What is meant by free convection?

Natural convection, also known as free convection, is a mechanism, or type of mass and heat transport, in which the fluid motion is generated only by density differences in the fluid occurring due to temperature gradients, not by any external source (like a pump, fan, suction device, etc.).

How is heat transferred through free or natural convection?

In free or natural convection, the flow is driven by buoyant forces: hot fluid rises and cold fluid sinks because density decreases as temperature increases. The house in (Figure) is kept warm by natural convection, as is the pot of water on the stove in (Figure).

What is an example of free convection?

The cycling movement of boiling water in a pot is an example of natural convection. Warm water at the bottom of the pot expands, rises to the top of the pot, cools down, and falls within the same pot.

What is the difference between forced and free convection?

In free convection, the molecules move due to density and temperature variation. In forced convection, the fluid molecules are forced to move by an external source. The rate of heat transfer is lower. The rate of heat transfer is higher.

What is meant by free or natural convection & forced convection?

In natural convection, any fluid motion is caused by natural means such as the buoyancy effect, i.e. the rise of warmer fluid and fall the cooler fluid. Whereas in forced convection, the fluid is forced to flow over a surface or in a tube by external means such as a pump or fan.

What is an example of natural convection?

One of the most common examples of natural convection is the phenomena of the sea and land breeze. Sea breeze: This phenomenon occurs during the day. The sun heats up both the sea surface and land.

Which is the best example of heat transfer by convection?

Which of the following is an example of heat being transferred by convection? In an investigation, water in an Erlenmeyer flask is placed on a hot plate. As the water is heated, the cooler, denser water at the surface sinks and pushes the warmer water to the top.

What are the examples of heat transfer by convection?

Everyday Examples of Convection radiator – A radiator puts warm air out at the top and draws in cooler air at the bottom. steaming cup of hot tea – The steam you see when drinking a cup of hot tea indicates that heat is being transferred into the air. ice melting – Ice melts because heat moves to the ice from the air.

What is the difference between free and forced vibration?

In free vibration, energy will remain the same. Energy is not added or removed from the body. The body keeps vibrating at the same amplitude. In forced vibration energy gets added to the vibrating body.

What are two types of convection?

There are two types of convection: natural convection and forced convection.