In the field of heating and energy, what is convection has to be one of the most mysterious concepts. This is because no one is quite sure how it works. It is also very difficult to study in a laboratory setting since there is usually too much material to handle. In this article, we will discuss what convection and its implications are.
In layman’s terms, what is convection refers to the transfer of thermal energy between hot and cold objects. In simple terms, it is the movement of air molecules through a medium that is heated. In the case of the heated liquid or gas, the hot liquid flows over the cooler to colder ones, hence the name “convection”. While convective currents are mostly observed at high temperatures, they are also important in all kinds of fluid transfers, such as in the case of moving particles transfer thermal energy currents.
A little bit of physics can help us understand what is convection, but the real answer is that it is an ocean of phenomena, which are often too difficult to study in a laboratory environment. However, the theory is quite simple. The principle of how heat transfer takes place is a matter of mathematics known as the Clausen law. Basically, the hotter something gets, the faster it becomes conduction. In essence, the hotter a fluid is, the faster heat is transferred from it to another fluid at a particular temperature.
In all cases, what is convection, then, is the conversion of thermal energy into mechanical energy. It occurs in all kinds of fluids, but the phenomenon is most commonly observed in the heat transfer between the hot water and the surrounding air. While convection occurs in all kinds of fluids, the most common are in the water. For example, in the heated bath you would hear a distinct humming sound as the circulatory processes took place.
So, the question we need to ask is what is convection? In reality, there really is no one answer to this question. As a matter of fact, it really depends on the circumstances. Take, for example, a person walking in a room with a fan overhead. How fast does the fan to move air, and how fast is the heat transfer from the top of the room to the bottom?
One can easily examine the microwave ovens and other convector devices and find that the speed with which the heated air flows through the device varies depending on its orientation with respect to the circulating air mass. While convectors used in microwave ovens are designed to maintain a fixed temperature while heating a cavity, they do not appear to be affected by the presence of any liquid or gas. As a result, the microwave ovens’ performance in heating food remains unaffected by the presence of liquid.
The problem is, of course, when an oven is used to cook foods that are rich in liquids. To start with, the rate of heat transfer changes from the convector’s design. In the microwave ovens, the temperature does not remain constant because of the variation in air movement. As the heated air cools down, the temperature variation also causes the heating element to speed up or slow down. Consequently, one ends up cooking unevenly cooked dishes.
However, when the ovens are used to heat food in their most pure form, such as when cooking eggs, the problems encountered in the previous example are rendered irrelevant. In this case, the variation in the temperature caused by the circulating air is much reduced. It has to be said that the performance of what is convection ovens is not that different from the ones used for baking. In both the cases, the connector should be made of a good quality material. Otherwise, it will only lead to overheating and irregular cooking.