Combined forced and natural convection
When things get hot, they can start moving around on their own - this is called "natural convection". Imagine if you had a pot of boiling water on the stove - you would see bubbles rising to the top and steam coming off. This is because the heat from the stove is making the water hot, which makes it start to move around on its own.
Now, sometimes we want to make things get hot faster or move around more, so we need to help the natural convection along. We can do this by adding a fan or a pump to push the hot stuff around - this is called "forced convection". If we continue with our pot of boiling water example, we could turn on a fan to blow air over the pot, which would help the steam move away faster.
When we combine these two things - natural convection and forced convection - it's called "combined forced and natural convection". This is kind of like having a friend help you push a big heavy box - it's easier to move when you both work together.
So, if we go back to our boiling water example, if we added a fan to our pot of water, it would help the steam move around faster and get rid of the heat faster. This would make the water boil faster and be ready to use sooner.
Now, sometimes we want to make things get hot faster or move around more, so we need to help the natural convection along. We can do this by adding a fan or a pump to push the hot stuff around - this is called "forced convection". If we continue with our pot of boiling water example, we could turn on a fan to blow air over the pot, which would help the steam move away faster.
When we combine these two things - natural convection and forced convection - it's called "combined forced and natural convection". This is kind of like having a friend help you push a big heavy box - it's easier to move when you both work together.
So, if we go back to our boiling water example, if we added a fan to our pot of water, it would help the steam move around faster and get rid of the heat faster. This would make the water boil faster and be ready to use sooner.