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Conduction Through Composite Wall Heat Transfer HMT Tutorial- 14, Heat and Mass Transfer, Mechanical Engineering, GATE Video Lecture | Topper Handwritten Notes & Videos for GATE ME

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FAQs on Conduction Through Composite Wall Heat Transfer HMT Tutorial- 14, Heat and Mass Transfer, Mechanical Engineering, GATE Video Lecture - Topper Handwritten Notes & Videos for GATE ME

1. What is conduction and how does it contribute to heat transfer?
Ans. Conduction is a mode of heat transfer where heat is transferred through a solid material without any bulk movement of the material itself. It occurs due to the collision of molecules within the material. When there is a temperature gradient in a solid, the higher energy molecules collide with the lower energy molecules, transferring heat in the process. Conduction is an important mechanism of heat transfer in solids.
2. What is a composite wall and how does it affect heat transfer?
Ans. A composite wall is a wall made up of multiple layers of different materials with varying thermal conductivities. Each layer in the wall has a different resistance to heat transfer, and this affects the overall heat transfer through the wall. The thermal conductivity of each layer determines how easily heat can pass through it. The presence of multiple layers with different thermal conductivities in a composite wall can significantly impact the overall heat transfer rate.
3. How does the thickness of a composite wall affect heat transfer?
Ans. The thickness of a composite wall plays a crucial role in determining the heat transfer rate. A thicker wall generally offers higher resistance to heat transfer, resulting in a slower transfer of heat. This is because a thicker wall provides a longer path for heat to flow through, increasing the thermal resistance. Therefore, increasing the thickness of a composite wall would decrease the heat transfer rate, while reducing the thickness would enhance the heat transfer.
4. What is the difference between heat transfer and mass transfer?
Ans. Heat transfer and mass transfer are both mechanisms of transferring energy, but they involve different properties. Heat transfer involves the transfer of thermal energy from a region of higher temperature to a region of lower temperature. On the other hand, mass transfer involves the transfer of mass or material from one place to another, typically driven by a concentration gradient. While heat transfer deals with the transfer of energy, mass transfer deals with the transfer of matter.
5. How does conduction through a composite wall affect the overall heat transfer rate?
Ans. Conduction through a composite wall affects the overall heat transfer rate by introducing different thermal resistances in the path of heat flow. Each layer in the composite wall has its own thermal conductivity and thickness, which contribute to the overall resistance to heat transfer. The heat transfer rate through the composite wall depends on the combination of thermal conductivities and thicknesses of the individual layers. A higher thermal conductivity or thinner layer will facilitate faster heat transfer, while a lower thermal conductivity or thicker layer will hinder heat transfer.
59 videos|196 docs
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