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本文把粘稠油液环输送分成三种流动状态:液环和核心油均为层流;液环为湍流,核心油为层流,液环和核心油都为湍流。文中导出了区分这三种流态的判据,判据的应用不受液环厚度的限制。得到了这三种流态下的速度分布和流量计算公式,其应用范围是0.5≤K<1,K是半径比。由力平衡关系推出了偏心液环的偏心率的定量表达式,指明增加低粘液体的粘弹性和速度,减小液环厚度,是减小偏心的有效方法。文中还提出用输油效率的概念来比较液环输送与普通管输的优劣。找到了最佳油水比。理论与实验都证明,液环输送的输油效率很高,而且特别适于输送其它方法难以输送的高粘高凝原油。
In this paper, the viscous oil ring is divided into three flow states: the liquid ring and the core oil are both laminar; the liquid ring is turbulent, the core oil is laminar, and the liquid ring and core oil are turbulent. The criterion for distinguishing these three flow regimes is derived in this paper, and the application of criterion is not limited by the thickness of the liquid ring. The formulas of velocity distribution and flow rate under these three kinds of flow regimes are obtained. The range of application is 0.5≤K <1 and K is the radius ratio. The quantitative expression of the eccentricity of the eccentric liquid ring is deduced from the force equilibrium relationship. It is an effective way to reduce the eccentricity by increasing the viscoelasticity and velocity of the low viscous liquid and reducing the thickness of the liquid ring. The paper also proposed the concept of oil efficiency to compare the merits of liquid ring delivery and ordinary tube delivery. Found the best ratio of oil to water. Both theory and experiment prove that liquid ring conveying has high oil transportation efficiency and is especially suitable for conveying high viscosity and high coagulation crude oil which is difficult to be transported by other methods.