Mechanism of Cooling


by sriram123
Tags: cooling, mechanism
sriram123
sriram123 is offline
#1
Mar15-13, 03:11 AM
P: 27
Hi all,
I am not clear with the concept of "Cooling" a body.I know that the temperature of a body is the average kinetic energy of the molecules or atoms in the body.When heat energy is supplied,the molecules have more vibrations and hence the temperature increases.Let us have two bodies at temperatures t1 and t2 where t2 is less than t1.If they are physically contacted (Let us assume heat transfer takes place purely by conduction).Then how does this heat transfer takes place in molecular level?.How does energy flow take place from body 1 to body 2?.(I know that heat flows from high temperature to low temperature but how?).
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DiracPool
DiracPool is offline
#2
Mar15-13, 03:42 AM
P: 492
Quote Quote by sriram123 View Post
Hi all,
I am not clear with the concept of "Cooling" a body.I know that the temperature of a body is the average kinetic energy of the molecules or atoms in the body.When heat energy is supplied,the molecules have more vibrations and hence the temperature increases.Let us have two bodies at temperatures t1 and t2 where t2 is less than t1.If they are physically contacted (Let us assume heat transfer takes place purely by conduction).Then how does this heat transfer takes place in molecular level?.How does energy flow take place from body 1 to body 2?.(I know that heat flows from high temperature to low temperature but how?).
I don't know about a quantum mechanical description, but a classical description would say that the average kinetic energy of the modes of oscillation among the constitutive molecules in bodies t1 and t2 would try to seek equilibrium. This would be manifested as the transfer of heat. How does that happen? Probably in a fashion similar to the volume conduction of current in biological tissue, or..How about this? You're at a party and you and all your friends are jacked up on adrenaline becasue you're having so much fun. However, its your house and you know the noise complaints are coming soon. So..you grab one of your friends who's bouncing off the walls and try to calm him down..So far so good until another buddy comes flying across the room and now you have to grab him too and calm him down. Of course it doesn't take doing this to too many other buddies before you begin to get tired and "cool" down. Of course, by this point, everyone has cooled down a bit, and now the party is more manageable

To put it another way, it's a propagation effect, like falling dominoes, a mechanical agitation that spreads radially from the heated source until equilibrium is achieved in the bounded system.

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