基于破碎与融合效应的弹状流理论建模

Molding of slug flow considering bubble breakup and coalescence

针对现有弹状流理论模型忽略气泡破碎与融合效应而无法准确预测水动力学特性难题,建立基于破碎与融合效应的弹状流理论模型。分析泰勒气泡湍动能和表面张力能,推导泰勒气泡破碎的理论公式。基于气相质量守恒,提出气泡融合理论模型,结合破碎公式、融合模型以及经典的弹状流理论,形成了考虑气泡破碎与融合效应的弹状流理论模型。搭建弹状流实验装置,基于高速摄影法测量泰勒气泡速度,对比研究新建理论模型、传统模型与实验数据的吻合度。结果表明:新建模型与实验数据一致性好,误差范围为12%,较经典理论模型提高了7%。证明考虑气泡融合与破碎效应的新建模型较现有理论模型更合理。

A slug flow model was proposed by considering bubble breakup and coalescence which were ignored in traditional models with lower predicting accuracy.A theoretical formula for Taylor bubble breakup was derived based on its turbulent kinetic energy and the surface tension energy,and a coalescence model was developed based on a gas mass conservation.Then,a closure slug flow model was established by combining the bubble breakup formula,coalescence model and classic slug flow theory.The experiments were conducted to measure Taylor bubble velocity using a high speed camera,and test data were used to compare the accuracy of the established model and traditional modes.Results show that the established model has good agreement with experimental data in an error range of 12%,which is 7%lower than the traditional model,proving the necessity of considering bubble breakup and coalescence.