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5-1 学術雑誌論文 >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10131/3780
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| Title: | 円管内の加速・減速流れに関する研究 : 第2報, 加速流れの乱流遷移 |
| Other Titles: | Accelerated and Decelerated Flows in a Circular Pipe : 2nd Report, Transition of an Accelerated Flow |
| Author: | 黒川, 淳一
高木, 彰 |
| Affiliation: | 横浜国立大学工学部
横浜国立大学大学院 |
| Keywords: | Unsteady Flow
Pipe Flow
Transient Flow
Transition
Critical Reynolds Number
Turbulence
Velocity Distribution |
| Issue Date: | 25-Feb-1988 |
| Publisher: | 社団法人日本機械学会 |
| Abstract: | In the preceding report, it was made clear that there exists two types of flow transition from laminar to turbulent in an accelerated flow depending on the degree of acceleration. In order to determine the mechanism of these types of transition the present measurements were performed and the change of the velocity profile at each time step was compared at two different stations. The results show that in the case of relatively large acceleration (r_0/u_<st>T>10^<-3>), flow transition takes place simultaneously over the whole area in a pipe due to the flow instability. On the contrary, in the case of relatively small acceleration ((r_0/u_<st>T<10^<-3>), flow transition takes place near the pipe inlet and forms a discontinuous surface (transition surface) propagating to the downstream with a velocity larger than the mean flow velocity. In this case the velocity profile changes smoothly from laminar to turbulent in the upstream but becomes peculiar in the downstream due to the development of the transition region. |
| URI: | http://hdl.handle.net/10131/3780 |
| Type: | Journal Article |
| Language: | jpn |
| ISSN: | 03875016 |
| NCID: | AN00187441 |
| Journal Title: | 日本機械学會論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B |
| Volume: | 54 |
| Issue: | 498 |
| Start Page: | 302 |
| End Page: | 307 |
| Version: | publisher |
| Appears in Collections: | 5-1 学術雑誌論文
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Files in This Item:
| File |
Description |
Size | Format |
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| B-041.pdf | | 498Kb | Adobe PDF | View/Open |
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