Question

In the furnace with heating element temperature at 1700$^{\circ}$C, the dominant mechanism of heat transfer will be}

• A. Conduction
• B. Radiation
• C. Natural convection
• D. Forced convection

Hint:

High Heat = Radiation. Once temperatures exceed approximately 600$^{\circ}$C, radiation starts to take over from other modes.

Answer 1

The Correct Option is B

Step 1: Concept There are three modes of heat transfer: conduction, convection, and radiation.

Step 2: Meaning Radiative heat transfer is governed by the Stefan-Boltzmann law, which states that heat flux is proportional to the fourth power of absolute temperature ($T^{4}$).

Step 3: Analysis Conduction and convection typically increase linearly with temperature differences. At very high temperatures, such as 1700$^{\circ}$C, the $T^{4}$ relationship causes radiation to grow exponentially.

Step 4: Conclusion Therefore, at high metallurgical temperatures, radiation becomes the vastly dominant mechanism of heat transfer. Final Answer: (B)