The determination of the thermal properties of a heat conductor in a nonlinear heat conduction problem

Abstract.

This paper considers the inverse determination of the positive unknown thermal properties K(T), C(T) and the unknown temperature T( _{x, t} ) in the nonlinear transient heat conduction equation. In addition to prescribed initial and/or boundary values, specified continuously differentiable temperature data T(x ₀, t) with non-zero derivative at a single sensor location x = x ₀ is given. When K(T) and C(T) obey a certain relationship which enables one to linearise exactly the nonlinear heat equation then their dependence upon T is obtained explicitly, whilst the unknown temperature T(x, t) is obtained implicitly and is then calculated numerically. Results are presented and discussed for infinite, semi-infinite and finite slabs.