毛细管束流变模型内壁粘附力的测量及影响因素研究

Measurement of the adhesive force at the internal wall of a capillary rheological model and its affecting factors

所研制的毛细管束流变仪可应用于很低的流速条件下(u=0.2cm·s-1)、牛顿流体通过内径200～530μm毛细管内壁的粘附力(Fw)的测量.实验结果表明,流体在微米级毛细管流动过程中,内壁表面上的粘附力对流动阻力的影响是很大的.在不同条件下,粘附力的变化趋势不同,由实测数据按边界层理论讨论了流体流速(u)、毛细管内径(D)、毛细管长度(L)、实验温度(T)和流体粘度(η)对粘附力的影响,实验条件基本符合化学驱油的工艺条件,所以其结果对化学驱油机理的研究具有指导意义.

A capillary rheometer has been developed and used to measure the adhesive force (F_W) at the internal wall of capillary bundles with internal diameter in the range of 200～530 μm when a Newtonian fluid is passing through at very low flow rate (u=0.2 cm/s). Experimental results showed that during the flow of the fluid through the bundle of μm capillaries, the adhesive force at the internal wall surface of the capillaries greatly affects the resistance to the flow, and trends of the changes in adhesive force vary with different conditions. Employing the measured data, the effects of flow rate (u), capillary internal diameter (D), capillary length (L), experimental temperature (T), and viscosity of the fluid (η) on the adhesive force have been discussed in accordance with the boundary layer theory. Since the experimental conditions accorded with the technological conditions of chemical flooding, it is believed that the results would have significance in the study of chemical flooding mechanisms.