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: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

18 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 re-directed sharp bend entrance and radially inward flow in the second passage after a 180° sharp turn. In the first passage, rotation effects on heat transfer are reduced by the re-directed 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 parameter study of the low rotation number (0-0.3) and low buoyancy parameter (0-0.2) achieved previously. By varying the Reynolds numbers (10000-40000) and the rotational speeds (0-400 rpm), the increased range of the rotation number and buoyancy parameter reached in this study are 0-0.67 and 0-1.9, 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
Title of host publicationProceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air
Number of pages11
StatePublished - 24 Sep 2007
Event2007 ASME Turbo Expo - Montreal, Que., Canada
Duration: 14 May 200717 May 2007

Publication series

NameProceedings of the ASME Turbo Expo
Volume4 PART A


Conference2007 ASME Turbo Expo
CityMontreal, Que.


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