DESIGN AND FABRICATION OF A HAIR DRYER
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ABSTRACT
A hair dryer is an electromechanical device designed to blow cool or hot air over damp hair, in order to accelerate the evaporation of water particles and dry the hair. Hairdryers allow to better controlling the shape and style of hair, by accelerating and controlling the formation of temporary hydrogen bonds inside each strand. These hydrogen bonds are very powerful (allowing for stronger hair shaping than even the sulfur bonds formed by permanent waving products), but are temporary and extremely vulnerable to humidity. They disappear with a single washing of the hair.
Hair dryer use coils of wire that have a high electric resistivity and heat rapidly with an electric current. A fan (usually powered by a universal motor) blows ambient air past the hot coils resulting in heated air effective for drying. The heating element in most dryers is a bare, coiled nichrome wire that is wrapped around insulating mica heating boards. Nichrome wire is used in heating elements, because of two important properties: it is a poor conductor of electricity and it does not oxidize when heated.
