pressure equation

In consideration of the effect of liquid dynamic pressure on the tubing string vertical vibration, the differential equation and frequency equation for describing the vibration are set up.

考虑液动压力对油管柱纵向振动的影响，建立了油管柱纵向振动微分方程，并给出了这种情况下油管柱纵向振动的频率方程。

Based on the solution of velocity Langevin equation, constraints for temperature-density relation and for pressure-density relation are established, and the detailed calculation method is provided.

从求解速度朗之万方程出发，建立了系统的温度-密度条件和压强&密度条件，并给出了具体的计算方法。

We see the permeability and porosity, density and so on as the physical quantities which change with the time and pressure. On the basis of the equation of continuity, energy equation and motion equation, we establish the mathematical model of THM coupling.

将渗透率、孔隙度、密度等这些量看成是随时间和压强变化的物理量，在连续性方程、能量方程和运动方程的基础上，建立了热流固耦合的数学模型。

The complex pressure distribution in the model makes the fluid flow computation of horizontal well be fairly complicated, so the non-linear equation describing fluid flow performance has been applied for space iterative computation followed by time iterative computation.

由于所用气藏模型压力分布较为复杂，使得水平井的流动计算变得相当复杂，应用表征流动特性的非线性方程对空间进行迭代计算，再向时间推进。

A tapered tube variable area ring orifice device for wet gas measure is developed. It combines a tapered tube, an inner circle-shaped movable baffle, a precision spring and a displacement sensor. Flow equation is given, with distance displacement for pressure difference.

本文提出了一种锥形管变面积环孔装置，用于湿气计量，采用锥形管、内圆形可移动阻流件、精密弹簧和位移传感器组合的结构设计，给出了用位移代替差压的气体流量方程。

A study on a temperature correction equation for pressure-measuring copper cylinders

测压铜柱温度统一修正公式研究

The equilibrium coefficient can be calculated by Clausius-Clapeyron saturated vapor pressure equation in internal iteration.

内层迭代采用克拉伯龙饱和蒸汽压方程计算平衡常数.

As using the general Darcy's law instead of the momentum equation, we get two equations: the pressure equation derived from the continuity equation and the enthalpy equation from the energy equation.

通过引入广义的Darcy定律代替渗流的动量方程，最终得到两个全场求解的控制方程：连续性方程演化的压力方程和能量方程演化的焓方程。

The porous pressure modeling of grout can be gotten by combining porous seepage continuum equation and Bingham ′ s hydrodynamics equation.

三维应力作用下砂砾岩孔隙型渗流浆液孔隙压强方程可以通过将渗流连续性方程和Bingham流体运动方程联立获得。

An express describing the entry pressure variation for the sample flow in conical dies was presented by using the constitutive equation of the second-order fluid and a tensor analysis method.

采用二阶流体本构关系和张量分析方法，导出了预测聚合物熔体在锥形口型流动中压力变化的方程式。

Reynolds equations applied to sealed fluid hydrodynamic lubrication are derived from the continuity equation and momentum equation, and significant effect of every item to dynamic pressure was analyzed.

由连续性方程和动量方程出发，推导了适用于机械密封流体动压润滑的雷诺方程，并分析了各项对动压效应产生的意义。