过渡流

3根据对试验中水力参数的统计特性分析结果，论述了SPRT法对过渡流的识别和压力梯度法进行漏点定位在输水管道中的应用，并在试验管道中得以验证，收到较好的效果；

According to the result of the statistical characteristic analysis , author applies SPRT method to identify the transition flow and the hydraulic grade line method to leak localization in experiment pipe .

在过渡流区域，选用不同的方法进行模拟，与文献数据比较，对比分析各种方法在这一区域的特点。

Three different methods were used for the simulation of the transition flow region .

盘型分子泵3D过渡流特性

Simulation of 3D Transient Flow Characteristic of Disk-Shaped Turbo-Molecular Pump

气体-固体界面的二阶滑移边界条件将N-S方程的适用范围扩展到过渡流区。

Second-order slip boundary condition is used to extend the application scope of Navier-Stokes equations into the transition regime .

结果表明，螺旋扭扁管是一种较好的强化传热元件，尤其对具有高Pr数的大粘度流体在低Re数的层流或过渡流时具有较好的强化传热效果。

The result shows that the spiral twisted flat tubes were comparatively good enhanced heat transfer components , they had better enhanced heat transfer result , particularly to the high viscose flow with high Prandtl number in laminar flow with low Reynolds number or transition flow .

交叉三角形波纹板流道在过渡流状态下的传热与阻力特性

Transitional heat transfer and resistance properties of cross - Corrugated triangular ducts

城市排水管网明满过渡流模型的研究及应用

Study and Application of Free-surface-pressurized Flow Mathematical Model for Urban Drainage Networks

螺旋槽式涡轮增压泵过渡流分子运动规律分析

Analysis of Molecular Motion Law of Transient Flow of Spiral-grooved Turbo Booster Pump

球双锥外形稀薄过渡流区气动特性研究

Aerodynamic characteristics of rarefied transitional flow around sphere-bicone configuration

分子泵中螺旋通道在过渡流和滑流态抽气特性的研究

The Helical Channel Pumping Mechanism of Molecular on Transition and Higher Pressure Regime Flows

液压系统内过渡流数值预测中的计算机应用

An application of computer in the numerical preduction of transition flow in hydraulic system

发现其对流蒸发传热中有时处于过渡流状态。

It was found that the convective evaporation heat transfer sometimes was in a transitional flow state .

研究结果表明，坡面薄层水流流态与水深密切相关，坡面流的流态基本上呈过渡流和紊流；

The results indicated that there is deeply relationship between the flow regime and the flow depth .

三维内肋管内流态的划分及过渡流判据的实验研究

Experimental investigation of division for flow patterns and Reynolds criterion for transitional flow in 3-D internally finned tubes

结果表明，有草被覆盖的坡面薄层流的流态基本上呈过渡流和紊流；

The result shows that : the flow on slope covered by grass is turbulent flow or transition flow ;

将纵向涡强化换热技术应用于矩形管槽，研究以水为换热介质在过渡流状态下的换热效果。

Heat transfer in rectangular pipe with longitudinal vortex generators were investigated under transitional flow using water as working fluid .

分别求取得到了层流、过渡流和旺盛湍流三种流态下的换热和流阻准则方程式。

On Network Flow Got the empirical equation of heat transfer and flow resistance in laminar , transitive and turbulent zone .

提出了关于变偏心度环空中计算非牛顿流体在层流、过渡流及紊流状态下压降、流速的方法；给出了流场特性分析及数值模拟结果。

The method is presented to simulate pressure losses and flow velocities in skewed narrow annular geometries for laminar , transition and turbulent non-Newtonian flow .

在底水油藏中，水平井流动期为井筒径向流→过渡流→稳态流；

In a reservoir with a bottom water boundary , the flow regimes are : well bore radial flow → transitional flow → steady flow ;

计算结果表明，在过渡流区采用不同的方法计算得到的功率准数基本相同。

The simulation result shows that the power number , which was calculated by different methods in this region , was closed to each other .

在试验的坡度和流量范围内，径流雷诺数的变化范围基本上属于层流到紊流的过渡流范围，在流量较大时其流态也进入紊流状态。

Generally , the Reynolds number of the flow varies between the laminar and turbulent flow , which tends to be turbulent flow with large discharge of flow .

利用这一手段，对滴流床中存在的三种典型流型：滴流，过渡流和脉冲流进行了压力脉动测量，并报道了压力脉动数据的直方图分析和谱密度分析。

With its help , the pressure pulsations of the three typical flow regimes existing in the bed which are trickling flow , transition flow and pulsing flow were measured .

利用周期性降低几何流道的复杂性以及简化模拟对象。为了模拟这个拓扑结构中的过渡流，利用了已经验证的低雷诺数k-ε，湍流模型来说明流动中的湍流流动。

To model the transitional flow in the topology , a validated low Reynolds number k-omega ( LKW ) turbulence model is employed to account for the turbulence in the flow .

我们发现，在本实验条件下，层流边界层分离后在再附点处为过渡流，进一步发展最后形成湍流边界层。

It is found that , in the present experiment , the flow is transitional boundary layer at the reattachment position , which further develope until turbulent boundary layer was formed .

结合过渡流流域内流动的可视化结果发现，其流动不稳定性呈现出间歇性的特点，这是二维流路与三维流路最大的差异。

Flow visualization result indicates that the intermittent instability is completely different from that of in the two-dimensional channel . This is the most important difference between the wavy-walled channel and the wavy-walled tube .

微纳尺度气体流动中，流动进入滑移过渡流区，流场中缺乏足够的分子碰撞，流体逐渐偏离热平衡状态。

In micro - and nanoscale gas flows , the flow falls into the transition flow regime . There are not enough molecule collisions in the flow , so the gas deviates from the equilibrium .

研究还指出，在中等雷诺数下的过渡流流域内可以获得最佳的传递强化效果，在脉动流场下会发生共振强化现象。

Moreover , the studies showed that the optimum transport enhancement could be obtained at medium Reynolds Number in the transitional flow regime , the mechanism of resonant enhancement can be used to explain this phenomenon .

根据四个不同演替阶段林地中的优先流路径中的雷诺数值计算结果可知，贡嘎山高山生态系统中的优先流是处于层流及紊流之间的过渡流。

The Reynolds numerical calculation of the preferential flow path in the four different successive stages indicates that the preferential flow in Gongga mountain forest ecosystem is the transition flow between the laminar flow and turbulence flow .

电化学实验结果表明，壁面剪切应力和传质速率都随着雷诺数的增大而增大，但在不同的流域内其增大趋势不同，并且在过渡流流域内都存在着一个剧烈的突增。

Electrochemical experiment results show that the wall shear stress and the mass transfer rate increase with Reynolds Number , and there is a sudden increment in transitional flow regime , but the trend is different in each flow regime .

数值算例同样显示，二阶滑移的影响在过渡流区不可忽略；而在无滑移边界条件下，气体可压缩性的影响随着最小膜厚与球体半径比值的增加而增大。

Numerical examples indicate that a significant effect of the second-order slip occurs in the transition regime . It is also shown that the compressible effect under no-slip condition increases with the ratio of minimum gap height to sphere radius .