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Thermal conductivity HMT Tutorial- 5, Heat and Mass Transfer, Mechanical Engineering, GATE Video Lecture | Topper Handwritten Notes & Videos for GATE ME

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FAQs on Thermal conductivity HMT Tutorial- 5, Heat and Mass Transfer, Mechanical Engineering, GATE Video Lecture - Topper Handwritten Notes & Videos for GATE ME

1. What is thermal conductivity?
Ans. Thermal conductivity is the property of a material to conduct heat. It is a measure of how quickly heat can pass through a material. Materials with high thermal conductivity allow heat to flow easily, while materials with low thermal conductivity do not allow heat to pass through quickly.
2. How is thermal conductivity measured?
Ans. Thermal conductivity is typically measured using a device called a thermal conductivity meter or a heat flow meter. These devices measure the heat transfer through a material and calculate the thermal conductivity based on the temperature difference, the thickness of the material, and the area of heat transfer.
3. What factors affect the thermal conductivity of a material?
Ans. The thermal conductivity of a material is influenced by several factors, including the material's composition, structure, and temperature. Generally, materials with higher densities, greater atomic or molecular bonding, and lower porosity tend to have higher thermal conductivity. Additionally, an increase in temperature usually leads to an increase in thermal conductivity.
4. How does thermal conductivity impact heat transfer in engineering applications?
Ans. Thermal conductivity plays a crucial role in heat transfer in various engineering applications. It determines how efficiently heat can be transferred between different components or surfaces. For example, in heat exchangers, materials with high thermal conductivity are used to facilitate efficient heat transfer between a hot fluid and a cold fluid. In insulation, materials with low thermal conductivity are utilized to minimize heat transfer and maintain temperature control.
5. What are some common materials with high thermal conductivity?
Ans. Some common materials with high thermal conductivity include metals such as copper, aluminum, and silver. These metals are frequently used in heat sinks, electrical cables, and cooking utensils due to their excellent heat transfer properties. Other materials like diamond, graphite, and some ceramics also exhibit high thermal conductivity.
59 videos|196 docs
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