Compute thermal diffusivity α = k/(ρ·c) from conductivity, density and specific heat, describing how fast temperature changes propagate.
输入导热系数 k、密度 ρ、比热容 c,求热扩散率。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Thermal diffusivity | alpha = k / ( rho · c_p ), with k conductivity, rho density and c_p specific heat | ISO 80000-5:2019, Quantities and units - Part 5: Thermodynamics |
| Physical meaning | Thermal diffusivity measures how fast a material equalises temperature | ISO 80000-5:2019, Quantities and units - Part 5: Thermodynamics |
| Units | The unit of thermal diffusivity is m^2/s | ISO 80000-5:2019, Quantities and units - Part 5: Thermodynamics |
| Conductivity versus diffusivity | High conductivity alone does not mean fast heating; heat storage ρ·c_p matters too | Incropera FP, DeWitt DP, Fundamentals of Heat and Mass Transfer, Wiley |