Effect of RIB spacing 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, Sanjay Chopra

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

The focus of the current study was to determine the effects of rib spacing on heat transfer in rotating 1:4 AR channels. In the current study, heat transfer experiments were performed in a two-pass, 1:4 aspect ratio channel, with a sharp bend entrance. The channel leading and trailing walls in the first pass and second pass utilized angled rib turbulators (45° to the mainstream flow). The rib height-to-hydraulic diameter ratio (e/Dh) was held constant at 0.078. The channel was oriented 90° to the direction of rotation. Three rib pitch-to-rib height ratios (P/e) were studied: P/e = 2.5, 5, and 10. Each ratio was tested at five Reynolds numbers: 10K, 15K, 20K, 30K and 40K. For each Reynolds number, experiments were conducted at five rotational speeds: 0, 100, 200, 300, and 400 rpm. Results showed that the sharp bend entrance has a significant effect on the first pass heat transfer enhancement. In the second pass, the rib spacing and rotation effect are reduced. The P/e=10 case had the highest heat transfer enhancement based on total area, whereas the P/e=2.5 had the highest heat transfer enhancement based on the projected area. The current study has extended the range of the rotation number (Ro) and local buoyancy parameter (Box) for a ribbed 1:4 aspect ratio channel up to 0.65 and 1.5, respectively. Correlations for predicting heat transfer enhancement, due to rotation, in the ribbed (P/e=2.5, 5, and 10) 1:4 aspect ratio channel, based on the extended range of the rotation number and buoyancy parameter, are presented in the paper.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Turbo Expo
Subtitle of host publicationPower for Land, Sea, and Air
Pages287-300
Number of pages14
EditionPART A
DOIs
StatePublished - 1 Dec 2008
Event2008 ASME Turbo Expo - 2008 ASME Turbo Expo, Germany
Duration: 9 Jun 200813 Jun 2008

Publication series

NameProceedings of the ASME Turbo Expo
NumberPART A
Volume4

Conference

Conference2008 ASME Turbo Expo
CountryGermany
City2008 ASME Turbo Expo
Period9/06/0813/06/08

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    Huh, M., Liu, Y-H., Han, J. C., & Chopra, S. (2008). Effect of RIB spacing on heat transfer in a two-pass rectangular channel (AR=1:4) with a sharp entrance at high rotation numbers. In 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air (PART A ed., pp. 287-300). (Proceedings of the ASME Turbo Expo; Vol. 4, No. PART A). https://doi.org/10.1115/GT2008-50311