U型中空纤维膜水力特性的模型分析

依据水力学原理，建立了竖立式U型中空纤维膜出水量及内压的数学模型，对其结果的理论分析表明：在相同的水头作用下，纤维膜流量随距出水口距离的减小而呈比例增加，但在出水水头较高时，增加的速率要大于出水水头较低时增加的速率；类似地，在纤维内部的不同位置，流量随出水作用水头的增加而增大的速率也是不同的，离纤维出口越近，这种速率的增加就越快，越明显．因此，要想增大出水流量，应尽量提高出水的作用水头，另外还可以在一定范围内增加纤维的长度；纤维内压随距出水口距离的减小而迅速减小，曲线呈类抛物线的形状；离出水口越远，纤维内压随出水水头的增大而增加的速率越大；流量与内压成直线关系，纤维内部距出水口越近，内压随流量增加而增加的梯度越小；由于液体黏度的影响，温度升高，流量增大；但温度越高，流量的增加梯度越小。

Hydraulic characteristics model of U-shape single hollow fiber membrane

According to the hydraulics theory, a mathematical model was built up to describe the water flow rate produced by and internal pressure in a U-shape single hollow fiber membrane. The results showed that the rate of flux increased with decreasing the distance to the outlet under the same effluent water head. Similarly, the flux increased more fast with the increasing of the effluent water head at the site which is more close to the outlet.It means that flow rate can be increased by raising water head of effluent as well as lengthening the fiber to a certain extent. The internal pressure in fiber decreased quickly with decreasing the distance to the outlet. The gradient of internal pressure augmented with the increasing of flow rate at the site which is more close to the outlet. The influence of temperature on flow rate was also studied.