PPT: Conduction - 1D | Heat Transfer - Mechanical Engineering PDF Download

 Page 1


• It is the transfer of heat from one body to other body by 
means of physical contact.
•Its majorly can seen in solids .
•It can also be seen in liquids and gases but its 
negligible. 
Page 2


• It is the transfer of heat from one body to other body by 
means of physical contact.
•Its majorly can seen in solids .
•It can also be seen in liquids and gases but its 
negligible. 
Physical mechanism
There are 2 mechanisms 
1)By molecular interactions
Page 3


• It is the transfer of heat from one body to other body by 
means of physical contact.
•Its majorly can seen in solids .
•It can also be seen in liquids and gases but its 
negligible. 
Physical mechanism
There are 2 mechanisms 
1)By molecular interactions
1) Molecular interaction
on taking heat, the molecules remains stationary but they 
vibrate in their lattice which imparts energy on 
neighbouring particles in the direction of low temperature 
and hence conduction takes place.
2)By drift of free electrons
• In case of metals they have more free electrons which 
moves and collides with other electrons on supplying heat 
energy thus causes the heat transfer.
Page 4


• It is the transfer of heat from one body to other body by 
means of physical contact.
•Its majorly can seen in solids .
•It can also be seen in liquids and gases but its 
negligible. 
Physical mechanism
There are 2 mechanisms 
1)By molecular interactions
1) Molecular interaction
on taking heat, the molecules remains stationary but they 
vibrate in their lattice which imparts energy on 
neighbouring particles in the direction of low temperature 
and hence conduction takes place.
2)By drift of free electrons
• In case of metals they have more free electrons which 
moves and collides with other electrons on supplying heat 
energy thus causes the heat transfer.
EXAMPLES
In Manufacturing In Heat Exchanger
In Electronics
In Everyday 
Life
Page 5


• It is the transfer of heat from one body to other body by 
means of physical contact.
•Its majorly can seen in solids .
•It can also be seen in liquids and gases but its 
negligible. 
Physical mechanism
There are 2 mechanisms 
1)By molecular interactions
1) Molecular interaction
on taking heat, the molecules remains stationary but they 
vibrate in their lattice which imparts energy on 
neighbouring particles in the direction of low temperature 
and hence conduction takes place.
2)By drift of free electrons
• In case of metals they have more free electrons which 
moves and collides with other electrons on supplying heat 
energy thus causes the heat transfer.
EXAMPLES
In Manufacturing In Heat Exchanger
In Electronics
In Everyday 
Life
Fourier's law of conduction
• Rate of heat conduction is proportional to the area
measured normal to the direction of heat flow, and to the 
temperature gradient in that direction.