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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >CFD simulation of a turbulent fiber suspension flow – a modified near-wall treatment
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CFD simulation of a turbulent fiber suspension flow – a modified near-wall treatment

机译：湍流纤维悬浮液流的CFD模拟–改进的近壁处理

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Turbulent Eucalyptus fiber suspension flow in pipes was studied numerically using commercial CFD software. A pseudo-homogeneous approach was proposed to predict the flow behavior of pulp fiber suspensions for medium consistencies and for Reynolds numbers ranging from 4.7÷65.3·103. Viscosity was introduced into the model as a function of shear rate to represent the non-Newtonian behavior of the pulp suspension. Additionally, the existence of a water annulus was considered at the pipe wall, surrounding the flow core, where viscosity is equal to the water viscosity. The near-wall treatment was modified considering an expression for the logarithmic velocity profile in the boundary layer, similar to the one suggested by J?sberg (2007). The final model could reproduce the drag-reduction effect resulting from the presence of fibers in the flow. Moreover, the numerical results show that a better fit for pressure drop is obtained when the modified near-wall treatment is used and the J?sberg adjustable parameters a...
机译：使用商用CFD软件对管道中的湍流桉树纤维悬浮液进行了数值研究。提出了一种拟均质方法来预测纸浆纤维悬浮液在中等浓度和雷诺数为4.7÷65.3·103范围内的流动行为。将粘度作为剪切速率的函数引入模型中，以表示纸浆悬浮液的非牛顿行为。另外，考虑到在流动岩心周围的管壁处存在水环带，其中粘度等于水的粘度。考虑到边界层中对数速度分布的表达式，对近壁处理进行了修改，类似于J？sberg（2007）提出的表达式。最终模型可以重现流中纤维的存在所产生的减阻效果。此外，数值结果表明，使用改进的近壁处理方法和J？sberg可调参数可得到更好的压降拟合效果。

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