在稳定流动中，质量通量是恒定不变的。
在稳定流动中，质量通量是恒定不变的。
熔体破裂（MF）是挤出成型的一种不稳定流动。
稳定流动的意思是说流体流动状态不随时间而变化。
Steady flow means that the way in which the fluid moves does not change with time.
管道中非稳定流动的分析方法主要有频域法和时域法。
The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis.
为解决这一问题，提出一种非稳定流动速度确定方法。
To solve this problem, this paper puts forward a method for obtaining unsteady flow velocity.
除了不稳定流动区域，计算结果与流场显示结果符合良好。
The results are in good agreement with those of the water tunnel flow visualization results, except the periodic and unstable flow.
分析结果表明，稳定流动时，达西流只是非达西流的一个特例。
The analysis shows that Darcy flow in steady fluid flow is only a special case of non-Darcy flow.
综合论述了维持高炉滴落带气液稳定流动的条件及前人的研究结果。
An experimental set up for simulating investigation of the phenomena of countercurrent flow of gas and liquids in the dropping zone has been established.
对近年来国内外关于熔体挤出不稳定流动现象的研究进展进行了介绍。
The research progress of the flow instabilities in recent years at home and a- broad is introduced in brief.
建立了井筒不稳定流动模型，提出了支撑剂影响下的混砂液摩阻计算方法。
Developed wellbore transient flow model and friction calculating method for the sand mixed fluids effected by propant.
这句话的意思是，在稳定流动的前提下，包含表皮因子的线性流方程的无因次形式。
The following is the equation for linear flow with skin, at constant rate, in dimensionless form.
在十字流膜滤的基础上采用不稳定流动方式，则压力驱动的膜过滤过程将得到强化。
The performance of pressure driven membrane processes may be significantly improved when unsteady fluid instabilities are superimposed on crossflow.
输油管道中油品的不稳定流动问题，可以采用各种数值法并借助计算机进行有效分析。
The unsteady flow in oil pipeline can be effectively analysed by use of different numerical methods as well as computers.
并完成了柴油机两级涡轮增压不稳定流动过程模拟计算程序的编制，实现了对过程的模拟计算。
The compiling of simulation calculation program for unsteady flow process of two-class turbocharged systems in diesel engines is completed in this paper.
结果表明，UHMWPS最显著的流变特征为超高的熔体粘度和低剪切速率下出现不稳定流动。
It was found that the rheological behavior of UHMWPS is remarkably characterized by its unstable flow at low critical shear rate and ultrahigh melt viscosity.
由实验与图像处理结果获得了“S”特性区的真实流态，讨论了“S”特性区不稳定流动的原因。
The flow patterns are analyzed according to the receorded video pictures. The unstable flow in S-shape characteristic region is discussed.
文章从动力学中固液耦合振动的角度出发，研究了油管柱内流体不稳定流动引起的油管柱振动问题。
A problem about tubing string vibration caused by the fluid unsteady flow inside tubing string is studied from the Angle of solid liquid coupling vibration in dynamics.
基于可压缩流体不稳定流动理论及地层流体渗流理论，建立了气体钻井过程中井筒瞬态流动的数学模型。
Based on the theory of unsteady flow of compressible fluid and the seepage theory of formation fluid, the mathematical model of the gas transient flow in the wellbore has been established.
举例分析在环空和钻柱内的稳定流动过程中，随井深增加，压力、含气率、多相流体密度等的变化规律；
The steady-state flows in drill pipe and in annulus are analyzed and the variations of pressure, gas void fraction, and multiphase-flow density along the well depth are simulated.
在稳定的多分支管道流动中，对于相同的主管道流量，各分支管道中可以有不同的稳定流动状况与之对应。
In the steady flow in manifolds, there exist a number of stable flow states in the branches for the same main duct flow rate.
液体在长输管道内不稳定流动问题可以采用各种数直解法并借助计算机来进行处理，如特征线法、隐式差分法等。
Numerical method for computer solution are used for fluid flow in long distance pipeline, such as characteristics method, implicit difference method and so on.
试验测定振动助流时散体颗粒在初始阶段和稳定流动阶段的振动加速度信号，并对流动场中波的传播规律进行分析。
The vibration acceleration signals at initial stage and steady stage in flowing granular media are tested, and the propagation of wave in the flowing field is analyzed.
作者应用不稳定流动计算机模拟方法，不仅能估算排气消声器特性，还能模拟不同消声器结构对发动机性能的影响。
With the computer simulation of exhaust mufflers and IC engines, the influence of mufflers on engine performance as well as exhaust noise can be predicted.
然后应用数学物理方法，经过一系列的数学演算过程，最后得出描述各类环形管网内气体不稳定流动规律的数学表达式。
After making a lot of mathematical calculations by use of the mathematical-physical method, the formulas describing the gas unsteady flow in various loop networks are obtained.
同时还对拟稳定流动气井产能公式进行推导，推导出考虑高速非达西渗流、不考虑高速非达西渗流的采气指数的表达式。
Then from the expression of gas well deliverability in pseudo-steady state flow, there can have the expression of gas PI with and without high speed non-Darcy percolation.
根据流体力学的原理，任何系统都趋向于处在能量最小的稳定状态，所以在环状流的稳定流动状态下具有的能量应该最小。
According to the principle of the fluid mechanics, any system all tend towards to minimum steady state of energy, so the energy in steady flow of annular flow will be minimum.
研究了微可压缩流体在斜井内的不稳定流动状态，给出了数学模型，推导出了油井的完善程度和油井倾斜造成的表皮因子的计算式。
This paper analyzes the unsteady-state flow of a slightly compressible fluid into a slanted well and gives an equation for calculating the partial penetration and slanting of a well.
为探索闪急沸腾喷雾的形成机理，以氟里昂R12为试验掖体，采用激光多普勒测速仪（LDA）测量了稳定流动条件下粒子的速度分布。
In order to understand flash boiling injection, the drop velocity distribution in steady spray of freon R12 as test liquid was investigated by using LDA technique.
为探索闪急沸腾喷雾的形成机理，以氟里昂R12为试验掖体，采用激光多普勒测速仪（LDA）测量了稳定流动条件下粒子的速度分布。
In order to understand flash boiling injection, the drop velocity distribution in steady spray of freon R12 as test liquid was investigated by using LDA technique.
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