规整填料内鼓泡流动的二维CFD模拟

Tow-dimensional CFD simulation of bubbly flow in structured packings

规整填料内鼓泡流动现象的研究对于开发新型气液传质与反应设备具有重要的指导作用。为此应用VOF(Volume of Fluid)多相流模型建立了描述规整填料内部鼓泡流动现象的二维模型,模型中考虑了影响气液两相流动的两个重要作用力:表面张力和气液相间作用力。模拟计算结果显示,气泡在上升过程中自身振荡,随着入口气速的增大,气泡形变程度增大,并且伴有气泡聚并现象发生。气泡上升过程中,气泡周围液体的速度增大,并且形成大小不同的旋涡结构,单点速度值的波动程度随气体入口速度的增大而增大。

Basic research of bubbly flow in structured packings is of great importance for the development of novel gas-liquid mass transfer and reaction equipments.Simplified two-dimensional model was constructed and the volume of fluid （VOF） method was used to simulation the bubbly flow in structured packings.In the proposed model,two source terms were added into the momentum transport equation to describe the effects of surface tension and interface interaction.The results indicated that the bubbles rising in a chain oscillated and coalesced with increasing of gas inlet rate.The velocity of liquid surrounding the bubble increased and vortexes of different scale were observed.The velocity at a fixed point in liquid fluctuated more and more frequently as the gas inlet velocity increased.