幂律流体流流动指数对其湍流流动的影响

Turbulent Flow of Power Law Fluid under the Influence of Flow Exponent

考虑到幂律流体的本构关系 ,结合流动指数的影响 ,建立了适用于幂律流体的N S动量方程和湍流模型方程 .采用压力耦合半隐式SIMPLE算法 ,对不同流动指数的幂律流体湍流流动进行了数值计算 ,计算结果与实验数据比较吻和 .对计算结果进行分析后发现 ,对于不同流体指数的幂律流体 ,其湍流流动的变化趋势不同 ,从而揭示了幂律流体的流动指数对其湍流流动有重要的影响 .

Turbulent model of power law fluid is presented according to Power Law fluid constitution equation and the influence of flow exponent. Using semi-implicit method for pressure-linked equations,the numerical computations are worked out for power law fluid. The result is satisfied with the experiment. Analysis of the result indicates that the variation tendency of power law fluid turbulent flow is varied according to the variation of flow exponent. It is concluded that the material parameter —flow exponent has an important influence upon turbulent flow.