How a Microwave Oven Works | Complete Guide About Oven Working

 How a Microwave Oven Works | Complete Guide About Oven Working




Special thanks to engineerguy youtube channel


How an Microwave Works This microwave oven is truly a remarkable engineering feat. The rapid heating that makes microwaves popular is made possible by the energy provided by this vacuum tube. If you're imagining a vacuum tube, you're probably sitting on a radio like this. Inevitably, tiny transistors and microchips have taken the place of bulky vacuum tubes, but it's too early to relegate them to the museum. Microchips cannot easily replace pipes to generate electricity. For example when you heat up food. However, a microwave contains three main components. A vacuum tube called a microwave generates energy that heats food. A waveguide hidden in the wall to direct this energy to the food and a chamber to hold the food and safely trap the microwave radiation. In principle, a microwave does not heat differently than any other form of heat transfer. At the molecular level, heat is a transfer of energy that results in increased movement of molecules in a substance. Since we are not quantum size, we see this increase in motion as an increase in temperature. In a traditional oven or stove, we heat food by placing a pan on a burner or in the oven whose walls radiate heat, which cooks the outside of the food. The interior cooks when heat is transferred from the surface of the food to the interior. Rather, the energy from the microwave enters the food, which means that the entire mass of the food can be cooked at the same time. How do you do that? Well, our food is filled with water, which is positively charged on one side and negative on the other. To give these molecules more energy, we expose them to the electromagnetic waves coming from the tube. Waves, by definition, have electric and magnetic fields that change direction quickly. For this furnace, the direction of the fields changes two point four five billion times per second.




The water will try to adapt to the electric field of the radiation. The changing field causes the water molecules to oscillate quickly, and the resulting molecular friction creates heat as the motion breaks the hydrogen bonds between nearby water molecules. Now you can get an idea of ​​the wavelength of the energy emitted by the microwave using cheese. Now here you see the sections where the cheese is completely melted and other sections where it is completely unheated. The metal walls of the kiln reflect only waves of a length that will fit into the kiln. This standing wave causes hot and cold spots in the oven. The three-dimensional wave pattern is difficult to predict, but the principle can be seen by looking at waves in one dimension. The peaks and valleys of the wave represent the wave's highest energy, while the nodes here correspond to the "cold" points in the chamber. If I measure the distance between the melted cheese spots, I find about 2 1/2 inches. This would be half the wavelength of the distance between the nodes and is quite close to the actual wavelength of the microwave radiation used. Using this wavelength I can estimate the frequency of microwave radiation. Frequency is related to wavelength by the speed of light. I get an answer that is only 4 or 5% wrong. Not bad for this primitive measure. Now the real technique of the microwave oven lies in the creation of the microwave oven that generates high-power radio waves. It is really an amazing and revolutionary device. The vacuum tube is here. These are cooling fins, thin pieces of metal that dissipate heat when the microwave is in operation. The main parts are these two magnets and the vacuum tube. Now I have one more to look inside. Apply high voltage through the inner filament and outer circular copper. This voltage "cooks" the electrons in the central filament and they fly to the circular portion of copper. The filament is made of tungsten and thorium. Tungsten because it can withstand high temperatures and thorium because it is a good source of electrons. The magnets bend these electrons back toward the central filament. The magnetic force is adjusted so that the orbiting electrons pass through the opening of these cavities. Like blowing a half-full soda bottle to make it sizzle, it creates an oscillating wave — microwave radiation that heats food. It is simply amazing that these cavities can be made with high precision, low cost and incredibly high reliability. I'm Bill Hammack, the engineer. This video is based on a chapter from the book Eight Amazing Engineering Stories. The chapter provides more information on this topic. Read more about the book at the following address.





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