非均匀悬浮泥沙输运方程

IF 1.7 3区工程技术 Q3 ENGINEERING, CIVIL

Journal of Hydraulic Research Pub Date : 2022-11-18 DOI:10.1080/00221686.2022.2106594

B. Jia, Lei Zhang, D. Zhong

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引用次数: 0

摘要

非均匀泥沙悬浮物的理论研究由于难以阐明非均匀泥沙相互作用而受到限制。基于多分散两相流理论，推广了一种新的非均匀悬浮泥沙输运方程，以解释非均匀颗粒相互作用及其对悬浮泥沙的影响。利用Sherman-Morrison-Woodbury公式和摄动渐近技术求解动量方程，推导出漂移速度的本构关系，而不是进行数值离散化。应用于明渠水流，推导出了不同粒径泥沙的浓度曲线，并与实验和现场数据进行了比较，得到了令人满意的一致性。泥沙非均匀悬浮主要由流体湍流、重力、颗粒惯性和非均匀颗粒相互作用等因素引起。非均匀效应在河床附近发挥重要作用，并与泥沙浓度和粒度比呈正相关，有助于深入了解悬架力学。

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Transport equation for nonuniform suspended sediment

Theoretical research on nonuniform sediment suspension is limited due to difficulties of elucidating nonuniform particle interaction. A new transport equation is generalized for nonuniform suspended sediment based on multi-dispersed two-phase flow theory, to account for nonuniform particle interaction and its effect on sediment suspension. Instead of implementing numerical discretization, constitutive relation of drift velocity is derived by solving the momentum equations with the aid of the Sherman–Morrison–Woodbury formula and the perturbation asymptotic technique. Applied to open channel flows, concentration profiles for each grain size of sediment are derived and a satisfactory consistency is obtained in comparison with both experimental and field data. Nonuniform sediment suspension is attributed to fluid turbulence, gravity, particle inertia and nonuniform particle interaction. The nonuniform effect plays an important role in the vicinity of the riverbed and is positively correlated to sediment concentration and grain size ratios, which helps bring insight into the suspension mechanics.

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来源期刊

Journal of Hydraulic Research 工程技术-工程：土木

CiteScore

4.90

自引率

4.30%

发文量

审稿时长

6.6 months

期刊介绍： The Journal of Hydraulic Research (JHR) is the flagship journal of the International Association for Hydro-Environment Engineering and Research (IAHR). It publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current tendencies in water research, outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially invited. Although the preference is given to the fundamental issues, the papers focusing on important unconventional or emerging applications of broad interest are also welcome.