2026-03-05T07:42:17Z https://kanazawa-u.repo.nii.ac.jp/oai

oai:kanazawa-u.repo.nii.ac.jp:00008803 2024-06-20T06:27:05Z 934:935:936

円管内オリフィス下流域における壁面せん断応力の時間平均と変動成分 Time-averaged and fluctuated wall shear stresses downstream from an orifice in a circular pipe 木綿, 隆弘 1151 40255107 40255107 歌野原, 陽一 12453 中村, 晶 12454 木村, 繁男 10640 70272953 70272953 小松, 信義 459 20436827 20436827 20436827 山田, 紘司 12455 菅原, 康裕 12456 中道, 淳平 12457 In the present study, the distributions of time-averaged and fluctuated wall shear stresses downstream from an orifice were measured using a Flow Vector Sensor of MEMS (Micro Electro Mechanical System). The air flow was supplied to a circular pipe from a blow-down wind tunnel. The diameter of the pipe is D = 194 mm and the diameter of the orifice is d = 97mm, yielding a diameter ratio of 0.5. The axial distance from separation (orifice) to reattachment was approximately 2.5D. Near the wall in the recirculating region, the minimum mean wall shear stress was located at approximately x/D = 1.75, and the maximum rms value of the wall shear stress was approximately x/D = 1 - 2. The experimental results were found to approximately agree with the numerical results obtained previously by Large-eddy simulation. It seems that using the fluctuated wall shear stress to estimate the FAC(Flow-Accelerated Corrosion) rate of the circular pipe wall downstream from the orifice is appropriate. ©2013 The Japan Society of Mechanical Engineers. journal article 日本機械学会 = The Japan Society of Mechanical Engineers, JSME 2013-01-01 AM application/pdf Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 799 79 258 262 AN00187441 0387-5016 https://kanazawa-u.repo.nii.ac.jp/record/8803/files/TE-PR-KIWATA-T-258.pdf http://hdl.handle.net/2297/34662 https://kanazawa-u.repo.nii.ac.jp/records/8803 jpn http://www.jsme.or.jp/