11-Modes of Heat Transfer

• Heat transfer is the study of the flow of heat.
  
  

• Heat transfer is energy transfer due to a temperature difference in a medium or between two or more media.
  

Different types of heat transfer processes are called different modes of heat transfer.

• Conduction heat transfer is due to a temperature gradient in a stationary medium or media.

• Convection heat transfer occurs between a solid surface and a moving fluid.

• Radiation heat transfer occurs due to emission of energy in the form of electromagnetic waves by all bodies above absolute zero temperature.

  Net radiation heat transfer occurs when there exists a temperature difference between two or more surfaces emitting radiation energy.