Thermal Diffusivity Calculator

Your details

Selecting a preset fills k, density, and cp automatically. Choose "Custom" to enter your own values.
Choose which property to calculate; enter the other three.
Rate at which heat flows through the material per unit temperature gradient.
W/(m·K)
Mass per unit volume of the material.
kg/m³
Energy required to raise 1 kg of the material by 1 K.
J/(kg·K)
Unit in which thermal diffusivity is displayed.
Half-thickness or radius of the sample; used for Fourier number and response time.
m
Elapsed time used for penetration depth and Fourier number calculations.
s
Thermal diffusivity (alpha)High (light metals)
84.3621

How quickly a material conducts heat relative to its heat storage capacity.

Diffusivity unit labelmm²/s
Thermal conductivity (k)205W/(m·K)
Density (rho)2,700kg/m³
Specific heat (cp)900J/(kg·K)
Volumetric heat capacity2,430,000J/(m³·K)
Penetration depth0.1261m
Thermal response time0.38s
Fourier number (Fo)50.6173
Thermal diffusivity84.3621
Fourier number50.6173

Thermal diffusivity: 84.3621 mm²/s

  • Thermal diffusivity of aluminum is 84.3621 mm²/s.
  • After 60 s, a thermal wave has penetrated 126.10 mm into the sample.
  • A 10 mm slab takes approximately 0.4 s to thermally equilibrate.

Next stepFourier number (50.617) > 0.2: the body is close to thermal equilibrium - a lumped capacitance model is likely valid.

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