On two-phase sediment transport: sheet flow of massive particles

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences Pub Date : 2004-08-08 DOI:10.1098/rspa.2003.1273

T. Hsu, J. Jenkins, P. Liu

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引用次数: 226

Abstract

A model is presented for concentrated sediment transport that is driven by strong, fully developed turbulent shear flows over a mobile bed. Balance equations for the average mass, momentum and energy for the two phases are phrased in terms of concentration–weighted (Favre averaged) velocities. Closures for the correlations between fluctuations in concentration and particle velocities are based on those for collisional grain flow. This is appropriate for particles that are so massive that their fall velocity exceeds the friction velocity of the turbulent fluid flow. Particular attention is given to the slow flow in the region of high concentration above the stationary bed. A failure criterion is introduced to determine the location of the stationary bed. The proposed model is solved numerically with a finite–difference algorithm in both steady and unsteady conditions. The predictions of sediment concentration and velocity are tested against experimental measurements that involve massive particles. The model is further employed to study several global features of sheet flow such as the total sediment transport rate in steady and unsteady conditions.

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论两相泥沙输运:大块颗粒的片状流

提出了一个由强烈的、充分发展的湍流剪切流在移动床上驱动的集中泥沙输运模型。两相的平均质量、动量和能量的平衡方程用浓度加权(法夫尔平均)速度表示。浓度波动与粒子速度之间关系的闭包是基于碰撞颗粒流的闭包。这适用于质量大到其下落速度超过湍流流动的摩擦速度的粒子。特别注意的是固定床层上方高浓度区域的缓慢流动。引入了一种破坏准则来确定固定床的位置。在稳态和非稳态条件下，采用有限差分算法对模型进行了数值求解。泥沙浓度和流速的预测是根据涉及大质量颗粒的实验测量结果进行检验的。利用该模型进一步研究了稳定和非稳定条件下板流的总输沙率等全局特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences

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期刊介绍： Proceedings A publishes articles across the chemical, computational, Earth, engineering, mathematical, and physical sciences. The articles published are high-quality, original, fundamental articles of interest to a wide range of scientists, and often have long citation half-lives. As well as established disciplines, we encourage emerging and interdisciplinary areas.