周明
,
李文采
金属学报
针对底吹气液两相流过程的非均匀性和气泡运动过程随机性,本文从理论上提出用气液分离流动模式处理气液两相流动的方法,建立了随机轨迹分离流数学模型。该模型在Lagrangian时间序列坐标系中分析气泡的流动特性,在Eulerian空间位置坐标系中描述液体的紊流流动过程;气液相间的相互作用以气泡源项的形式在Eulerian场中予以分析;气泡的轨迹由Monte Carlo随机采样方法确定。为便于与前人的工作相比较,本文还采用均相流模型进行解析计算。研究结果表明,本文提出的分离流模型理论上合理,其计算结果与实测结果比较一致。
关键词:
气液两相区
,
fluid flow
,
separated flow model
ZHOU Ming LI Wencai Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
A separated flow model with stochastical trajectories has been developed to describe the fluid flow in a bubble stirred ladle.The bubble dispersion,turbulent characteristics and gas-liquid interactions can be predicted by this mathematical model.The bubble flow as a dispersed phase is treated in a Lagrangian frame of reference and the analysis of the turbulent flow for liquid phase is conducted in a Eulerian field.The interactions between bubbles and liquid phases are considered as a bubble source term in the control equation for a continuous phase. The Monte Carlo sampling method is used to determine the bubble trajectories.The homoge- neous flow model is also taken into consideration so that it can be compared with the sepa- rated flow model.Numerical predictions using a water model of a ladle show that the pre- dicted results of the separated flow model agree satisfactorily with the experimental results, but the prediction of the homogeneous flow model are not in good agreement with the experi- mental results.
关键词:
gas-liquid phase region
,
null
,
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