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FAQs on Radiation, Heat Transfer - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering
| 1. What is radiation heat transfer? |  |
Ans. Radiation heat transfer is the transfer of heat energy through electromagnetic waves. Unlike conduction and convection, which require a medium to transfer heat, radiation can occur in a vacuum and does not require direct contact between objects. It is the primary method of heat transfer from the Sun to the Earth.
| 2. How does radiation heat transfer work? | |
Ans. Radiation heat transfer occurs when an object emits electromagnetic waves in the form of infrared radiation. These waves carry thermal energy and can be absorbed by other objects, leading to an increase in their temperature. The amount of heat transferred through radiation depends on factors such as the emissivity and surface area of the objects involved.
| 3. What are some examples of radiation heat transfer? | |
Ans. Some examples of radiation heat transfer include the warming of the Earth's surface by the Sun, the heat emitted by a glowing charcoal fire, and the heat received from a hot stove or oven. Infrared radiation is also used in various technologies such as thermal imaging cameras and infrared heaters.
| 4. How does radiation heat transfer differ from conduction and convection? | |
Ans. Radiation heat transfer differs from conduction and convection in several ways. Unlike conduction, which involves direct contact between objects, radiation can occur even in the absence of a medium. Additionally, radiation does not require the movement of particles like convection does. Furthermore, while conduction and convection depend on temperature gradients, radiation can occur between objects at different temperatures.
| 5. What factors affect the rate of radiation heat transfer? | |
Ans. The rate of radiation heat transfer is influenced by factors such as the temperature difference between objects, the emissivity of the surfaces involved, and the surface area of the objects. Higher temperature differences and larger surface areas generally result in greater heat transfer through radiation. Objects with higher emissivity also tend to radiate heat more efficiently.
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