The research focuses on testing the heat transfer enhancement in a channel for
different spacing of the rib turbulators. Those ribs are put on the surface in the two pass
rectangular channel with an aspect ratio of AR=1:2. The cross section of the rib is
1.59 x 1.59 mm. Those ribs are put on the leading and trailing walls of the channel with
the angle of flow attack to the mainstream of 45ð. The rotating speed is fixed at 550-RPM
with the channel orientation at ò=90ð. Air is used as the coolant through the cooling
passage with the coolant-to-wall density ratio ( ààâ ) maintained around 0.115 in the
first pass and 0.08 in the second pass. The Reynolds numbers are controlled at 5000,
10000, 25000, and 40000. The rib spacing-to-height ratios (P/e) are 3, 5, 7.5, and 10. The
heat transfer coefficient and friction factor are measured to determine the effect of the
different rib distributions. Stationary cases and rotational cases are examined and
compared. The result shows that the highest thermal performance is P/e=5 for the
stationary case and P/e=7.5 for the rotating case.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4131 |
| Date | 30 October 2006 |
| Creators | Liu, Yao-Hsien |
| Contributors | Han, Je-Chin |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 1124286 bytes, electronic, application/pdf, born digital |
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