Thermal performance of undulant narrow channel with skewed sinusoidal wall-waves and 45°ribs

Shyy-Woei Chang, Bo Jyun Huang

Research output: Contribution to journalArticle

3 Citations (Scopus)


This experimental study examines the properties of heat transfer, pressure drop and thermal performance factor (TPF) of a narrow undulant channel enhanced by skew sinusoidal wall-waves and 45°ribs. Detailed Nusselt number (Nu) distributions over the wavy ribbed channel wall are generated by the steady-state infrared thermography method and examined along with the accompanying pressure drop coefficient (f) in the test Reynolds number (Re) range of 800-9000. With references to the Nusselt numbers (Nu ) and pressure drop coefficients (f ) of smooth plain tube, the area-averaged heat transfer enhancement (HTE) ratios, pressure drop augmentations (f/f ) and TPF for the tested undulant channel are compared with those obtained from other passive HTE devices. Empirical correlations evaluating the area-averaged Nusselt number (Nu) over the undulant ribbed channel wall and the pressure drop coefficients are generated to assist design activities using this newly devised HTE measure.

Original languageEnglish
Pages (from-to)3167-3177
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Issue number11-12
Publication statusPublished - 2012 May 1

All Science Journal Classification (ASJC) codes

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

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