The temperature profile in a steel plate of thickness δ = 60 mm and constant thermal diffusivity a = 12.6 · 10 −6 m 2 /s, at a fixed time t 0 is given by with B(t 0 )=0.850. Here x + = x/δ; ϑ 1 = 100...

The temperature profile in a steel plate of thickness δ = 60 mm and constant thermal diffusivity a = 12.6 · 10⁻⁶
m²/s, at a fixed time t₀
is given by

with B(t₀)=0.850. Here x⁺
= x/δ; ϑ₁
= 100 ◦C and ϑ₂
= 250 ◦C are the constant surface temperatures of the plate at x⁺
= 0 and x⁺
= 1.