流动模型

• The fluxion model of gas and the gas pressure formula were decided in the surrounding of bore wall firstly , and according to the relation of gas content and gas pressure , the theory calculation formula of gas loss quantity was deduced , and finally , the revision method of original coal gas pressure was brought
  摘要首先确定了孔壁周围瓦斯的流动模型及瓦斯压力表达式，进而根据瓦斯含量与瓦斯压力的关系，推导出了瓦斯损失量的理论计算公式，最后提出了瓦斯压力的修正方法。
• In analyzing the flow field , the limited difference method of partial differential equation is employed , and the differential form of the flows in the valve is derived . ~ while in the calculation of the limited difference method , it makes kinetic parameters of ~ t " , , ii , v and pressure of p separated
  为了数值模拟方便，本文简化溢流阀流动模型，以二维不可压缩粘性流动的navier - stokes方程作为流动控制方程，采用计算功能非常强大的matlab作为计算语言，运用有限差分法对流场内流动进行数值分析。
• 3 . the mathematical model for heat and mass transfer in the adsorbent bed is established , the porous of adsorbent , the flow of adsorbate in adsorbent , the characteristic of non - equilibrium adsorption are combined in the model , and a more accurate model of fluid flow in porous media - ergun model is adopted
  它综合考虑了吸附剂的多孔介质结构，吸附质气体在吸附剂内的流动，吸附的非平衡特性等，并且在吸附质气体流动模型的选择上，采用了ergun多孔介质流动模型，比常规的数学模型更全面准确地描述了吸附床传热传质的动态特性。
• Firstly , working theory and structure of concrete pump are lucubrated . and the flowing state of the concrete in duct is analyzed by virtue of the rheology theory . secondly , the flowing model of concrete in duct is established , with that , the pressure loss of concrete flowing in duct is analyzed , too
  论文首先对混凝土泵的工作原理和结构进行了综合分析；基于流变学原理，深入分析了泵送混凝土在输送管中的流动状态，建立了混凝土在管道中的流动模型，分析了混凝土在管道中流动的压力损失；基于运动学和动力学基本原理，对混凝土s管阀的运动学和动力学进行了分析。
• We also found that the rheological behavior of single layer gmt is isotropic . temperature and pressure method has great affection on the distribution of the fiber . second , we measure the pressure change under different molding rate and use extensional viscosities model and shear force model to analysis the data
  研究表明： gmt材料具有很好的充模流动性，流动过程中纤维毡保持一个整体； gmt材料挤压流动行为表现为各向同性；温度、压力制度对纤维的均匀分布影响很大： 2 )通过测量不同合模速率下压力变化，采用拉伸粘度模型( extensionalviscositiesmodel )和纯剪切流动模型( shearforcemodel )对数据进行分析，导出了描述gmt材料宏观行为的流变学参数。
• ( 3 ) in terms of flowing characteristic of drilling fluids on the roller screen , the flowing equations at the axis direction and the tangent direction and the flowing through the screen , and the continuously flowing equation of drilling fluids are built . the characteristic - difference equations of flowing model for drilling fluids are given and the theoretical analysis is made
  ( 3 )根据钻井液在筒式筛网上的流动特点，建立了筒式筛网上钻井液沿轴线方向流动、周向流动和透筛流动的流动方程，以及钻井液的连续流动方程，利用特征线法写出了筒式网上钻井液流动模型的特征差分方程，并作了理论分析。
• In this paper . flow properties of multistage fluidized - bed bioreactor with external circulation at a pilot scale is studied . according to characteristic analysis , the model of completely mixing reactor in series is introduced to characterize real reactor as a theoretical model . on the basis of analog computing analysis and discussion of theoretical model . by means of pulse tracer method , experiments on residence time distribution ( rtd ) have been done in different conditions including the change of tracer level , feeding flow rate and circulation flow rate . the result shows when the ratio of circulation flow rate and feeding flow rate amounts to at least 4 , the flow properties of multistage fluidized - bed bioreactor with external circulation at a pilot scale is very close to the model of completely mixing reactor in series . an amendatory model has been established by the regression method
  作者首先在对反应器进行特征分析的基础上，建立了描述中试规模多级外循环流化床生物反应器流动特性的串级全混流模型，并对理论模型进行了模拟计算分析和讨论，在此基础上，作者分别在无循环和有循环(改变示踪剂用量、流加流量和循环流量)的条件下，利用脉冲示踪法对一到五级串联外循环流化床反应器进行了停留时间分布实验，结果表明，在循环流量与流加流量的比值达到大于等于4时，中试规模多级外循环流化床反应器的流动特性接近串级全混流模型，通过数据回归拟合的方法，建立了中试规模一到五级串联外循环流化床反应器的流动模型。
• Studies of intersectional labor flow , ranging from the classical lewis ' model of " dual structure " population flow to todaro ' s model of three - sector population flow , have been conducted against the background of rapidly expanding industrialization , quickly developing cities and highly elastic demand for labor in cities
  摘要从刘易斯经典的“二元结构”人口流动模型到托达罗的三部门人口流动模型，对劳动力在部门间流动的研究都是在工业化迅速扩张、城市快速发展、城市对劳动力需求弹性很大的背景下进行的。
• In this article , constituting some the equations which reflect the flow law and building and applying many mathematical models of physical and chemical reactions in the the plasma ignition : applying k - two equations turbulence model to calculate the turbulence parameter supplying simplied reaction systerm model and applying eddy break - up model and p - i thermal radiation model . with these reasonable simplied modles , numerically simulating the flow field in the plasma ignition . during the numerical simulation , applying the body - fitted coordinates for the complex geometry of the computional field ; using the mixing format to disperse the equations ; applying simplec algorithm method to solve the equations ; using above models and methods , it can get flow field distribution ; including temperature , pressure , turbulent kinetic energy and its dissipation rate , turbulent viscosity , velocity , density . these results are significant to design and improve the plasma ignition
  本文旨在通过构造反映等离子点火器内部流动规律的基本方程组，建立描述等离子点火器内部的复杂物理化学过程机制数学模型：模拟等离子发生器内部燃烧的-双方程湍流流动模型；模拟气体燃料在燃烧时中化学反应的简单化学反应系统模型；模拟等离子点火器内部湍流预混燃烧的漩涡破碎模型；模拟等离子点火器高温燃气及其壁面的p - i辐射换热的模型等等，对模型进行一定的合理的简化，然后数值模拟等离子点火器内部流场的流动。