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Effects of Orbital Motion on the Boundary Layer Flow on a Spinning Disk

Open Journal of Fluid Dynamics 2012年第4期2卷 187-194页

作者： Mizue Munekata Naoya Jobi koichi ikebe Hiroyuki Yoshikawa Graduate School of Science and Technology Kumamoto University Kumamoto Japan Mechanical Engineering Department Kumamoto University Kumamoto Japan

The objective of this study is to experimentally examine the effects of orbital motion on the boundary layer flow on a spinning disk. The boundary layer flow on the disk is visualized by the oil flow method, and velocity in the boundary layer is measured by the hot-wire method. For the oil flow pattern in the case of spinning motion only, streaks are clearly observed on the disk as transient vortices, but by adding orbital motion to the spinning motion, we find that streaks are not observed in a certain range of orbital conditions. With increasing orbital motion speed, the laminar re- gion becomes narrower and transition is promoted from the inward region of the disk, regardless of the direction of ro- tation. Also, with the addition of orbital motion, the velocity profile in the boundary layer becomes more asymmetric with respect to the spin axis of the disk. Furthermore, stationary vortices do not appear on the disk when the orbital speed is beyond a certain critical value. Therefore, the lack of streaks in the oil film pattern when orbital motion is added is due to the spatiotemporal unsteadiness of the flow field on the disk.

关键词： Rotating Disk Transition Boundary Layer Flow Visualization Velocity Measurement

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Effect of Post-ERCP Pancreatitis on Perioperative Factors of Pancreaticoduodenectomy

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Surgical Science 2015年第2期6卷 35-41页

作者： Teijiro Hirashita Toshifumi Matsumoto koichi Izumi Masahiko ikebe Tokujiro Yano Yoichi Muto Susumu Matsuo Department of Surgery National Hospital Organization Beppu Medical Center Beppu Japan Department of Gastroenterology National Hospital Organization Beppu Medical Center Beppu Japan

Background:?Endoscopic retrograde cholangiopancreatography (ERCP) is commonly performed for biliary drainage and examination of the biliary and pancreatic duct before pancreaticoduodenectomy (PD). The influence of preoperative post-ERCP pancreatitis on PD is unknown. The aim of this study was to evaluate the relation between post-ERCP pancreatitis before PD and surgical outcomes of PD. Methods: We examined 38 patients who underwent PD. The relations between post-ERCP pancreatitis before PD and perioperative factors of PD such as patient characteristics, operative findings, and postoperative course were evaluated with univariate and multivariate analyses. Results: Post-ERCP pancreatitis was observed in 12 (37.5%) of the 38 patients. Univariate analyses showed operative procedure (P?= 0.034), operation time (P?= 0.004), blood loss (P?= 0.031), C-reactive protein (P?= 0.043), and delayed gastric emptying (P?= 0.035) to be significantly associated with post-ERCP pancreatitis. Multivariate analyses showed operation time (OR, 1.017;?95%CI, 1.000 - 1.034;?P?= 0.049) and delayed gastric emptying (OR, 18.72;95%CI, 1.139 - 307.6;?P?= 0.040) to be significantly associated with post-ERCP pancreatitis. Conclusions: Post-ERCP pancreatitis was associated with prolonged operation time and delayed gastric emptying in patients undergoing PD.

关键词： Endoscopic Retrograde Cholangiopancreatography Post-ERCP Pancreatitis Pancreaticoduodenectomy

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