圆管内层流脉动流动相位差分析

为研究圆管内脉动流的流动特性，通过建立数学模型，对圆管内低频率层流脉动流动中流量与压差间的相位差进行了分析。研究结果表明：低频率流量脉动未引起流体的速度径向分布变化，压差与流量之间存在相位差，相位差只与通道直径、流体黏性及脉动频率相关，脉动频率及流道半径越大，相位差越大，加速度是导致相位差出现的主要原因。

Phase Lag in Laminar Pulsating Flow in Circular Pipe

To study the flow characteristics of pulsating single-phase laminar flow in circular pipes, a mathematical model was established to study the phase lag which is exist between the pressure drop and flow rate. The results show that the low frequency flow rate pulsation does not arouse the distortion of velocity distribution; however, there is a phase lag between the pressure drop and flow rate, and the phase lag is related to the radius of the pipe, fluid viscosity and the pulsating frequency. The bigger the pulsating frequency or the radius is, the larger the phases lag is. In addition, the phenomena were discussed based on the mathematical model.