 100 98 100 >60 100 100 (c) If you were designing a device to reduce the number of particles emitted, which control device would you select? Justify your choice. (d) If you were designing a device to reduce the mass of particles emitted, which control device would you select? Justify your choice