HEAT-TRANSFER DURING ASYMMETRICAL COLLISION OF THERMAL WAVES IN A THIN-FILM

Wave nature of heat propagation in a thin film subjected to an asymmet rical temperature change on both sides is investigated by solving the hyperbolic heat conduction equation. Analytical expressions for the te mperature and heat Aux distributions and numerical results for the tim e history of heat transfer behavior are obtained. It is disclosed that in transient heat conduction, a heat pulse is transported as a wave, which is attenuated in the film, and that non-Fourier heat conduction is extremely significant within a certain range of film thickness and time. When a film with smaller value of x(0)/(tau C) is heated on both side walls, temperature overshoot occurs within a very short period o f time. (C) 1997 Elsevier Science Ltd.