Chaotic oscillations of forced convection in tightly coiled ducts

Fang Liu, Liqiu Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


The present work is on the stability of forced convection in a tightly coiled square duct of curvature ratio 0.5 in high Dean number region. Dynamic responses of multiple flows to finite random disturbances are examined by direct transient computation. It is found that physical realizable, fully developed flows evolve to chaotic oscillations at high values of Dean number. The power spectrum of these oscillating flows is constructed by empirical mode decomposition and Hilbert spectral analysis for the characteristics of chaotic oscillations. With increase of the Dean number, the temporal scale of chaotic oscillation becomes wider; high-frequency flows appear, and the energy contained in the bursts becomes stronger.

Original languageEnglish
Pages (from-to)179-194
Number of pages16
JournalNumerical Heat Transfer; Part A: Applications
Issue number2
Publication statusPublished - 1 Nov 2007
Externally publishedYes

ASJC Scopus subject areas

  • Numerical Analysis
  • Condensed Matter Physics


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