An experimental study was made to obtain heat transfer data for a two-pass rectangular channel (aspect ratio=2:1) with smooth and ribbed surfaces for two channel orientations (90 deg and 135 deg with respect to the plane of rotation). The V-shaped ribs are placed on the leading and trailing surfaces. Five different arrangements of 45 deg V-shaped ribs are studied. The Reynolds number and rotation number ranges are 5000–40000, and 0.0–0.21, respectively. The rib height to hydraulic diameter ratio (e/D) is 0.094; the rib pitch-to-height ratio (P/e) is 10; and the inlet coolant-to-wall density ratio (Δρ/ρ) is maintained around 0.115 for every test. The results show that the rotation-induced secondary flow enhances the heat transfer of the first pass trailing surface and second pass leading surface. However, the first pass leading and the second pass trailing surfaces show a decrease in heat transfer with rotation. The results also show that parallel 45 deg V-shaped rib arrangements produce better heat transfer augmentation than inverted 45 deg V-shaped ribs and crossed 45 deg V-shaped ribs, and a 90 deg channel orientation produces greater rotating effect on heat transfer than a 135 deg orientation.
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Technical Papers
Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=2) With Five Different Orientations of 45 Deg V-Shaped Rib Turbulators
Luai AL-Hadhrami, Research Assistant,
Luai AL-Hadhrami, Research Assistant
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
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Todd Griffith, Research Assistant,
Todd Griffith, Research Assistant
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
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Je-Chin Han, M.C. Easterling Endowed Chair
e-mail: jchan@mengr.tamu.edu
Je-Chin Han, M.C. Easterling Endowed Chair
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
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Luai AL-Hadhrami, Research Assistant
**
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
Todd Griffith, Research Assistant
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
Je-Chin Han, M.C. Easterling Endowed Chair
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
e-mail: jchan@mengr.tamu.edu
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division January 25, 2002; revision received November 8, 2002. Associate Editor: H. S. Lee.
J. Heat Transfer. Apr 2003, 125(2): 232-242 (11 pages)
Published Online: March 21, 2003
Article history
Received:
January 25, 2002
Revised:
November 8, 2002
Online:
March 21, 2003
Citation
AL-Hadhrami, L., Griffith, T., and Han, J. (March 21, 2003). "Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=2) With Five Different Orientations of 45 Deg V-Shaped Rib Turbulators ." ASME. J. Heat Transfer. April 2003; 125(2): 232–242. https://doi.org/10.1115/1.1561455
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