Hydraulic conveying of snow
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- UMEMURA Teruyoshi
- Technological University of Nagaoka
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- NAKAYAMA Mikio
- Ibid., Graduate student
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- UCHIYAMA Akira
- Ibid., Graduate student
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- TOKUNAGA Yasushi
- Technological University of Nagaoka
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- SHIRAKASHI Masataka
- Technological University of Nagaoka
Bibliographic Information
- Other Title
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- 雪の水力輸送に関する研究
- ユキ ノ スイリョク ユソウ ニ カンスル ケンキュウ 8 セツスイ 2ソウリ
- VIII. Blocking of snow/water mixture flow and criterion of stagnation of snow at pipe orifice
- 第8報 雪水二相流の閉塞現象と絞りにおける停滞の発生限界
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Abstract
Based on observations of flows, an outline of the blocking phenomenon of snow/water mixture flow in closed channels was given. It was confirmed that a characteristic blocking occurred due to the property of snow in the mixture flow, i.e. a tendency of snow blocks to adhere to each other and to form a densified plug in the channel compressed by the water pressure. Since the blocking was revealed to originate from the stagnation of the snow cluster, the criterion at on orifice in a horizontal pipe was investigated experimentally. With pipe diameter D=47∼90 mm and the areal contraction ratio K=0.068∼0.27, the dependence of the critical flow velocity Vst (below which snow clusters were arrested at the orifice) on D, on K, on snow volume fraction C in discharge, and on the property of snow was made clear as follows.<BR>(1) When C<C*, where C* is 0.15 and 0.12 for granulated snow and fresh snow respectively, Vst is inversely proportional to D and independent of C. When C>C*, snow clusters almost fill the pipe and Vst is inversely proportional to D and proportional to C. While, the influence of K on Vst is not significant over the whole experimental range of C.<BR>(2) Fresn snow is apt to stagnate, and the critical values of DVst with C<C* and DVst/C with C>C* for fresh snow are 1.4 and 2 times the corresponding ones for granulated snow.<BR>(3) Blocking is avoidable by applying the critical values of DVst or DVst/C obtained in this work as the criterion of stagnation.
Journal
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- Journal of the Japanese Society of Snow and Ice
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Journal of the Japanese Society of Snow and Ice 48 (4), 207-214, 1986
The Japanese Society of Snow and Ice
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Details 詳細情報について
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- CRID
- 1390001206461129472
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- NII Article ID
- 130000902969
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- NII Book ID
- AN00131221
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- ISSN
- 18836267
- 03731006
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- NDL BIB ID
- 3114983
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed