...Low velocity;Non Darcy flow;Gas well;Well testing;Boundary condition;Laplace transform;Iteration.; 低渗透油气藏;低速;非达西渗流;气井;试井;边界条件;拉普拉斯变法;迭代法; Patience is a sine qua non for a good teacher.
First through a lowvelocity core, and then through a high velocity shell, where their speed is increased before they are transmitted into the surrounding seawater.
To prevent clogging of the pressure tap by fine solids gas is bled into the bed at lowvelocity at the taps .
为了防止测压管嘴被微细颗粒堵塞，在管嘴处以低流速向床内注入气体。
3
In medical Doppler ultrasound systems, a high-pass filter is usually employed to remove wall clutter components which may also remove the information of the lowvelocity blood flow.