Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

Shyy Woei Chang, Tong Miin Liou, Ming Hsin Lu

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56 Citations (Scopus)


An experimental study of heat transfer and pressure drop in a rectangular channel roughened by scaled surfaces on two opposite walls with flows directed in the forward and downward directions for Reynolds numbers (Re) in the range of 1500 ≤ Re ≤ 15,000 was performed. Nusselt number ratios between the scale-roughened and smooth-walled ducted flows (Nu/Nu) were in the range of 7.4-9.2 and 6.2-7.4 for laminar forward and downward flows respectively. The Nu/Nu values for turbulent developed flows in the scale-roughened channel with forward and downward flows were about 4.5 and 3 respectively. A comparison of present data with reported results using different types of surface roughness demonstrated the better thermal performances of present scale-roughened channel with forward flow at conditions of Re > 10,000. Experimental correlations of heat transfer and friction coefficient were derived for the present scale-roughened rectangular channel.

Original languageEnglish
Pages (from-to)3921-3931
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Issue number19-20
Publication statusPublished - 2005 Sep 1

All Science Journal Classification (ASJC) codes

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


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