The Validity of Using the Microscopic Hyperbolic Heat Conduction Model Under a Harmonic Fluctuating Boundary Heating Source

The validity of using the microscopic hyperbolic heat conduction model under a harmonic fluctuating boundary heating source is investigated. It is found that using the microscopic hyperbolic heat conduction model is essential when w¯Cl G > 0.1. The phase shift between the electron-gas and solid-lattice temperatures is found to be tan−1(w¯Cl G ). This phase shift reaches a fixed value of 1.5708 rad at very large values of w¯Cl G . It is found that the use of the microscopic hyperbolic heat conduction model is essential when w¯ > 1×109 rad · s−1 for most metallic layers independent of their thickness.