In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by__________________?
Correct answer: C. Radiation
- A. Conduction
- B. Convection
- C. Radiation
- D. Cannot be predicted
Explanation
At about 1250°C, the radiative heat-transfer rate is dominant because it varies approximately with the fourth power of absolute temperature. Conduction and convection still occur, but their contribution is comparatively smaller.
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