Transient temperature responses in biological materials under pulsed IR irradiation

Abstract

In this work, an experimental setup has been established to provide a second-pulsed IR irradiation as a heating source and corresponding measuring system of transient temperature responses for biological materials. The processed meat is selected as specimen. The temperature responses of the specimens are measured for various specimen thicknesses. Theoretically, the classical Fourier model for heterogeneous medium and the dual-phase-lagging model (DPL) (including the thermal wave situation) are employed to simulate the temperature responses of the specimens. By comparing with the experimental results, it is found that the temperature response has not shown a jump caused by thermal wave propagation as that appeared in the literature, but a wave-like shape predicted by the DPL model, which is almost the same as the numerical results from the Fourier model for heterogeneous medium. On basis of these results, the evaluating method of transient thermal response inside biological materials is discussed.