A Study of the Heat Conduction Phenomena with a Phase Lag of Heat Flux

열유속 상지연이 존재하는 열전도 현상에 대한 연구

  • 김창복 (한국해양대학교, 기관시스템공학부) ;
  • 김경근 (한국해양대학교, 기관시스템공학부) ;
  • 정한식 (경상대학교, 해양과학대학, 정밀기계공학과) ;
  • 정효민 (경상대학교, 해양과학대학, 정밀기계공학과) ;
  • 최두열 (경상대학교, 대학원) ;
  • 최순호 (경상대학교 친환경에너지기계연구사업팀)
  • Published : 2008.07.31


In most engineering applications related with the heat conduction phenomena, a conventional Fourier heat conduction equation has been successfully applied and it has supplied quite reasonable results. However, it is well known that the Fourier heat conduction equation is failed in the application to the extremely small space and short time, in other words, a nano-scale system and a pico-second time. In this study, non-Fourier effect was evaluated in the heat conduction by considering the concept of a phase lag model. The results show the existence of a heat wave, which means that the heat is transferred with a finite speed while an infinite speed of heat transfer is assumed in the conventional Fourier heat conduction. In addition, the copper and the gold are tested to evaluate the phase lag time between the heat flux and the temperature gradient. The results show that the gold has the heat wave speed faster than that of the copper consistent with the prediction based on an actual experiment.



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