Question

For the fins arrangement, when the other conditions are remaining same, to get better effectiveness the fins should be

• A. Thick and closely spaced
• B. Thick and widely spaced
• C. Thin and closely spaced
• D. Thin and widely spaced

Hint:

For effective heat dissipation, use thin and closely spaced fins. This ensures more surface area for heat exchange and minimizes thermal resistance, leading to better heat transfer.

Answer 1

The Correct Option is C

Step 1: Understanding the role of fins in heat transfer
The purpose of fins is to increase the surface area for heat dissipation. The effectiveness of fins depends on factors such as the thickness and spacing of the fins.
Step 2: Effect of thickness on effectiveness
Thin fins are generally preferred as they offer a larger surface area relative to their mass, improving heat transfer. Thicker fins, while they can conduct more heat, reduce the effective heat transfer rate due to their larger mass.
Step 3: Effect of spacing on effectiveness
Fins that are closely spaced allow for better utilization of surface area for heat dissipation. Although wider spacing can improve airflow, too much spacing reduces the effective heat exchange due to less surface area per unit of volume.
Step 4: Conclusion
To achieve better heat transfer effectiveness, fins should be thin and closely spaced. This configuration maximizes surface area and improves heat transfer efficiency, especially when the airflow is not overly restricted.