HOW A MICROWAVE OVEN WORKS
Author: langfeng1 Time: 2017-05-17
A microwave oven works as follows:
1.Electrical energy, in the form of low-voltage alternating current and high-voltage direct current, is transformed and converted into direct current.
2.A magnetron uses this direct current and generates microwaves with a frequency of 2450 megacyles per second or 2.45 GHz (gigahertz).
3.The microwaves are directed by an antenna at the top of the magnetron into a waveguide.
4.The waveguide channels microwaves to a fanlike device called a stirrer which disperses them inside the oven cavity.
5.The microwaves then reflect off the metal walls of the oven's interior and are absorbed by molecules in the food.
6.Because each wave has a positive and negative component, the molecules in the food are jostled back and forth at twice the rate of the microwave frequency, namely 4.9billion times a second.
The most prominent characteristic of microwave heating is volumetric heating, which is quite different from conventional heating wherethe heat must diffuse infrom the surface of the material. Volumetric heating means that materials can absorb microwave energy directly and internally and convert it to heat. It is this characteristic that leads to advantages using microwaves to process materials.
microwave muffle furnace; microwave tube furnace;
microwave lab furnace; microwave sintering furnace;
microwave expansion furnace; microwave pyrolysis furnace;
microwave pusher kiln; microwave rotary kiln;
microwave high temperature melting furnace;
microwave dental zirconia sintering furnace;