A computational study of three-dimensional turbulent flow and heat transfer was
performed in four types of rotating channels.
The first type is a rotating rectangular channel with V-shaped ribs. The channel
aspect ratio (AR) is 4:1, the rib height-to-hydraulic diameter ratio (e/Dh) is 0.078 and the
rib pitch-to-height ratio (P/e) is 10. The rotation number and inlet coolant-to-wall
density ratio were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the
Reynolds number was varied from 10,000 to 500,000. Three channel orientations (90
degrees, -135 degrees, and 135 degrees from the rotation direction) were also
investigated.
The second type is a rotating rectangular channel with staggered arrays of pinfins.
The channel aspect ratio (AR) is 4:1, the pin length-to-diameter ratio is 2.0, and the
pin spacing-to-diameter ratio is 2.0 in both the stream-wise and span-wise directions.
The rotation number and inlet coolant-to-wall density ratio varied from 0.0 to 0.28 and
from 0.122 to 0.20, respectively, while the Reynolds number varied from 10,000 to 100,000. For the rotating cases, the rectangular channel was oriented at 150 degrees with
respect to the plane of rotation.
In the rotating two-pass rectangular channel with 45-degree rib turbulators,
three channels with different aspect ratios (AR=1:1; AR=1:2; AR=1:4) were
investigated. Detailed predictions of mean velocity, mean temperature, and Nusselt
number for two Reynolds numbers (Re=10,000 and Re=100,000) were carried out. The
rib height is fixed as constant and the rib-pitch-to-height ratio (P/e) is 10, but the rib
height-to-hydraulic diameter ratios (e/Dh) are 0.125, 0.094, and 0.078, for AR=1:1,
AR=1:2, and AR=1:4 channels, respectively. The channel orientations are set as 90
degrees, the rotation number and inlet coolant-to-wall density ratio varied from 0.0 to
0.28 and from 0.13 to 0.40, respectively.
The last type is the rotating two-pass smooth channel with three aspect ratios
(AR=1:1; AR=1:2; AR=1:4). Detailed predictions of mean velocity, mean temperature
and Nusselt number for two Reynolds numbers (Re=10,000 and Re=100,000) were
carried out. The rotation number and inlet coolant-to-wall density ratio varied from 0.0
to 0.28 and from 0.13 to 0.40, respectively.
A multi-block Reynolds-averaged Navier-Stokes (RANS) method was employed
in conjunction with a near-wall second-moment turbulence closure.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4957 |
| Date | 25 April 2007 |
| Creators | Su, Guoguang |
| Contributors | Chen, Hamn-Ching, 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 Dissertation, text |
| Format | 5184374 bytes, electronic, application/pdf, born digital |
Page generated in 0.1916 seconds