High rotation number effects on heat transfer in a rectangular (AR=2:1) two pass channel

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

*Corresponding author for this work

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

13 Scopus citations


This paper experimentally investigated the rotational effects on heat transfer in a smooth two-pass rectangular channel (AR=2:1), which is applicable to the cooling passages in the mid portion of the gas turbine blade. The test channel has radially outward flow in the first passage and radially inward flow in the second passage after a 180° sharp turn. In the first passage, the flow is developing and heat transfer is increased compared to the fully developed case. Rotation slightly reduces the heat transfer on the leading surface and increases heat transfer on the trailing surface in the first pass. Heat transfer is highly increased by rotation in the turn portion of the first pass on both leading and trailing surfaces. Rotation increased heat transfer enhancement in the tip region up to a maximum Nu ratio (Nu/Nus) of 1.83. In the second passage, under rotating conditions, the leading surface experienced heat transfer enhancements above the stationary case while the trailing surface decreased. The current study has more than 4 times the range of the rotation number previously achieved for the 2:1 aspect ratio channel. The increased range of the rotation number and buoyancy parameter reached in this study are 0-0.45 and 0-0.8, respectively. The higher rotation number and buoyancy parameter have been correlated very well to predict the rotational heat transfer in the two-pass, 2:1 aspect ratio flow channel.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2009
Subtitle of host publicationPower for Land, Sea and Air
Number of pages12
EditionPART A
StatePublished - 1 Dec 2009
Event2009 ASME Turbo Expo - Orlando, FL, United States
Duration: 8 Jun 200912 Jun 2009

Publication series

NameProceedings of the ASME Turbo Expo
NumberPART A


Conference2009 ASME Turbo Expo
Country/TerritoryUnited States
CityOrlando, FL


Dive into the research topics of 'High rotation number effects on heat transfer in a rectangular (AR=2:1) two pass channel'. Together they form a unique fingerprint.

Cite this