Heat transfer and flow temperature measurements in a rotating triangular channel with various rib arrangements |
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Authors: | Dong Hyun Lee Dong-Ho Rhee Kyung Min Kim Hyung Hee Cho Hee-Koo Moon |
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Institution: | (1) School of Mechanical Engineering, Yonsei University, Seoul, 120-749, Korea;(2) Korea Aerospace Research Institute, Daejeon, 305-333, Korea;(3) Solar Turbines Incorporated, San Diego, CA 92186, USA; |
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Abstract: | In the present study, the regionally-averaged heat transfer coefficients and flow temperature distributions were measured
in an equilateral triangular channel with three different rib arrangements (α = 45, 90 and 135°). To measure regionally-averaged heat transfer coefficients in the channel, two rows of copper blocks and
a single heater were installed on two ribbed walls. The fluid temperature distributions were obtained using a thermocouple-array.
The rotation number ranged from 0.0 to 0.1 with a fixed Reynolds number of 10,000. For the 90° ribs, the heat transfer coefficients
on the pressure side surface were increased significantly with rotation, while the suction side surface had lower heat transfer
coefficients than the stationary channel. For the angled ribs, rib-induced secondary flow dominated the heat transfer characteristics
and high heat transfer rates were observed on the regions near the inner wall for the 45° angled ribs and near the leading
edge for the 135° angled ribs. |
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