Thermal Diffusivity

1. Thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure.
2. Thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure.

Thermal diffusivity measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. High diffusivity means heat transfers rapidly. It was found that the thermal diffusivity decreased with an increasing temperature, wet materials had a higher thermal diffusivity, and the thermal diffusivity was a minimum at the α−β transition. For example, the thermal diffusivity for both Barre granite and St. Cloud granite decreased from about 14×103 cm2/s at 10°C to 7×103 cm2/s at 573°C (the α−β transition). From 573 to 700°C the thermal diffusivity slightly increased with increasing temperature.

Sources:

MacMillan Dictionary https://www.macmillandictionary.com/dictionary/british

Twi-global https://www.twi-global.com/technical-knowledge/

Zong-Xian Zhang Effect of Temperature on Rock Fracture // Rock Fracture and Blasting Theory and Applications, 2016, https://www.sciencedirect.com/science/article/pii/B9780128026885000051