Fujio Akagi
Fukuoka University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Fujio Akagi.
ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D | 2011
Fujio Akagi; Keisuke Kawabata; Youichi Ando; Sumio Yamaguchi; Masato Furukawa
In order to use vortex rings for mass and momentum transport, the relationship between the circulation of vortex rings generated continuously by a pulsating jet flow, which are referred to herein as ‘cyclic vortex rings’, and the conditions of jet flow are investigated experimentally. The results indicate that the formation time at which the cyclic vortex rings reach maximum circulation, i.e., become optimal vortex rings, can be estimated using the concept proposed by Gharib et al. Based on their concept, the optimal vortex rings are formed when the translation velocity of the vortex core becomes equal to the convection velocity of the shear layer of the jet. The translation velocity of vortex rings and the convection velocity of shear layers can be estimated by empirical equations under pulsating jet conditions. Therefore, the formation time of the optimal vortex rings can be estimated from the pulsating jet conditions, when the circulation of vortex rings stop growing and the vortex rings start to become disconnected from the shear layers. The circulation of vortex rings estimated using this method is in good agreement with the measurement data within the measurement error. There exists a specific Strouhal number at which the circulation of the vortex rings reaches the maximum value. This Strouhal number is expected to be the optimal generating condition of cyclic vortex rings for using transportation.Copyright
Evergreen | 2017
Takayuki Oka; Taro Handa; Fujio Akagi; Sumio Yamaguchi; Toshiyuki Aoki; Koichiro Yamabe; Yusuke Kihara
1Department of Energy and Environmental Engineering Interdisciplinary Graduate School of Engineering Sciences, Kyushu University 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580 Japan 2Department of Advanced Science and Technology, Toyota Technological Institute 2-12-1 Hisakata, Tempaku-Ku, Nagoya, Aichi 468-8511 Japan 3Department of Mechanical Engineering, Fukuoka University 8-19-1 Nanakuma, Jyounan-Ku, Fukuoka 814-0180 Japan
Archive | 2015
Fujio Akagi; Isao Haraga; Sumio Yamaguchi; Yuichi Ando; Kazuo Higa
Transactions of the Japan Society of Mechanical Engineers. B | 2011
Fujio Akagi; Yuuki Okuzono; Youichi Ando; Sumio Yamaguchi; Masato Furukawa
The Proceedings of the Fluids engineering conference | 2016
Takayuki Oka; Taro Handa; Yu Matsuda; Yasuhiro Egami; Fujio Akagi; Sumio Yamaguchi; Koichiro Yamabe; Yuhei Masuda
The Proceedings of Mechanical Engineering Congress, Japan | 2016
Yuhei Masuda; Takayuki Oka; Koichiro Yamabe; Fujio Akagi; Taro Handa; Yu Matsuda; Yasuhiro Egami; Sumio Yamaguchi
The Proceedings of Conference of Kyushu Branch | 2015
Katsuya Mizuki; Fujio Akagi; Shougo Shimizu; Youichi Ando; Sumio Yamaguti
ASME/JSME/KSME 2015 Joint Fluids Engineering Conference | 2015
Takayuki Oka; Fujio Akagi; Taro Handa; Youichi Ando; Sumio Yamaguchi
ASME/JSME/KSME 2015 Joint Fluids Engineering Conference | 2015
Fujio Akagi; Kazuki Hifumi; Katsuya Mizuki; Youichi Ando; Sumio Yamaguchi
The Proceedings of the Fluids engineering conference | 2013
Kazuki Hifumi; Katsuya Mizuki; Takayuki Oka; Fujio Akagi; Youichi Ando; Sumio Yamaguchi
