Why is convection faster than conduction

Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling. What causes convection? Convection currents are the result of differential heating. Lighter less dense , warm material rises while heavier more dense cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth. What are the two types of convection?

There are two types of convection: natural convection and forced convection. Natural convection is produced by density differences in a fluid due to temperature differences e. Global atmospheric circulation and local weather phenomena including wind are due to convective heat transfer. What are the 3 types of heat? The three types of heat transfer Convection. What is meant by forced convection?

Forced convection is a mechanism, or type of transport in which fluid motion is generated by an external source like a pump, fan, suction device, etc.

What are the convection currents? A convection current is a process which involves the movement of energy from one place to another. Although conduction was at work in both cases, it transferred much less heat than convection. YouTube Video. Beaker A. However, the heat transfer only works in one direction. You cannot cool an object by radiation, as you can with conduction or convection.

Electric heaters use radiation to heat an area. If a fan is added, the device uses both radiation and convection to heat the area. Transfer of heat by radiation travels at the speed of light and goes great distances, even in a vacuum. We are heated from the Sun through radiation transfer of heat.

Thermal energy can be transferred from one end of a material to the other or from one material to another through conduction.

It is also transferred indirectly by convection and radiation. Atoms or molecules transfer kinetic energy to their neighbors through collisions. When objects are in contact this transfers heat by conduction. Liquids and gases can move high or low energy molecules to another region through convection.

The process of convection occurs when groups of molecules are displaced to the vicinity of slower or faster molecules and mix with them. Forced convection occurs when hotter or cooler parts of a fluid are moved by way of forces other than gravity, such as a pump.