Abstract
Kiwifruit vines with broad leaves are easily torn or shed by high-speed wind. In this study, the threshold wind speed at which a cane is broken was investigated experimentally with varying physical parameters of a kiwifruit vine under two different ABL (atmospheric boundary layer) conditions. In addition, the temporal variation of wind-blown young canes was visualized using a high-speed camera. The average threshold wind speeds for ABL types A and B are about 20.5 m/s and 18.9 m/s, respectively. A wind-blown young cane takes periodic up-and-down motion when it is broken off. The mean fluttering frequency of young canes of the kiwifruit vines was found to be about 4.5 Hz.
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Jong Hoon Kang: He received his master degree in Mechanical Engineering in 2004 from POSTECH. He is a Ph.D student at POSTECH and his research interests are PSP technique, flow visualization, bluff-body aerodynamics and wind engineering.
Sang Joon Lee: He received his MSc and Ph.D. in Mechanical Engineering from KAIST (Korea Advanced Institute of Science and Tech.) in 1982 and 1986, respectively. In 1986 he worked as a senior researcher at KIMM. He joined the Department of Mechanical Engineering at POSTECH as an Assistant Professor in 1987, and in 1999 he became a full professor. His research interests include quantitative flow visualization (PIV, PTV, LIF, X-ray imaging and Holography), experimental fluid mechanics, bluff body aerodynamics, bio-fluid flows, microfluidics, and flow control.
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Kang, J.H., Lee, S.J. Mechanical response of young canes of wind-blown kiwifruit vines. J Vis 11, 231–238 (2008). https://doi.org/10.1007/BF03181711
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DOI: https://doi.org/10.1007/BF03181711