管道内气液两相泡状流k-ε-k_g-ε_g模型

New Turbulence Model for Gas-Liquid Two-Phase Bubbly Flow

从标准的单相湍流k ε模型出发 ,提出了一个任意非正交曲线坐标系下模化管道内气液两相泡状流的湍流k ε kg εg 模型 .在该模型中 ,气泡湍动能的耗散受其自身耗散方程的制约 ,并全面考虑了气泡湍动能本身的对流、扩散、生成和耗散以及与液体之间的耦合作用 .该模型在理论上比k ε模型和k ε kp 模型更加完善 .采用该模型的数值模拟结果与试验数据吻合良好 ,二者相对误差在计算范围内不超过 2 0 % .

Based on the standard single phase turbulent flow model, a new turbulence model is put forward to model the gas-liquid two-phase bubbly flow in a general non-orthogonal curvilinear co-ordinate system. In this model, the dissipation of the turbulent kinetic energy of gas bubbles is governed by the dissipation equations of the gas bubbles. The convection, diffusion, production and dissipation of the turbulent kinetic energy of bubbles, and the coupling interaction between the mass, momentum, and energy of two fluids are taken into account. Theoretically speaking it is a more perfect model than the k-Ε or k-Ε-kp. predicted results by using this model for the gas-liquid two-phase flow in a straight duct are in satisfactory agreement with the experimental data in the literature, with a maximum relative deviation of less than 20% within the investigated range.