Rib-spacing effect on heat transfer in rectangular channels at high rotation numbers

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This study experimentally determined the effects of rib spacing on heat transfer in a rotating 1:4ARchannel with a sharp-bend entrance. The leading and trailing walls used 45 deg angled ribs. The rib-height-to-hydraulic-diam ratio e/D h was 0.078. The rib-pitch-to-rib-height ratios P/e studied were P/e = 2:5, 5, and 10. Each ratio was tested at five Reynolds numbers up to 40,000. For each Reynolds number, experiments were conducted at five rotational speeds up to 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 the total area, and 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 Bo x for a ribbed 1:4ARchannel up to 0.65 and 1.5, respectively. Correlations for predicting heat transfer enhancement due to rotation in the ribbed 1:4ARchannel, based on the extended range of the rotation number and buoyancy parameter, are presented in the paper.

Original languageEnglish
Pages (from-to)294-304
Number of pages11
JournalJournal of Thermophysics and Heat Transfer
Volume23
Issue number2
DOIs
StatePublished - 1 Apr 2009

Fingerprint Dive into the research topics of 'Rib-spacing effect on heat transfer in rectangular channels at high rotation numbers'. Together they form a unique fingerprint.

Cite this