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| 1 | VISUALIZATION OF TURBULENT REACTIVE JET BY USING DIRECT NUMERICAL SIMULATION显示文摘Direct numerical simulation(DNS)of turbulent planar jet with a second-order chemical reaction(A+B→R)is performed to investigate the processes of mixing and chemical reactions in spatially developing turbulent free shear flows.Reactant A is premixed into the jet flow,and reactant B is premixed into the ambient flow.DNS is performed at three different Damk¨ohler numbers(Da=0.1,1,and 10).Damk¨ohler number is a ratio of a time scale of a flow to that of chemical reactions,and in this study,the large Da means a fast chemical reaction,and the small Da means a slow chemical reaction.The visualization of velocity field shows that the jet flow is developed by entraining the ambient fluid.The visualization of concentration of reactant A shows that concentration of reactant A for Da=1 and 10 becomes very small in the downstream region because the chemical reaction consumes the reactants and reactant A is diffused with the jet development.By comparison of the profiles of chemical reaction rate and concentration of product R,it is found that product R for Da=10 is produced by the chemical reaction at the interface between the jet and the ambient fluids and is diffused into the jet flow,whereas product R for Da=0.1 is produced in the jet flow after reactants A and B are well mixed. | TOMOAKI WATANABE YASUHIKO SAKAI KOUJI NAGATA OSAMU TERASHIMA HIROKI SUZUKI TOSHIYUKI HAYASE YASUMASA ITO | 2013 | International Journal of Modeling, Simulation, and Scientific Computing2013，4，S01： | 2 |
| 2 | Long-term results of radiotherapy for intracranial germinoma: a multi-institutional retrospective review of 126 patients显示文摘 | Kazuhiko Ogawa Naoto Shikama Takafumi Toita Katsumasa Nakamura Takashi Uno Hiroshi Onishi Jun Itami Yasumasa Kakinohana Takao Kinjo Yoshihiko Yoshii Hisao Ito Sadayuki Murayama | 2004 | International Journal of Radiation Oncology, Biology, Physics2004，，3： | 1 |
| 3 | Amides of the fruit of Zanthoxylum spp.显示文摘 | Yoshiki Kashiwada Chikashi Ito Hitoshi Katagiri Izumi Mase Katsuko Komatsu Tsuneo Namba Yasumasa Ikeshiro | 1997 | Phytochemistry1997，，6： | 1 |
| 4 | Amides of the fruit of Zanthoxylum spp.显示文摘 | Yoshiki Kashiwada Chikashi Ito Hitoshi Katagiri Izumi Mase Katsuko Komatsu Tsuneo Namba Yasumasa Ikeshiro | 1997 | Phytochemistry1997，，6： | 1 |
| 5 | Clinical course of gastrointestinal stromal tumor diagnosed by endoscopic ultrasound‐guided fine‐needle aspiration显示文摘 | Masanari Sekine Hiroshi Imaoka Nobumasa Mizuno Kazuo Hara Susumu Hijioka Yasumasa Niwa Masahiro Tajika Tsutomu Tanaka Makoto Ishihara Seiji Ito Kazunari Misawa Yuichi Ito Yasuhiro Shimizu Yasushi Yatabe Hirohide Ohnishi Kenji Yamao | 2015 | Digestive Endoscopy2015，，1： | 1 |
| 6 | Dynamics and geometry of developing planar jets based on the invariants of the velocity gradient tensor显示文摘Based on the direct numerical simulation(DNS), the developing planar jets under different initial conditions, e.g., the conditions of the exit Reynolds number and the exit mean velocity profile, are investigated. We mainly focus on the characteristics of the invariants of the velocity gradient tensor, which provides insights into the evolution of the dynamics and the geometry of the planar jets along with the flow transition. The results show that the initial flow near the jet exit is strongly predominated by the dissipation over the enstrophy, the flow transition is accompanied by a severe rotation and straining of the flow elements, where the vortex structure evolves faster than the fluid element deformation, in the fully-developed state, the irrotational dissipation is dominant and the most probable geometry of the fluid elements should remain between the biaxial stretching and the axisymmetric stretching. In addition, with a small exit Re and a parabolic profile for the exit mean streamwise velocity, the decay of the mean flow field and the magnitude of the turbulent variables will be strengthened in the process of the flow transition, however, a large exit Re will promote the flow transition to the fully-developed state. The cross-impact between the exit Re and the exit mean velocity profile is also observed in the present study. | 吴楠楠 SAKAI Yasuhiko NAGATA Kouji ITO Yasumasa | 2015 | Journal of Hydrodynamics2015，27，6： | 0 |
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