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Developed ‘laminar' bubbly flow with non-uniform bubble slzes

机译:产生带有不均匀气泡的“层状”气泡流

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摘要

Bubbles with different sizes have different dynamic and kinetic behavior in a two-phase bub- bly flow. A common two-fluid model based on the uniform bubble size assumption is not suitable for a bubbly flow with non-uniform bubble sizes. To deal with non-uniform bubbly flows, a multi-fluid model is established, with which bubbles are divided into several groups according to their sizes and a sat of ba- sic equations is derived for each group of bubbles with almost the same size. Through analyzing the bubble-bubble and bubble-pipe wall interactions, two new constitutive laws for the wall-force and pres- sure difference between the liquid phase and interface are developed to close the averaged basic equa- tions. The respective phase distributions for each group of bubbles measured by a specially designed three-dimensional photographic method are used to check the model. Comparison between model-pre- dicted values and experimental data shows that the model can describe laminar bubbly flow with non-uni- form bubble sizes.
机译:不同大小的气泡在两相气泡流中具有不同的动力学和动力学行为。基于均匀气泡大小假设的常见两流体模型不适用于气泡大小不均匀的气泡流。为了处理不均匀的气泡流,建立了一个多流体模型,该模型将气泡根据其大小分为几组,并为几乎相同大小的每组气泡导出了一系列基本方程。通过分析气泡-气泡和气泡-管壁的相互作用,开发了两个新的壁面力和液相与界面之间的压力差的本构律,以封闭平均基本方程。通过特殊设计的三维摄影方法测量的每组气泡的各自相位分布用于检查模型。模型预测值与实验数据之间的比较表明,该模型可以描述具有不均匀气泡尺寸的层状气泡流。

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