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On the Hydraulic Resistance of Two Dimensional Roughness

山口大学工学部学報 Volume 10 Issue 1 Page 85-91
published_at 1959
KJ00000155201.pdf
[fulltext] 496 KB
Title
二次元粗度の流体抵抗について
On the Hydraulic Resistance of Two Dimensional Roughness
Creators Tsubaki Toichiro
Source Identifiers
Synopsis. As the foundamental cases of two dimensional roughness, we have discussed the flow characteristics of stream over the rectangular roughness and of the cylinderical roughness placed transversely to the direction of flow. Taking into account the properties of wake created by the roughness, the flow pattern within the roughness layor and the hydrodynamical forces acting on the battens themselves are estimated. As the results, it is pointed out that the occurrence of the maximum of the equivalent roughness at the spaceing-height ratio of 9?18,which has been well known experimentally with no satisfactory theory, is attributed to the fact that the shape resistance per one roughness increases with increase of spaceing-height ratio, while the number of roughness per unit length decreases conversely. The theoretical results are verified with the experimental results summarised by J. W. Johnson for rectangular roughness and with those by Hosoi for cylinderical roughness.
Subjects
土木工学 ( Other)
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1959
File Version Version of Record
Access Rights open access
Relations
[NCID]AN00244217
Schools 工学部