浮法玻璃熔窑三维数学模拟研究

采用SIMPLEC算法求解了玻璃熔窑三维数学模型的温度场和速度场 ,计算了不同卡脖宽度时的熔制因子分布和滞留时间微分分布曲线。研究表明 :在熔窑纵向存在 3个主要回流卡脖宽度变化对玻璃液流动产生影响 ,减小卡脖宽度有利于节能 ,但卡脖宽度过小会使玻璃熔制质量降低 ,当窑宽为 1 0 5m时 ,卡脖宽度在 4

结晶器三维数学模拟及在CaSO_4·2H_2O生产中的应用

文章介绍了二水硫酸钙结晶过程与结晶器研究现状,对基于Fluent软件的结晶器三维数学模拟研究的进展进行了综述,概述了其在三维数学模拟模型建立与优化研究中的应用,并对其在二水硫酸钙结晶器设计与优化研究中的应用进行了展望,表明基于Fluent软件的结晶器三维数学模拟在二水硫酸钙生产中具有巨大的发展潜力与良好的应用前景。

玻璃熔窑三维数字模拟的应用──投料池宽度变化对玻璃熔制质量的影响

利用建立的浮法玻璃熔制过程的数学模拟系统，研究了投料池宽度变化对玻璃液熔化质量的影响，通过改变投料池宽度得到不同的数据，分析发现了投料池内玻璃液对流情况、流场和温度场；宽度变化影响配合料的熔化，影响能耗。对等宽投料池作了仔细研究，发现等宽投料池并不是理想结构，比熔化池稍窄一点才是最理想的。

三维质子交换膜燃料电池的完整模型

通过聚集体模型描述催化层结构,建立了阴阳极包括蛇形流道、多孔扩散层、质子交换膜和催化层的完整质子交换膜燃料电池(PEMFC)三维流体力学模型,重点研究稳态条件下的基本工作参数分布和气体扩散层渗透率的影响.模型方程借助于计算流体力学软件-F luent求解.模拟的极化行为验证了模型的有效性,说明在燃料电池模型中充分考虑催化层的必要性.计算结果表明流体流速、压力、反应气体组成和局部电流密度等参数的空间分布明显,并且受气体扩散层渗透率影响明显,优化气体扩散层结构至关重要.

Research on 3D Distribution of Meandering River Sand Body Using Sedimentary Facies Method and 3D Geological Modeling

Sedimentary facies study is an important method in describing the property and distribution of reservoir. 3D geological modeling is a powerful tool in 3D characterization of geological bodies. By combining the sedimentary facies study with 3D geological modeling to generate 3D sedimentary facies model, the 3D geometry and distribution feature of sand bodies can be more accurately characterized, particularly in 3D view. In Liuchu oilfield of Jizhong depression, the Ed2IV formation was recognized as meandering river deposition facies and five sedimentary facies were identified, which include point bar sand, levee, channel margin, abandoned channel and floodplain. All the 24 sand body facies in Ed2IV were mapped and the 3D sedimentary facies model established based on 2D facies maps. The result shows that the 3D sedimentary facies model is well matched for the research result of sedimentary facies. Being an extension of traditional sedimentary study, the 3D sedimentary facies model can be used to describe the 3D geometry and distribution orders of a single sand body more reliably and more accurately.

Simulated circulations off the Changjiang (Yangtze) River mouth in spring and autumn

The circulations off the Changjiang mouth in May and November were simulated by a three dimension numerical model with monthly averaged parameters of dynamic factors in this paper. The area covers the East China Sea (ECS), Yellow Sea and Bohai Sea. Simulated results show that the circulation off the Changjiang mouth in spring and autumn is mainly the Changjiang runoff and Taiwan Warm Current (TWC). The Changjiang discharge is much larger in May than in November, and the wind is westward in May, and southward in November off the Changjiang mouth. The runoff in May branches in three parts, one eastward flows, the other two flow northward and southward along the Subei and Zhejiang coast respectively. The Changjiang diluted water expands eastward off the mouth, and forms a strong salinity front near the mouth. Surface circulation in autumn is similar to that in winter, the runoff southward flows along the coast, and the northward flowing TWC becomes weaker compared to that in spring and summer. The bottom circulations in May and November are mainly the runoffnear the mouth and the TWC offthe mouth, and the runoff and TWC are greater in May than in November.

Three-dimensional simulation of sintering crunodes of metal powders or fibers by level set method

The difference of sintering crunodes of metal powders and fibers is discussed. The mathematical model of the surface diffusion described by the difference in mean curvature is defined as a Hamilton-Jacobi-type equation, and the model is numerically solved by the level set method. The three-dimensional numerical simulations of two metal powders and fibers(the fiber angle is 0° or 90°) are implemented by this mathematical model, respectively. The numerical simulation results accord with the experimental ones. The sintering neck growth trends of metal powders and metal fibers are similar. The sintering neck radius of metal fibers is larger than that of metal powders. The difference of the neck radius is caused by the difference of geometric structure which makes an important influence on the curvature affecting the migration rate of atoms.

Operator health risk evaluation of off-highway dump truck under shovel loading condition

To evaluate the operator health risk exposed to whole-body vibration(WBV) while the electric-shovel loads the ore on the truck body, the semi-truck mathematical model and 3-D virtual prototype were built to simulate the high shockwave of truck cab under the shovel loading. Discrete element method was utilized to accurately estimate the impacting force on the truck body. Based on the ISO 2631-5 criteria, the Sed is about 0.56 MPa in both models, which means that the dump operators have a high probability of adverse health effects over long-term exposure to these vibrations. The 4-DOF operator model was built to investigate the biodynamic response of seated-human body exposed to WBV in terms of the transmission of vibrations through the body. The results show that the response peak is in the frequency range of 4-6 Hz corresponding to the primary body resonant frequency.

Numerical Modeling of Pulverized Coal Combustion at Thermal Power Plant Boilers

The paper deals with development and application the numerical model for solution of processes at combustion chamber of the thermal power plant boiler. Mathematical simulation is based on solution of physical and chemical processes occuring at burning pulverized coal in the furnace model. Three-dimensional flows, heat and mass transfer, chemical kinetics of the processes, effects of thermal radiation are considered. Obtained results give quantitative information on velocity distributions, temperature and concentration profiles of the components, the amount of combustion products including harmful substances. The numerical model becomes a tool for investigation and design of combustion chambers with high-efficiency and reliable operation of boiler at thermal power plants.