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KINETIC MODELING OF CONSTITUTIVE RELATIONS FOR PARTICLE MOTION IN LOW TO MODERATELY CONCENTRATED FLOWS

International Journal of sediment Research 2005年第4期20卷 305-318页

作者： guangqian wang1, Xudong fu1 and {2. wang11 key lab for water and sediment sciences of the ministry of education, department of hydraulic engineering,{{12., Beijing 100084, china key lab for {2. and sediment sciences of the ministry of education Department of Hydraulic EngineeringTsinghua University Beijing 100084 China

Formulating underlying mechanisms of concentrated solid-liquid flows is essential for simulation of various industrial processes and natural phenomena. A generalized constitutive model for particle motion in flows with low to moderate solids concentrations is developed. This generalized model facilitates characterization of inelastic collisions, particle-fluid interactions, and shearing effects. Moderately concentrated simple shear flows of a sand-water mixture are analyzed, and comparisons of model predictions and experimental data are in good agreement. This model exhibits sound performance in characterizing particle motion for wide ranges of concentration and shear rate, and may supply a reasonable and competent alternative to previous models developed for dilute and rapid-granular flows when applied to moderately concentrated situations. The concentration approaches zero (C → 0) asymptote is observed at a relatively high shear rate in model predictions. Assumption of low collisional dissipation of the particle phase as C → 0 is more reasonable for this observation, compared to that without the interstitial fluid effect. Accurately modeling energy dissipation is important for characterizing the stability of dilute simple shear flows of solid-liquid mixtures. Incorporating friction forces will also facilitate improvement of the applicability of this generalized model to flows at extremely high concentrations.

关键词： Constitutive relations Kinetic model Two-phase flow Turbulent diffusion Collisions Stress Concentration Shear rate

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Hydrologic and hydraulic characteristics of the Yellow River and impact of flow and sediment diversion

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Acta Geochimica 2006年第S1期 168-169页

作者： Dong wang1, Shaoming PAN2. Jichun WU1, Qingping ZHU3, Chang LIU1 1 department of Earth {2., Nanjing university, Nanjing 2.0093, china 2.The key lab of ministry of education of Coast & Island Development, Nanjing university, Nanjing 2.0093, china 3 The Yellow River Conservancy Committee of ministry of {{12. Resources, Zhengzhou 450003, china

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COUPLING RELATION OF THE PROCESSES IN SLOPE EVOLUTION

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International Journal of sediment Research 2003年第2期 336-347页

作者： Peng HAN,xingkui wang,Weiling SUN,Jinren NI department of hydraulic and Hydropower {2. department of hydraulic and Hydropower {2. department of Environmental engineering Peking university department of Environmental engineering Peking university The key {2.oratory for water and sediment sciences ministry of education Beijing 100871 china The key laboratory for {2. and sediment sciences ministry of education Beijing 100871 china The key laboratory for {2. and sediment sciences ministry of education Beijing 100871 china

A series of experiments was conducted to examine topographical variation, runoff erosion, and ion transport processes to explore the coupling relation of the different processes in slope evolution. The series includes 9 sequential experiments. In the first experiment, air-dried, crushed, and sieved loess was incrementally packed into a laboratory flume 5-m long and 1.5-m wide to a depth of 0.8 to 2.6 m. Copper nitrate (Cu(NO3)2.was mixed evenly in the top 0.2.m layer. The initial slope of the hillslope surface relief in the first experiment is 2. degrees and the initial slope of the latter experiments is the terminal relief of the former experiment. Simulated rain, applied at 90 mm/h for 90 min, was held constant in each experiment. The measured items in the experiment included slope elevation, sediment transport rate, and {2. discharge as well as dissolved and exchangeable nitrate (NO3-N) and copper ion (Cu2.). It was found that the sediment transport process was highly related to the topographical variation at different positions on the slope. further analysis indicates that headcut erosion is highly related to the area draining to the rill head and landslip generally occurs at a bank with a gradient more than 65 degrees. However, the ion transport process is directly related to the processes of runoff and soil erosion rather than to the topographical variation process. Most NO3-N runs out with {2., with infiltration at first and then with runoff, while the loss of Cu2., which is affected by the pH of the solid-liquid system, is mainly determined by sediment transport owing to the different characteristics of NO3- and Cu2..

关键词： Slope evolution process Coupling relation Rills

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Hydrologic and hydraulic characteristics of the Yellow River and impact of flow and sediment diversion

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Chinese Journal Of Geochemistry 2006年第B08期25卷 168-169页

作者： Dong wang Shaoming PAN Jichun WU Qingping ZHU Chang LIU department of Earth sciences Nanjing University Nanjing 210093 China The key lab of {2. of education of Coast ＆ island Development Nanjing University Nanjing 210093 China The Yellow River Conservancy Committee of ministry of water Resources Zhengzhou 450003 China

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