雪の水力輸送に関する研究　ＩＸ　　高濃度輸送技術の開発

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書誌事項

タイトル別名
  • Hydraulic conveying of snow. IX Development of techniques for high snow concentration.
  • ユキ ノ スイリョク ユソウ ニ カンスル ケンキュウ 9 コウ ノウド ユソ
  • IX, Development of techniques for high snow concentration
  • 第9報 高濃度輸送技術の開発

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抄録

In order to improve the efficiency of the hydraulic conveying of snow by a pump-pipeline system, techniques to measure and control the in-situ concentration of snow/water mixture flowing in a pipe were developed, and the optimum condition was discussed on the basis of high concentration data obtained by applying these techniques.<BR>The volume snow fraction in pipe, C, was determined by the in-situ concentration meter devised here in the range of C=030% within 3% error. Using the devised water-separator, an instrument to extract water from the mixture flowing in a pipe, a high concentration flow up to C=35% was attained. This upper limit of C was caused by the choking of the water separator with a densified snow cluster.<BR>When C was greater than a critical value, Ccr, the pressure loss in a horizontal pipe increased rapidly with C, deviating from the value predicted by the method proposed so far. Although Ccr depends slightly on the flow velocity, roughly speaking, Ccr≥25% for the granulated snow and Ccr≥22% for the fresh snow. <BR>It was concluded that the power loss was minimized when C=Ccr under the condition that the mass flow-rate of snow and the conveying distance were given.

収録刊行物

  • 雪氷

    雪氷 49 (2), 59-66, 1987

    公益社団法人 日本雪氷学会

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