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Consider the following:1. Increasing evaporation rate using convection heat transfer from hot gases.2. Increasing evaporation rate using radiation.3. Protecting the...

Question

Consider the following:1. Increasing evaporation rate using convection heat transfer from hot gases.2. Increasing evaporation rate using radiation.3. Protecting the refractory walls of the furnace.4. Increasing water circulation rate. The main reasons for providing water wall enclosures in high pressure boiler furnaces would include:(a) 2 and 3(b) 1 and 3(c) 1 and 2(d) $1,2,3$, and 4

Consider the following: 1. Increasing evaporation rate using convection heat transfer from hot gases. 2. Increasing evaporation rate using radiation. 3. Protecting the refractory walls of the furnace. 4. Increasing water circulation rate. The main reasons for providing water wall enclosures in high pressure boiler furnaces would include: (a) 2 and 3 (b) 1 and 3 (c) 1 and 2 (d) $1,2,3$, and 4



Answers

Make up a multiple-choice question about evaporation and condensation energy changes.

This problem wants us to rationalize why these different factors have on ah rapper of evaporation rates. And so first we have this I M f, which is inter molecular forces. And so if you have greater in molecular forces, so mawr attraction between the two molecules, you are going to have it. It's going to be much harder to evaporate, so harder to evaporate with greater, greater I m f harder to you, fat or it now temperature. You can just use the example of water as we can see every day when it is really cold outside and you have, and you just put some water on the ground. It's going to take a lot longer to evaporate than if you are on a hot, sunny day. So increasing the temperature, therefore makes it easier to evaporate easier. Here evaporate, it's to evaporate faster. Oh, spell evaporator on evaporate faster now. Service area A good um, a good picture that I've always used is if you have a glass of water for here and you put some water in it. And how long would this take to evaporate compared to if you just had a large? If you put that same amount of water and a large puddle on the ground. It would be it would take a lot less time for this one to evaporate than it would for the glass of water. Because you have much more of the surface area of the water actually in contact with the air to evaporate. Because this water underneath can't evaporate because it has this water on the top has to evaporate first, so increase in surface area leads to quicker that operation quicker e that.

To help depict the he transfer method going on. In this problem, I drew a quick picture to show what it would look like. So on the outside, we see the container that the vacuum is in and inside we see the container with a liquid is held. The blue molecules really represent the liquid, and in here there is no molecules, which represents up the containers in a vacuum. So first to see if this man's conduction we know it isn't conduction because he must be transferred with direct material collision and considering now nothing is in contact with the liquid and the container. We can determine that it's not conduction to see a confection is one of the methods of heat transfer that could possibly be used. We know that conviction is between to materials that aren't directly touching, and they passed your medium like water air. Considering there is no medium because it's in a vacuum, we know it can't be conviction and with radiation keep is transferred with transferred with mission of electromagnetic waves, which can pass through a vacuum. So from that we can determine that radiation is the method. If he transferred, that would have heated the liquid inside the vacuum

The reparation is a change of state. Ah, liquid into. I guess the liquid is held together by strong into molecular bonds. So if it to form a guess, you need to break those into molecular bones. To break the bombs requires energy, and that energy is usually derived from the surroundings as eight. So if we look at a simple container with the liquid in it, it's going toe. Have lots of particles present on the old hold together by some form of internal regular bonding at the surface. Some of these particles are gonna have sufficient energy that those bonds were able to be broken and thus particles into the A the atmosphere. So what can speed up the rate of reparation? Will The strength of the inter molecular bonds is going to affect the rate of operation? The stronger the bonds, the slow of evaporation because mawr image of energies acquired to break them so stronger bonds, slower evaporation. An example. He's if I had to Biggers of estern sitting on the bench, the ass atone would evaporate very, very quickly due to the weak force is holding the molecules together, but the water would take much much longer to evaporate. Surface Syria. Obviously, if you have a greatest surface area, then there's more chance that they will be molecules of the surface with sufficient energy to be able to escape the liquid, so increasing the surface area would lead to an increase in the rate of reparation. So imagine if I was to have some water sitting on a very big wide dish as opposed to the same amount of water sitting in a glass. The water on the wide dishes going toe evaporate faster, and the last affect er or one of the other factors that can affect the rate of reparations temperature. Remember that the high the temperature, the more energies present. Therefore, the more energy can break the bonds and the liquid containing toe guests a lot quicker so that increasing the temperature would lead to end increase. I mean evaporation.

Transfer we've already talked about conduction with Is he transfer between two objects and direct contact. Another method is radiation, which occurs between an object and just the surrounding air, and the heat is moving in waves and is transferred that way.


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