Mechanical Engineering Exam > Mechanical Engineering Notes > Heat Transfer > PPT: Convection
PPT: Convection
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Page 1
CONTENT:
•
Basic Definitions
•
Natural And Force Convection
•
Factor Affecting convective Heat Transfer Coefficient
•
Nusselt Number And Prandlt Number
•
Dimensional Relationship of Natural Convection With Gr and Pr
Page 2
CONTENT:
•
Basic Definitions
•
Natural And Force Convection
•
Factor Affecting convective Heat Transfer Coefficient
•
Nusselt Number And Prandlt Number
•
Dimensional Relationship of Natural Convection With Gr and Pr
BASICS DEFINIONS
1. Heat Transfer:
Heat Transfer Define As The Transmission of Energy From One Region to another Region
as a result of Temperature Gradient.
•
Conduction:
Conduction Transfer Heat via Direct Molecular Collision. Area of Greater kinetic energy will
Transfer Thermal energy to an area with lower kinetic energy.
•
Convection:
When a Fluid, such as air or Liquid, is heated and then travels away
from the source, it carries the thermal energy along. This type of Heat
Transfer is called convection.
•
Radiation:
Thermal Radiation Generates from the emission of electromagnetic
waves. These waves carry the energy away from the emitting object.
Page 3
CONTENT:
•
Basic Definitions
•
Natural And Force Convection
•
Factor Affecting convective Heat Transfer Coefficient
•
Nusselt Number And Prandlt Number
•
Dimensional Relationship of Natural Convection With Gr and Pr
BASICS DEFINIONS
1. Heat Transfer:
Heat Transfer Define As The Transmission of Energy From One Region to another Region
as a result of Temperature Gradient.
•
Conduction:
Conduction Transfer Heat via Direct Molecular Collision. Area of Greater kinetic energy will
Transfer Thermal energy to an area with lower kinetic energy.
•
Convection:
When a Fluid, such as air or Liquid, is heated and then travels away
from the source, it carries the thermal energy along. This type of Heat
Transfer is called convection.
•
Radiation:
Thermal Radiation Generates from the emission of electromagnetic
waves. These waves carry the energy away from the emitting object.
Natural And Force Convection
•
Natural Convection is a type of heat transfer, in which the fluid motion is not generated by
any external source (like a pump, fan, suction pump etc.) but only by density differences in the
fluid occurring due to temperature gradients.
•
The Example of free convection is a heated plate when kept in an atmosphere, it gets cooled by air.
Here the circulation of air take place due to density difference, which is caused by temperature
difference between solid plate and air.
•
Natural convection is the process of heat transfer which occurs due to movement of the fluid
particles by density change associated with temperature differential in a fluid.
•
Some Example are given below:
1. The cooling of electrical transformers and
rectifiers.
2. The heat transfer from hot pipes by cooled air .
Page 4
CONTENT:
•
Basic Definitions
•
Natural And Force Convection
•
Factor Affecting convective Heat Transfer Coefficient
•
Nusselt Number And Prandlt Number
•
Dimensional Relationship of Natural Convection With Gr and Pr
BASICS DEFINIONS
1. Heat Transfer:
Heat Transfer Define As The Transmission of Energy From One Region to another Region
as a result of Temperature Gradient.
•
Conduction:
Conduction Transfer Heat via Direct Molecular Collision. Area of Greater kinetic energy will
Transfer Thermal energy to an area with lower kinetic energy.
•
Convection:
When a Fluid, such as air or Liquid, is heated and then travels away
from the source, it carries the thermal energy along. This type of Heat
Transfer is called convection.
•
Radiation:
Thermal Radiation Generates from the emission of electromagnetic
waves. These waves carry the energy away from the emitting object.
Natural And Force Convection
•
Natural Convection is a type of heat transfer, in which the fluid motion is not generated by
any external source (like a pump, fan, suction pump etc.) but only by density differences in the
fluid occurring due to temperature gradients.
•
The Example of free convection is a heated plate when kept in an atmosphere, it gets cooled by air.
