Two banks of cyclones in series with each bank containing 4 cyclones that can be described as type 3 conventional cyclones with a body diameter, d = 5 m (text table 4.2) are used to treat the pm emissions from the power plant. the total gas flow is 500 m3/s, the pm2.5 uer is 40 kg/h, and the fly ash particle density, ρp= 2300kg/m3. assume the maximum particle diameter for particles > 15 μm is 30 μm and calculate treatment efficiencies using the maximum bin diameter value rather than average bin diameter value. 1. determine the % mass removal in the first bank of cyclones and the resulting cumulative mass fraction psd. 2. determine the % mass removal in the second bank of cyclones, overall % mass removal, and the treated cumulative mass fraction psd. 3. would more cyclones in each bank result in greater treatment efficiency? why? 4. would using the same number, but larger cyclones result in greater mass removal efficiencies? why? 5. what is the primary disadvantage or drawback to increasing mass removal efficiencies by changing the number or size of the cyclones?

In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ă—106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?