Heat transfer in a two-pass rectangular channel (AR=1:4) under high rotation numbers

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


This paper experimentally investigated the rotational effects on heat transfer in a two-pass rectangular channel (AR = 1:4), which is applicable to the channel near the leading edge of the gas turbine blade. The test channel has radially outward flow in the first passage through a redirected sharp-bend entrance and radially inward flow in the second passage after a 180 deg sharp turn. In the first passage, rotation effects on heat transfer are reduced by the redirected sharp-bend entrance. In the second passage, under rotating conditions, both leading and trailing surfaces experienced heat transfer enhancements above the stationary case. Rotation greatly increased heat transfer enhancement in the tip region up to a maximum Nu ratio (Nu/ Nus) of 2.4. The objective of the current study is to perform an extended parametric study of the low rotation number (0-0.3) and low buoyancy parameter (0-0.2) achieved previously. By varying the Reynolds numbers (10,000-40,000), the rotational speeds (0-400 rpm), and the density ratios (inlet density ratio =0.10-0.16), the increased range of the rotation number and buoyancy parameter reached in this study are 0-0.67 and 0-2.0, respectively. The higher rotation number and buoyancy parameter have been correlated very well to predict the rotational heat transfer in the two-pass, 1:4 aspect ratio flow channel.

Original languageEnglish
Article number081701
JournalJournal of Heat Transfer
Issue number8
StatePublished - 1 Aug 2008


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


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