屈服假塑性凝胶模拟液直圆管流变和流动特性分析

Analysis of rheological properties and flow characteristics of yield pseudoplastic gel simulation in tubes

通过理论分析和试验研究,进行了某型凝胶模拟液在直圆管内的流变和流动特性研究。研究结果表明:该凝胶模拟液具有明显的屈服应力;由于屈服应力的作用,直圆管中心明显地分为剪切流动区和柱塞流动区,柱塞流动区半径与屈服应力成正比,与压力梯度成反比;当流量恒定时,沿程压降随屈服应力的增大而增大;当压力梯度保持不变时,流量随屈服应力的增大而减小。

With theoretical analysis and experimental investigations, the rheologieal properties and flow characteristics of gelled propellants were analyzed in this paper. The results show that： the experimental gelled propellants have obvious yield stress. There are obvious shear flow and plungercylinder flow in the pipe because of yield stress. The radius of the plunger-cylinder is in direct proportion to yield stress and inverse proportion to pressure gradient. When the flux is constant, the pressure drop increases with the increase of yield stress. When the pressure drop is constant, the flux decreases with the increase of yield stress.