Radiation (cont. 3)
Question: Can microwave-oven heating process be considered one kind of heat transfer mode?
Strictly speaking, it is not. It heats up food through microwave radiation, not thermal radiation. However, when microwave energy (with very high frequency) interacts with water molecules inside the food, it generates heat inside the food. Therefore, it can be modeled as some forms of heat generation but not relate to any modes of heat transfer.