Notable physical anomalies manifested in non-Fourier heat conduction under the dual-phase-lag model

B. Shen, P. Zhang

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

In this study, a number of notable physical anomalies concerning non-Fourier heat conduction under the dual-phase-lag (DPL) model are observed and investigated. It is found that, during the transient heat transfer process, the over-diffusion mode predicts a "hyper-active" to "under-active" transition in thermal behavior. The main cause behind it lies in the time-varying effect of τT (the phase lag of the temperature gradient) on the thermal response. Also, change of polarity in reflected thermal waves can be observed when a constant-temperature boundary is involved, which hints that a heating process may be followed by a spontaneous cooling effect. A fairly strong connection is present between the τT-induced dispersive effect and an unusual thermal accumulation phenomenon in an on-off periodic heating process. Furthermore, a paradox involving a moving medium is detected in the DPL model, which can be solved by replacing the temporal partial derivatives in the DPL equation with the material derivatives. During the process of analysis, a high-order characteristics-based TVD scheme is relied on to provide accurate and reliable numerical simulations to the DPL heat conduction equation under various initial-boundary conditions.

Original languageEnglish
Pages (from-to)1713-1727
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume51
Issue number7-8
DOIs
Publication statusPublished - Apr 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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