caa a22 4500 477093000 CHVBK 20180405111520.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00189378 doi (NATIONALLICENCE)springer-10.1007/BF00189378 Swirling flows in circular-to-rectangular transition ducts [Elektronische Daten] [J. Miau, E. Lin, Q. Chen, J. Chou, D. Pan, C. Lin] Swirling flows in three circular-to-rectangular transition ducts, each of them with an aspect ratio of 2.0 at the rectangular exit, have been studied experimentally. The swirling flows were produced by swirlers whose vane angles were at 5°, 10° and 20° inclinded to the incoming flow, respectively. Flow visualization experiments were made at selected cross-sectional planes in the transition ducts. Pressure and velocity measurements were obtained on the contoured duct walls and at the rectangular exit planes, respectively. The results show that the swirling flow pattern evolves into a skewed structure at the exit plane which, in connection with the wall pressure distributions, is asymmetric with respect to the centerline of either the top and bottom walls or the side walls. Moreover, an analysis based on the mean streamwise vorticity equation with the velocity data obtained immediately downstream of the rectangular exit plane indicates that the cross-stream Reynolds stress plays an important role in transporting the streamwise vorticity of the swirling flow into the surrounding fluid. Springer-Verlag, 1996 Miau J. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut Lin E. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut Chen Q. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut Chou J. Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, Republic of China aut Pan D. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut Lin C. Chung-Shan Institute of Science and Technology, Taichung, Taiwan, Republic of China aut Experiments in Fluids Springer-Verlag 20/6(1996-04-01), 401-409 0723-4864 20:6<401 1996 20 348 https://doi.org/10.1007/BF00189378 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189378 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Miau J. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Lin E. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Chen Q. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Chou J. Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Pan D. Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Lin C. Chung-Shan Institute of Science and Technology, Taichung, Taiwan, Republic of China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 20/6(1996-04-01), 401-409 0723-4864 20:6<401 1996 20 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer