Thermal diffusivity is the most important in heat transfer by__________________?
Correct answer: A. Conduction
- A. Conduction
- B. Radiation
- C. Condensation
- D. Natural convection
Explanation
Thermal diffusivity, α = k/(ρCp), governs the penetration of temperature changes into a material and is central to heat conduction, especially transient conduction. Radiation does not depend on thermal diffusivity, and convection is primarily described using fluid-flow and boundary-layer parameters.
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