If you drop a metal ball heated to 1,000 degrees onto a pineapple peel, you will encounter a surprising phenomenon. Pineapple peel will not burn, catch fire or evaporate. So, how is this possible?
Many of us, up to 1,000 degrees a heated metal ball We think that if dropped on something it will burn, right?
However on pineapple peel When you try something like this, you will encounter a very interesting situation…
Can we really say that pineapple peel is a super material? In our opinion, yes. It is worth taking a look at the video:
In the video, you notice that the pineapple peel is barely damaged until the metal ball loses its orange glow. So how is this possible? Pineapple can actually be used to make armor A super material?
This situation is actually explained by the Leidenfrost effect, which is an interesting feature of heat transfer.
The effect is not just on pineapples, It can also be seen in some other fruits such as watermelon. According to Seppo Louhenkilpi from the Department of Chemical Technology at Aalto University, heat transfer is affected by a factor known as the Leidenfrost temperature.
Above this temperature, a surface is so hot that when it comes into contact with liquid, a vapor layer forms and The liquid does not come into direct contact with the surface.
One place you may have seen this effect before is when you drip liquid onto a hot surface These are small balls that form. Similarly, when you place a really hot ball in water, the ball itself does not touch the water and a small bubble of steam forms.
We can say that this means for heat transfer: On surfaces above the Leidenfrost temperature The heat transfer rate does not change much. On surfaces below the Leidenfrost temperature, the relatively cooler hot surface can come into direct contact with the liquid and significantly increase the heat transfer rate.
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