Effects of rib arrangements on pressure drop and heat transfer in a rib-roughened channel with a sharp 180 deg turn
- Tokyo Univ. of Agriculture and Technology, Koganei (Japan). Dept. of Mechanical Systems Engineering
The objective of this study was to investigate, through experiments, the combined effects of a sharp 180 deg turn and rib patterns on the pressure drop performance and distributions of the local heat transfer coefficient in an entire two-pass rib-roughened channel with a 10 deg turn. The rib pitch-to-equivalent diameter ratio P/d{sub e} was 1.0, the rib-height-to-equivalent diameter ratio e/d{sub e} was 0.09, and the rib angle relative to the main flow direction was varied from 30--90 deg with an interval of 15 deg. Experiments were conducted for Reynolds numbers in the range 4,000--30,000. It was disclosed that, due to the interactions between the bend-induced secondary flow and the rib-induced secondary flow, the combination of rib patterns in the channel before and after the turn causes considerable differences in the pressure drop and heat transfer performance of the entire channel.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 516733
- Journal Information:
- Journal of Turbomachinery, Journal Name: Journal of Turbomachinery Journal Issue: 3 Vol. 119; ISSN JOTUEI; ISSN 0889-504X
- Country of Publication:
- United States
- Language:
- English
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