Which of the following is NOT an example of forced convection?
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A.
Forced-air heating systems
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B.
Human circulatory system
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C.
Cooling system of an automobile engine
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D.
Heating up of ground more quickly than large bodies of water
Correct Answer:
D. Heating up of ground more quickly than large bodies of water
Explanation:
Forced convection is a heat transfer mechanism where fluid motion is generated by an external source, such as a pump, fan, or blower, to increase the rate of heat exchange. Examples include forced-air heating systems, the human circulatory system (where the heart acts as a pump), and automobile cooling systems.
In contrast, natural convection occurs spontaneously due to buoyancy forces caused by density differences in a fluid. The heating of the ground more quickly than large bodies of water is an example of natural convection. As the air over the land warms, it becomes less dense and rises, allowing cooler, denser air from the water to move in and take its place, creating a sea breeze. Therefore, this phenomenon does not rely on an external mechanical device and is not an example of forced convection.
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