Heat Transfer Characteristics of Turbulent Flow in Double-90°-Bend Pipes

Yuki Kato, Kenmei Fujimoto, Guanming Guo, Mikimasa Kawaguchi, Masaya Kamigaki, Masanobu Koutoku, Hitoshi Hongou, Haruna Yanagida and Yoichi Ogata ()
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Yuki Kato: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
Kenmei Fujimoto: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
Guanming Guo: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
Mikimasa Kawaguchi: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
Masaya Kamigaki: Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Hiroshima 730-8670, Japan
Masanobu Koutoku: Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Hiroshima 730-8670, Japan
Hitoshi Hongou: Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Hiroshima 730-8670, Japan
Haruna Yanagida: Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Hiroshima 730-8670, Japan
Yoichi Ogata: Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-0046, Japan

Energies, 2023, vol. 16, issue 21, 1-25

Abstract: This study evaluates the heat dissipation and Nusselt number for an S-shaped double-bend pipe, for which an experimental evaluation is lacking. In terms of the velocity field, the mean velocity and turbulent kinetic energy were measured through particle image velocimetry. Heat transfer characteristics were evaluated in validated conjugate heat transfer simulations, and a k - ω SST turbulence model was used for flow simulation inside the pipe. Heat transfer enhancement was observed at the first bend, as observed in previous studies on single-bend and U-shaped bends, whereas no heat transfer enhancement was observed at the second bend. This result was due to higher turbulent heat flux at the first bend because of higher eddy diffusion on the outside of the bend, whereas eddy diffusion was lower on the outside of the second bend owing to the history of the first bend. The heat transfer characteristics of the S-shaped double-bend pipe elucidated in this study provide valuable insight for devising strategies to reduce heat loss in automotive exhaust pipes with multiple bends. Furthermore, the conjugate heat transfer simulation model used in this study provides a benchmark for heat transfer calculations for multi-bend pipes.

Keywords: local heat transfer; bend pipe; temperature field; conjugate heat transfer simulation; turbulent flow (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: 2023
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