Forced convection is forced [man-made] and normal convection is natural.
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Normal convection occurs naturally due to temperature differences, while forced convection is induced by external means such as fans or pumps. Forced convection typically has higher heat transfer rates compared to natural convection due to the enhanced fluid motion generated by the external force.
Heat vents are an example of forced convection. Forced convection occurs when a fluid motion is caused by an external source such as a fan or pump, as opposed to natural convection, which occurs due to density differences in the fluid. In the case of heat vents, the air is circulated by a fan to distribute the warm air throughout a room.
Two types of convection are natural convection and forced convection. Natural convection occurs due to density differences in a fluid caused by temperature variations, leading to fluid motion. Forced convection, on the other hand, involves the use of an external force, such as a fan or pump, to enhance fluid motion and heat transfer.
Condensation of water vapor directly into ice without passing through the liquid phase is a step that is not part of a normal convection cycle.
In a forced-air heating system, a blower motor pushes warm air produced by a furnace through ductwork to different rooms in a building. As the warm air rises, cooler air is drawn into the ducts to be heated, creating a continuous circulation of air by convection. This method efficiently and evenly distributes heat throughout the space.
Cooked air rises creating a high pressure system below