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Heat Transfer Between Two Non Black Bodies (GATE Questions with solution), Heat and Mass Transfer Video Lecture | Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering
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FAQs on Heat Transfer Between Two Non Black Bodies (GATE Questions with solution), Heat and Mass Transfer Video Lecture - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering
| 1. What is heat transfer and how does it occur between two non-black bodies? |  |
Ans. Heat transfer is the process of energy exchange between two or more objects or systems due to temperature difference. When two non-black bodies are in thermal contact, heat transfer can occur through three modes: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between particles of matter, convection is the transfer of heat through the movement of fluid, and radiation is the transfer of heat through electromagnetic waves.
| 2. How does the heat transfer process differ between black bodies and non-black bodies? | |
Ans. Black bodies are idealized objects that absorb and emit all incoming radiation, making them efficient heat transfer devices. On the other hand, non-black bodies absorb and emit only a fraction of the incoming radiation, which affects the heat transfer process. Non-black bodies have a property called emissivity, which determines their ability to radiate heat. The lower the emissivity, the less efficient the heat transfer process becomes.
| 3. Can you explain the concept of emissivity and its role in heat transfer between non-black bodies? | |
Ans. Emissivity is a measure of an object's ability to radiate heat compared to an ideal black body. It is represented by a value between 0 and 1, with 1 being a perfect emitter of radiation. Non-black bodies have emissivity values less than 1, indicating that they radiate heat less efficiently. The emissivity value determines the amount of heat that can be transferred through radiation between two non-black bodies. Higher emissivity values mean more efficient heat transfer.
| 4. How does conduction contribute to heat transfer between two non-black bodies? | |
Ans. Conduction is the transfer of heat through direct contact between particles of matter. In the case of two non-black bodies, heat transfer through conduction occurs when they are in physical contact with each other. The particles at the interface of the bodies transfer energy through collisions, leading to an exchange of heat. The rate of conduction depends on the thermal conductivity of the materials and the temperature difference between the bodies.
| 5. What factors affect the rate of heat transfer between two non-black bodies? | |
Ans. Several factors influence the rate of heat transfer between two non-black bodies. These include the temperature difference between the bodies, the surface area in contact, the thermal conductivity of the materials, the emissivity of the bodies, and the presence of any insulating layers or mediums between them. The larger the temperature difference and surface area, the higher the rate of heat transfer. Higher thermal conductivity and emissivity values also enhance heat transfer, while insulating layers decrease it.
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