Experimental Study and Conjugate Heat Transfer Simulation of Turbulent Flow in a 90° Curved Square Pipe

Guanming Guo, Masaya Kamigaki, Qiwei Zhang, Yuuya Inoue, Keiya Nishida, Hitoshi Hongou, Masanobu Koutoku, Ryo Yamamoto, Hieaki Yokohata, Shinji Sumi and Yoichi Ogata
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Guanming Guo: Graduate School of Engineering, Hiroshima University, Hiroshima 7390046, Japan
Masaya Kamigaki: Graduate School of Engineering, Hiroshima University, Hiroshima 7390046, Japan
Qiwei Zhang: Graduate School of Engineering, Hiroshima University, Hiroshima 7390046, Japan
Yuuya Inoue: Graduate School of Engineering, Hiroshima University, Hiroshima 7390046, Japan
Keiya Nishida: Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima 7390046, Japan
Hitoshi Hongou: Mazda Motor Corporation, Hiroshima 7308670, Japan
Masanobu Koutoku: Mazda Motor Corporation, Hiroshima 7308670, Japan
Ryo Yamamoto: Mazda Motor Corporation, Hiroshima 7308670, Japan
Hieaki Yokohata: Mazda Motor Corporation, Hiroshima 7308670, Japan
Shinji Sumi: Mazda Motor Corporation, Hiroshima 7308670, Japan
Yoichi Ogata: Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima 7390046, Japan

Energies, 2020, vol. 14, issue 1, 1-21

Abstract: This paper discusses the turbulent flow and heat transfer from a uniform air flow with high temperature to the outside through a 90° curved square pipe. Both conjugate heat transfer (CHT) simulation and experiments of temperature field measurements at cross sections of the pipe are performed. A straight pipe is investigated and compared with the 90° curved pipe. The temperature of the air flow at the inlet of the pipe is set at 402 K, and the corresponding Reynolds number is approximately 6 × 10 4 . To obtain the spatial average temperature at each cross section, the temperature fields are measured along the streamwise of the pipes and in the circumferential direction using thermocouples at each cross section from the inlet to the outlet of both the straight and curved pipes. Furthermore, the simulation is performed for turbulent flow and heat transfer inside the pipe wall using the Re-normalization group (RNG) k-ε turbulence model and CHT method. Both the experimental and numerical results show that the curvature of the pipe result in a deviation and impingement in the high-temperature core and a separation between the wall and air, resulting in a secondary flow pattern of the temperature distribution.

Keywords: turbulent flow; secondary flow; temperature fields; conjugate heat transfer; heat exchanger (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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