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首页> 外文会议>ASME/JSME Joint Fluids Engineering Conference >THE MODELING OF LIFT AND DISPERSION FORCES IN TWO-FLUID MODEL SIMULATIONS. PART-Ⅱ: BOUNDARY LAYER FLOWS
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THE MODELING OF LIFT AND DISPERSION FORCES IN TWO-FLUID MODEL SIMULATIONS. PART-Ⅱ: BOUNDARY LAYER FLOWS

机译：两种流体模型模拟中提升和分散力的建模。第Ⅱ部分：边界层流动

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Two-fluid model simulations of a bubbly vertical boundary layer with point injection are presented. A new bubble turbulence dispersion model, designed to be used with RANS type turbulence models, was formulated and compared with recent data of [ 1 ] and [2]. These data showed that bubble migration toward the wall is controlled by the coherent large scale liquid structures within the boundary layer. The model is based on the application of a kinetic transport equation, similar to Boltzmann's equation, and the idea that by selectively removing bubbles from the liquid eddies within the boundary layer, bubble capture at the wall introduces a preferential direction of migration and/or non-homogeneous, anisotropic dispersion. This is the first model capable of predicting all the types of void fraction profiles observed experimentally for point injection. It is shown that without this new model, two-fluid model simulations fail to predict the experimental data. In addition, a new physical interpretation of the data of [1 ] and [2] is presented, which strongly suggests that the quantity controlling bubble migration toward the wall and bubble dispersion, is the boundary layer drift parameter (i.e., the ratio of the bubble's terminal velocity to the free-stream liquid velocity).
机译：提出了具有点注射点的双流体模型模拟。设计用于与RAN型湍流模型一起使用的新泡沫湍流分散模型，并与最近的[1]和[2]进行比较。这些数据表明，朝向壁的气泡迁移由边界层内的相干大规模液体结构控制。该模型基于动力传输方程的应用，类似于Boltzmann的等式，以及通过选择性地从边界层内的液体漩涡中取出气泡，壁上的气泡捕获引入了迁移和/或非的优先方向 - 均匀，各向异性分散体。这是能够预测实验观察到的点注射观察到的所有类型的空隙率分布的模型。结果表明，没有这种新模型，两种流体模型模拟无法预测实验数据。另外，提出了对[1]和[2]的数据的新物理解释，该数据强烈建议控制朝向壁和气泡分散的气泡迁移的量，是边界层漂移参数（即，泡沫的终端速度与自由流液体速度）。

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