Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

THERMAL WAVE CHARACTERISTICS IN A FINITE MEDIUM

Get access (open in a dialog) DOI: 10.1615/IHTC11.670
pages 21-26

Abstrakt

Fourier's law of heat conduction has been applied in solving conduction problems encountered in practice. This law predicts instantaneous heat diffusion with infinite propagation speed. Some recent experiments show the reflections of thermal waves at the interface of dissimilar materials at cryogenic temperature. In situations involving transient heat flow in very short time or at cryogenic temperature, the effects of finite speed of heat propagation become important. The thermal wave characteristics of damping and resonance are derived from the thermal wave 'equation through both modified heat flux equation and energy conservation law. The thermal resonance and phase lags of heat flux in a finite medium with thermal relaxation time are studied in this work by Finite Fourier transform with respect to space. As the result of the transformation with respect to space, the resonance and phase lags on underdamped condition are found when the modal frequencies in the medium exceed a critical value. The relationship between the modal frequencies to occur a resonance and the resonance frequencies is obtained.