HEAT AND MASS TRANSFER

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1. Define Heat transfer?
Heat transfer can be defined as the transmission of energy from one region to another region to
temperature difference. `

2. What are the modes of heat transfer?
1. Conduction
2. Convection
3. Radiation

3. What is conduction?
Heat conduction is a mechanism of heat transfer from a region of high temperature to a region of
low temperature with in a medium (Solid, liquid or Gases) or different medium in direct physical contact.
In conduction, energy exchange takes place by the kinematics motion or direct impact of
molecules .Pure conduction is found only in solids.

4. Define convection.
Convection is a process of heat transfer that will occur between solid surface and a fluid medium
when they are at different temperatures. Convection is possible only in the presence of fluid medium.

5. Define Radiation.
The heat transfer from one body to another without any transmitting medium is known as
radiation .It is an electromagnetic wave phenomenon.