Computational analysis of heat rectification in composition-graded systems: From macro-to-nanoscale

I. Carlomagno, V. A. Cimmelli, D. Jou

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

© 2015 Elsevier B.V. All rights reserved. The heat rectification coefficient of a composition-graded system of the type AxB1-x, with A and B being theoretical materials, and composition x changing along the length of the system, is considered. By starting from a mathematical model for the thermal conductivity of the material λ in terms of temperature T and composition x, the influence of composition spatial distribution, heat flux, length of the system, and minimum of λ(T,x) on the rectification coefficient is explored. In some circumstances, a reversal in the direction of the rectification is observed for increasing heat flux.
Original languageEnglish
Pages (from-to)244-251
JournalPhysica B: Condensed Matter
Volume481
DOIs
Publication statusPublished - 15 Jan 2016

Keywords

  • Direct heat flux
  • Graded systems
  • Heat rectification
  • Size effects in nanosystems

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