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Thermal Performance of V-Shaped and X-Shaped Ribs in Trapezoidal Cooling Channels

Author

Listed:
  • Wei-Jie Su

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan)

  • Yao-Hsien Liu

    (Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan)

Abstract

Convective heat transfer enhancement using rib turbulators is effective for turbine blade internal cooling. Detailed heat transfer measurement of X-shaped ribs in a trapezoidal cooling channel was experimentally conducted using infrared thermography. The novel X-shaped ribs were designed by combining two V-shaped ribs, and more secondary flows generated by the X rib delivered higher heat transfer enhancement. The Reynolds numbers in this study were 10,000, 20,000, and 30,000. These ribs were installed on two opposite walls of a trapezoidal channel in a staggered arrangement. The rib pitch-to-height ratios were 10 and 20, and the rib height-to-hydraulic diameter ratio was 0.128. Results indicated that higher heat transfer distribution was observed in the vicinity of the shorter base in the trapezoidal channel. The full X-shaped ribs and the V-shaped ribs demonstrated the highest Nusselt number ratios among all the cases. Although full X-shaped ribs contributed to higher heat transfer improvement due to intensified secondary flows, they also caused significant pressure loss. Therefore, the cutback X-shaped ribs were proposed by removing a segment in the rib at either upstream or downstream region. Consequently, the upstream cutback X-shaped rib and the V-shaped rib produced the highest thermal performance in this trapezoidal channel.

Suggested Citation

  • Wei-Jie Su & Yao-Hsien Liu, 2021. "Thermal Performance of V-Shaped and X-Shaped Ribs in Trapezoidal Cooling Channels," Energies, MDPI, vol. 14(16), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4826-:d:610379
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    References listed on IDEAS

    as
    1. Kuan-Tzu Huang & Yao-Hsien Liu, 2019. "Enhancement of Mist Flow Cooling by Using V-Shaped Broken Ribs," Energies, MDPI, vol. 12(19), pages 1-18, October.
    2. Lee, Dong Hyun & Rhee, Dong-Ho & Kim, Kyung Min & Cho, Hyung Hee & Moon, Hee Koo, 2009. "Detailed measurement of heat/mass transfer with continuous and multiple V-shaped ribs in rectangular channel," Energy, Elsevier, vol. 34(11), pages 1770-1778.
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