Here the circulation of air take place due to density difference, which is caused by temperature
difference between solid plate and air.
•
Natural convection is the process of heat transfer which occurs due to movement of the fluid
particles by density change associated with temperature differential in a fluid.
•
Some Example are given below:
1. The cooling of electrical transformers and
rectifiers.
2. The heat transfer from hot pipes by cooled air .
• Forced convection is a type of transfer in which fluid motion is generated by an external
source (like a pump, fan, suction device, etc.)
• It is mostly used in all heat transfer application because the convection due to it, will be much higher
as compared to free convection.
• If a heated plate is kept under a fan for cooling, it is called as forced convection.
Page 5
CONTENT:
•
Basic Definitions
•
Natural And Force Convection
•
Factor Affecting convective Heat Transfer Coefficient
•
Nusselt Number And Prandlt Number
•
Dimensional Relationship of Natural Convection With Gr and Pr
BASICS DEFINIONS
1. Heat Transfer:
Heat Transfer Define As The Transmission of Energy From One Region to another Region
as a result of Temperature Gradient.
•
Conduction:
Conduction Transfer Heat via Direct Molecular Collision. Area of Greater kinetic energy will
Transfer Thermal energy to an area with lower kinetic energy.
•
Convection:
When a Fluid, such as air or Liquid, is heated and then travels away
from the source, it carries the thermal energy along. This type of Heat
Transfer is called convection.
•
Radiation:
Thermal Radiation Generates from the emission of electromagnetic
waves. These waves carry the energy away from the emitting object.
Natural And Force Convection
•
Natural Convection is a type of heat transfer, in which the fluid motion is not generated by
any external source (like a pump, fan, suction pump etc.) but only by density differences in the
fluid occurring due to temperature gradients.
•
The Example of free convection is a heated plate when kept in an atmosphere, it gets cooled by air.
Here the circulation of air take place due to density difference, which is caused by temperature
difference between solid plate and air.
•
Natural convection is the process of heat transfer which occurs due to movement of the fluid
particles by density change associated with temperature differential in a fluid.
•
Some Example are given below:
1. The cooling of electrical transformers and
rectifiers.
2. The heat transfer from hot pipes by cooled air .
• Forced convection is a type of transfer in which fluid motion is generated by an external
source (like a pump, fan, suction device, etc.)
• It is mostly used in all heat transfer application because the convection due to it, will be much higher
as compared to free convection.
• If a heated plate is kept under a fan for cooling, it is called as forced convection.
Factor Affecting convective Heat Transfer Coefficient
1. Temperature Difference (T)
T the greater the heat transfer rate.
2. Fluid flow rate
Increasing flow rate increasing heat transfer rate.
3. Surface area
the larger the surface area of conducting interfaces, the greater the heat
transfer rate.
Read MoreFAQs on PPT: Convection
| 1. What is convection? |  |
Convection is a process of heat transfer where heat is transferred through the movement of fluids, such as air or liquid. It occurs when warmer particles move from one place to another, carrying their heat energy with them.
| 2. How does convection work? | |
Convection works by the movement of fluids due to differences in temperature. When a fluid is heated, it becomes less dense and rises, creating a convection current. As the fluid cools down, it becomes denser and sinks, completing the cycle.
| 3. What are the different types of convection? | |
There are two main types of convection: natural convection and forced convection. Natural convection occurs when the fluid motion is caused by temperature differences alone, while forced convection involves an external force, such as a fan or pump, to move the fluid.
| 4. How is convection used in everyday life? | |
Convection is utilized in various ways in our daily lives. Some examples include the use of convection ovens for cooking, convection heaters for space heating, and convection currents in the atmosphere that contribute to weather patterns.
| 5. How is convection related to weather? | |
Convection plays a crucial role in weather phenomena such as thunderstorms and hurricanes. The unequal heating of the Earth's surface results in the formation of convection currents in the atmosphere, leading to the vertical movement of air masses and the development of severe weather conditions.
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Apr 12, 2026 Last updated
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