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Heat Transfer by Prof Sunando Dasgupta Video Lecture | Crash Course for GATE Chemical Engineering
FAQs on Heat Transfer by Prof Sunando Dasgupta Video Lecture - Crash Course for GATE Chemical Engineering
| 1. What are the different modes of heat transfer? |  |
Ans. The three primary modes of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through a solid material without any movement of the material itself, typically occurring in solids. Convection involves the transfer of heat through the movement of fluids (liquids or gases) and can be natural or forced. Radiation is the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum and does not require a medium.
| 2. How does the heat transfer coefficient affect heat exchanger design? | |
Ans. The heat transfer coefficient is a critical parameter in heat exchanger design, as it quantifies the heat transfer rate between the fluid and the surface. A higher heat transfer coefficient indicates more efficient heat transfer, leading to better performance of the heat exchanger. Engineers must consider this coefficient when selecting materials, designing flow arrangements, and optimizing the size and surface area of the heat exchanger to ensure effective thermal management.
| 3. What is the significance of the thermal conductivity of materials in heat transfer? | |
Ans. Thermal conductivity is a material property that indicates how well a material can conduct heat. It plays a significant role in heat transfer as materials with high thermal conductivity can transfer heat more efficiently, making them suitable for applications such as thermal insulation or heat sinks. Understanding thermal conductivity helps engineers select appropriate materials for various applications to optimize energy efficiency and performance.
| 4. What factors influence convective heat transfer in fluids? | |
Ans. Several factors influence convective heat transfer, including fluid velocity, temperature difference between the surface and the fluid, fluid properties (like viscosity and density), and the nature of the fluid flow (laminar or turbulent). Higher fluid velocity enhances convective heat transfer due to increased turbulence, while larger temperature differences lead to increased heat transfer rates. Understanding these factors allows for better thermal system design.
| 5. How can thermal radiation be quantified in engineering applications? | |
Ans. Thermal radiation can be quantified using the Stefan-Boltzmann law, which states that the total energy radiated per unit surface area of a black body is proportional to the fourth power of its absolute temperature (T^4). In engineering applications, emissivity of surfaces must also be considered, which measures how effectively a surface emits thermal radiation compared to a perfect black body. This quantification is crucial for designing systems involving heat exchange via radiation, such as furnaces or heat shields.
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