The sweat on our body evaporate taking energy from our body in the form of heat.the temperature of our body decreases and we feel cool. Thus sweating cools down our body.
Now why does our body cool down faster?
All the sources I have come across to find the answer,as I understan , state that, the fan speeds up the eveporation process ,so sweat eveporates faster taking energy from our body faster,and we get the feeling of chill sooner. However,this does not seem to me to be the actual case.
But my understanding on the following points are,
HOW EVAPORATION SPEED INCREASES WHEN THERE IS AIR FLOWING IN AIR(CAUSED BY THE FAN IN THIS case): The air is flowing becauseof the fan.so the speed of air molecules is greater. They have more kinetic energy .they hit hit the sweat molecules with more kinetic energy. This energy helps the sweat molecules overcome the intermolecular force among themselves and evaporate faster. In a word ,my understanding is that sweat evaporates faster because they are getting the xtra energy to evaporate faster from the flowing air ,and not from the body . Which means the rate of heat energy transfer from my body does not increase in this case.
Then how does my body cool down sooner?
Is it that ,the body starts sweating more when sweat eveporates faster and despite getting some energy from the turbulent air the sweat still takes some energy from the body to evaporate and that is the process that causes the body to lose more heat in a shorter period of time and thus cool down the body faster?