A 2-mm diameter raindrop falls at its tenninal velocity through 1000 ft of air that contains 80 μg/m
(a) How many particles does the drop collect?
(b) What is the percentage increase m mass of the drop due to these particles?
(a) How many particles does the drop collect?
(b) What is the percentage increase m mass of the drop due to these particles?
The moment the cat heard the mice _____ noises, it _____ of the door. |
[ ] |
A. make, rushed out B. making, rushing out C. make, rushing out D. making, rushed out |
Our cyclone separator is operating with Dcut=5μ. It is now necessary to increase the flow rate to the cyclone (and hence the inlet velocity) by 25 percent (i.e., the new velocity will be 1.25 times the old velocity). Nothing else will change. The cyclone is believed to obey Eq. (9.18). Estimate the new cut diameter.
Figure 8.11 suggests that in a typical atmosphere, about one-third of the surface area of the particles is contained in particles with diameter centered about 0.02μ, about one-third in particles with diameter centered about 0.3μ, and about one-third in particles with diameter centered about lOp. If the true situation were that the distribution by air was exactly one-third in each of these diameter ranges and if, instead of the board distributions shown in Fig 8.11, all of the particles were exactly either 0.02, 0.3 0r 10μ in diameter, then
(a) What would the fraction by weight be for each of the three particles sizes?
(b) What would the fraction by number be for each of the three particles sizes?
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