What is heat transfer and explain various modes of heat transfer?

Quick Notes:-

What is heat transfer and explain various modes of heat transfer?

Ans.-Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy and heat between physical systems.

The three modes of heat transfer are:-

(i)Conduction

(ii)Convection

(iii)Radiation

(i)Conduction

Heat conduction occurs as hot, rapidly moving or vibrating atoms and molecules interact with neighboring atoms and molecules, transferring some of their energy (heat) to these neighboring particles.Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact.

(ii)Convection

Convective heat transfer, or convection, is the transfer of heat from one place to another by the movement of fluids, a process that is essentially the transfer of heat via mass transfer.Convection is usually the dominant form of heat transfer in liquids and gases.

(iii)Radiation

Thermal radiation is energy emitted by matter as electromagnetic waves, due to the pool of thermal energy in all matter with a temperature above absolute zero. Thermal radiation propagates without the presence of matter through the vacuum of space.Thermal radiation is a direct result of the random movements of atoms and molecules in matter.