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风筒

20世纪初的风筒

风筒是一种可将头发吹干的电器,在19世纪末发明。现代风筒以电动方式加速空气流动速度,故产生风,并同时提高空气温度的机械装置。大部分的风筒都会经过发热线吹出风,加速水分蒸发,而冷风则对头发的伤害相对地小。

风筒吹出来的风,是携带提高动能的空气分子,在碰撞微小水珠表面的水分子的过程中转移动能,使之打断水分子之间的氢键,脱离原本附着的表面(即蒸发),头发因而变干。如吹出的是热风,其能量更能提高空气分子与水分子震荡与碰撞的能量,并加速蒸发,所以增加干燥的效率。

工业用途的风筒常称为热风枪,运作原理相同,但风量通常较小、吹出的热风温度较高,在电子业常用来解焊电子零件。

比较现代的风筒

相关条目

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风筒
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