Effect of rib height on heat transfer in a two pass rectangular channel (AR = 1:4) with a sharp entrance at high rotation numbers

Michael Huh, Yao-Hsien Liu, Je Chin Han*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Blockage ratio effects on heat transfer in 1:4 AR channels with developing flow is experimentally determined. The blockage ratios (e/Dh) were 0.078 and 0.156. Reynolds numbers up to 40 K and rotational speeds up to 400 rpm were considered. The rotation number (Ro) and local buoyancy parameter (Box) were extended to 0.65 and 1.5, respectively. The entrance dominates over rotation on the trailing surface first pass. The leading surface is dominated by rotation. Rotation effects are reduced by the ribs and heat transfer is similar for both walls in the second pass. Rotation effects were similar for both blockage ratios. The correlations show that the buoyancy parameter is useful to predict heat transfer in the extended range.

Original languageEnglish
Pages (from-to)4635-4649
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume52
Issue number19-20
DOIs
StatePublished - 1 Sep 2009

Keywords

  • Buoyancy parameter
  • Heat transfer
  • Internal cooling
  • Rotating rectangular channel
  • Rotation number

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