脉冲电场作用下W/O乳状液中水滴变形的数值模拟研究

油包水型乳状液使原油的品质降低,增加原油在收集、储存及运输过程中的负荷。脉冲电场破乳,能有效避免水链形成。对脉冲电场作用下的液滴运动规律进行模拟,建立液滴在脉冲电场作用下的物理模型和乳状液界面动力学模型;研究了脉冲电场中乳状液的电场强度、占空比、介电常数等参数对液滴变形行为的影响;针对脉冲电场中乳状液的电场强度、分散相水滴的受力以及各电场参数,研究水滴变形的作用机理,得到水滴变形速率方程,该方程能够较为客观地反映出脉冲电场作用下水滴的变形规律。     

微通道内单相水流动与换热的特性研究

微通道传热技术是近几年发展起来的一门新兴的传热技术,具有传热效率高、结构紧凑等优点,是当前流动与传热研究的重要课题。运用计算流体力学程序(CFX)对环形微通道内单相水的流动与换热进行数值模拟,可以形象地描述出管内的流场和温度场,从中分析各种因素对流动与换热所产生的影响。     

数值试验在岩石力学实验教学中的应用

讨论了传统岩石力学课程教学存在的局限性，介绍了数值试验的基本原理和方法，利用计算机数值模拟方法实施岩石力学数值试验，自主开发研制了岩石力学破坏过程分析系统RFPA(Rock Failure Process Analysis的简称)及其教学版，对岩石力学实验进行辅助教学。该系统(教学版)已在岩石力学实验教学中进行了2—3学年的教学尝试，取得了较为明显的教学效果。     

Oseen流动中粘性对自由表面波的影响

Based on the complex dispersion relation for the two-dimensional free-surface waves generated by a moving body in the steady Oseen flows, the effect of viscosity on wavelength and wave amplitude was investigated by means of an asymptotic method and a numerical analysis. A comparison between the asymptotic and numerical analysis for the viscous decay factor demonstrates the validity of the perturbation expansions for the wave profile. The numerical result shows that the wavelength of viscous wave is slightly elongated in comparison with that of inviscid wave.     

Flow Field of Circulating Fluidized Bed Reactor with Venturi Inlet Configuration

Different two-equation k-ε models were used to simulate the gas flow field generated by a new type of circulating fluidized bed reactor with venturi gas distributor. The numerical results were compared with the experimental data. It has been shown that the simulation results from the standard k-ε model have the best match with the experimental data. Based on this model, the gas flow field in the venturi diffuser and riser was analyzed by the concept of velocity nonuniformity and dead zone percentage. Both the nonuniformity of gas velocity and the dead zone percentage reach the maximum at the venturi outlet due to the effect of the vortex. At the same time, it provides a good platform for the further optimization of the inlet configuration of circulating fluidized bed reactor.     

原子量教学中的问题探究

本文对原子量的的基准变革，原子量的“单位”问题、原子量数值的修订等进行了讨论。     

国际岩石力学学会主席Hudson教授访问材料破坏力学数值试验研究中心

应大连大学材料破坏力学数值试验研究中心主任唐春安教授邀请，《International Journal of Rock Mechanics and Mining Sciences》主编，国际岩石力学学会主席、英国皇家工程院院士、英国帝国理工学院J.A.Hudson教授于2006年10月27日参观访问了材料破坏力学数值试验研究中心，     

用改进的元胞自动化模型模拟不同信号灯控制策略下的交通流

Traffic flows controlled by traffic light strategies were investigated via a cellular automaton model with anticipation, which is suitable for describing urban traffic. Three kinds of strategies, i. e., synchronized, green-wave and random switching lights, were designed, simulated and compared with each other. It is shown that the green-wave strategy is only valid at lower density and there is not an effective way with the three strategies to improve the efficiency of traffic flow at high density.     

例谈线性规划学习中的几个误区

误区一:最大整数解就是目标函数取最大整数值.【例1】　已知x,y满足不等式组2x-y-3>02x+3y-6<03x-5y-15<0　求x+y的最大整数解.错解:依约束条件画出可行域如下图所示由3x-5y-15=02x+3y-6=0解得x=7519y=-1219∴x+y=7519-1219=6319,∴x+y的最大整数解为3.点击:错误主要原因是把目标函数的最大整数值与最大整数解混为一谈,最大整数解是使目标函数取得最大值时的整数解,显然,此时的最大值一定是整数值.正解:于错解的前部分过程相同,∴x+y=6319=3619.∴令x+y=3则y=3-x代入可行域解得3相似文献   

相对论性非磁化等离激元色散关系的数值解

对处于相对论性振荡的无磁化等离子体中的纵、横等离激元色散方程进行数值求解,得到比较全面的色散关系图像.在极端相对论情况下,我们的数值计算结果与解吸结果吻合.同时,将我们的计算范围扩展到适中相对论温度以及弱相对论温度,得到完全相对论性无磁化等离子体色散关系图像.最后,根据等离子体的色散特性,对不同温度下的色散曲线进行数值拟合,得到了色散关系数值解.