Mechanics of hyperconcentrated sediment laden flow

超浓缩沉积物流动的力学

• 批准号: 06650562
• 负责人: EGASHIRA Shinji
• 金额: $ 1.47万
• 依托单位: RITSUMEIKAN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650562/
• 关键词: multi-phase flow; debris flow; mud flow; sediment laden flow; constitutive equations; 固液混相流; 浮遊砂粒; 構成則・抵抗則; 土石流・泥流; 粒子間応力; レイノルズ応力

Discussions are made on the effect of particle size on the flow structure of sand particle-water mixture in order to investigate the mechanics of debris/mud flows and general sediment laden flows. The experimental results show that a quasi-laminar region is formed on the movable bed even in the flow of fine sediment-water mixture and its depth increases with the increase of sediment concentration as well as of particle size. Generally, the equilibrium bed slope can be predicted in terms of particle to particle friction angle and sediment concentration in the case that sediment particles behave as a laminar motion, which is common in debris flows composed of coarse sediment. But, it is rearized tha the bed slope becomes smaller than that of debris flows. A two-layr model which constitutes the upper and lower layrs is proposed to deseribe such phenomena. The shear stress in the upper layr is governed by turbulent motions. and in the lower layr by the constitutive relations developed by Egashira, etal.

讨论粒径对砂颗粒混合物的流动结构的影响，以研究碎屑/泥流的机制和载有泥沙的一般沉积物。实验结果表明，即使在细泥浆 - 水混合物的流动中，也会在可移动床上形成一个准层状区域，并且其深度随着沉积物浓度和粒径的增加而增加。通常，在沉积物颗粒作为层状运动的表现，可以根据粒子摩擦角度和沉积物浓度来预测平衡床斜率，这在由粗沉积物组成的碎屑流中很常见。但是，它被抬起，床坡度比碎屑流的小。提出了构成上部和下层的两层模型来灭绝这种现象。上层上的剪切应力受湍流运动的控制。并在较低的Layr中，由Egashira等建立的构成关系。

项目成果

江頭進治: "砂粒子を高濃度に含む流れに及ぼす粒子径の影響" 京都大学防災研究所年報. 37号B-2. 359-369 (1994)

Shinji Egashira：“颗粒尺寸对含有高浓度沙粒的流动的影响”，京都大学防灾研究所年度报告，37 No. 359-369 (1994)。

Egashira, S., Yoshizumi, M.and T.Ito: "Sediment movement modes and transport capacity in open channel with rigid bed" Annual Journal of Hydraulic Eng., JSCE. Vol.40. (1996)

Egashira，S.，Yoshizumi，M.和T.Ito：“刚性床明渠中的沉积物运动模式和输送能力”水利工程年刊，JSCE。

Ashida, K., Egashira, S., etal: "Governing equations of solid-liquid two phase flow and their application" Annual Journal of Hydraulic Eng., JSCE. VoL.39. (1995)

Ashida, K.、Egashira, S. 等人：“固液两相流控制方程及其应用”，液压工程年刊，JSCE。

Egashira, S., Sato.and K.Chishiro: "Effect of particle size on the flow structure of sand-water mixture" Annuals, DPRI,Kyoto Univ.Vol.37B-2. (1994)

Egashira, S.、Sato. 和 K.Chishiro：“颗粒尺寸对沙水混合物流动结构的影响”Annals，DPRI，Kyoto Univ.Vol.37B-2。

芦田和男 他: "固液混相流における支配方程式とその適用性" 水工学論文集、土木学会. 39巻. 537-548 (1995)

Kazuo Ashida 等人：“控制方程及其在固液多相流中的适用性”，《水利工程学报》，日本土木工程师学会，第 39 卷，537-548（1995 年）。