Question:
Which of the following is used to increase heat transfer from the surface?
Which of the following is used to increase heat transfer from the surface?
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Fins (extended surfaces) are used to increase the heat transfer rate from a solid boundary to a fluid by significantly expanding the effective surface area.
Updated On: Aug 7, 2026
- Fins
- Thermistors
- Alternators
- Emitters
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Convective heat transfer from a solid surface to a fluid can be increased by modifying the convection coefficient ($h$), the temperature difference ($\Delta T$), or the total surface area ($A$).
Extending the surface area is a practical engineering approach to increase heat transfer.
Step 2: Detailed Explanation:
From Newton's Law of Cooling, the rate of convective heat transfer is:
\[ Q = hA \Delta T \]
To increase $Q$ when $h$ and $\Delta T$ are fixed by system limitations, the heat transfer area ($A$) can be increased.
This is achieved by adding extended surfaces, commonly known as Fins, to the solid boundary.
Fins are thin metal protrusions that extend from the primary heat transfer surface into the surrounding fluid.
Heat conducts into the fins from the base and is then dissipated into the fluid over their larger surface area, increasing the overall heat transfer rate.
Fins are widely used on compressor cylinders, radiator tubes, and electronic heat sinks.
Thermistors are temperature sensors, alternators generate electrical power, and emitters are used in electronics or radiation sources, none of which are used to increase convective heat transfer.
Step 3: Final Answer
The correct option is (A).
Convective heat transfer from a solid surface to a fluid can be increased by modifying the convection coefficient ($h$), the temperature difference ($\Delta T$), or the total surface area ($A$).
Extending the surface area is a practical engineering approach to increase heat transfer.
Step 2: Detailed Explanation:
From Newton's Law of Cooling, the rate of convective heat transfer is:
\[ Q = hA \Delta T \]
To increase $Q$ when $h$ and $\Delta T$ are fixed by system limitations, the heat transfer area ($A$) can be increased.
This is achieved by adding extended surfaces, commonly known as Fins, to the solid boundary.
Fins are thin metal protrusions that extend from the primary heat transfer surface into the surrounding fluid.
Heat conducts into the fins from the base and is then dissipated into the fluid over their larger surface area, increasing the overall heat transfer rate.
Fins are widely used on compressor cylinders, radiator tubes, and electronic heat sinks.
Thermistors are temperature sensors, alternators generate electrical power, and emitters are used in electronics or radiation sources, none of which are used to increase convective heat transfer.
Step 3: Final Answer
The correct option is (A).
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