层流

Based on Prandtl's momentum transportation, this paper calculates in detail the physical quantities such as eddy viscosities, and ratio of eddy viscosity to motion viscosity, total stresses with respect to relative position in three regions of viscous sub-layer, buffer layer, and main turbulent stream for non-Newtonian fluid flowing turbulently in ducts, which according to Karman's three layer models and measurement of fluid parameters in evaluation apparatus, discusses the influence of polymer drag reduction on flowing properties of non-Newton fluid, analyzes quantitatively principle of turbulent reduction phenomenon and condition of increasing reduction rate.

摘要以普兰德动量传递理论为基础，按照卡门的三层模型，通过室内模拟环道用0号柴油及加入减阻剂在圆管内的流动参数的测定，计算了非牛顿型流体管内湍流边界层的层流内层、过渡层、湍流中心的涡流粘度，涡流粘度与运动粘度比、总应力随相对位置的变化等定量参数，探讨了高分子减阻剂对非牛顿流体流动特性的影响，对湍流减阻现象的机理与增大减阻率的条件进行了定量分析。

Flame stability were analyzed by using Markstein length, and density ratio of unburnt gas to burnt gas at two sides of the flame front as well as flame thickness.

本文在定容燃烧弹内研究了初始压力为0.1MPa，初始温度为285K下掺氢天然气-空气-氮气稀释气体混合气的火焰传播规律，得到了在不同掺氢比、氮气稀释度和当量比下的无拉伸层流燃烧速率，并通过Markstein长度以及火焰密度跳动和火焰厚度分析火焰的稳定性。

The coefficient V can be named as the dimensionless layer flowing factor, means the ratio of surface coefficients irrespective of production over the total surface coefficients among the maximum surface coefficients under the condition of unideal flow. Obviously, 1-V represents the ratio of the surface coefficients relating with production rate over the total surface coefficients.

系数V可称为无因次层流系数，它表示在所有非理想流动条件下的最大总表皮系数中，与产量无关的表皮系数所占的份额，对应的1-V则是代表与产量有关的表皮系数所占的份额。

Simulation of the motion of a solid particle in a vertical in-tube liquid upflow.

利用计算机对单个颗粒在竖直向上层流、紊流、及蒸汽产生条件下的竖直向上管流流场中的运动规律进行了分析计算。

The numerical solution shows that the optimal velocity field for laminar convective heat transfer in tubes is multi-longitudinal vortex flow.

数值求解表明，管内层流对流换热的最优速度场为多纵向涡流态。

The use of the formula for calculating the grain diameter indensimeter method prescribed in "Standard for soil test method" GB/T 50123—1999 is limited to the small global grains with low velocity in a layer flow considering only the viscous resistance and effective gravity.

GB/T50123—1999《土工试验方法标准》中采用密度计法进行颗粒分析时，土粒粒径计算公式是在层流条件下，对低速运动的微小球形颗粒仅考虑介质粘性阻力和有效重力条件下导出的。

In this paper,a one-dimensional turbulent ignition model of the pulverized coal air flow in a bube is established on the basis of the one-dimensional plane laminar flow ignition model .

在一维平面层流煤粉气流着火模型的基础上，提出了一种一维平面紊流煤粉气流的着火模型。

So the control accuracy of the coiling temperature has been improved effectively.

本文具体的工作内容如下：提出了层流冷却过程的动态模型。

Charles has presented an analysis of the concentric flow of long cylindrical capsules carried in an equidensity liquid in laminar motion.

查尔斯已对载运于等密度液体中，以层流运动的长圆柱形包囊的同心流动提出了分析。

On the assumption that the fabric pores can be considered as parallel capillaries of equal length and radius, and that the flow in the pores is laminar, two filtrability index equations under constant head action are derived and discussed.

在滤网孔隙可视为平行等长等半径毛细管和孔隙内流态为层流的假定下，推导并讨论了恒水头作用下的两过滤指数公式。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。