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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Simulation of turbulent flows in an impingement dryer by an extended k-ε model
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Simulation of turbulent flows in an impingement dryer by an extended k-ε model

机译：用扩展的k-ε模型模拟冲击干燥器中的湍流

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摘要

Results of numerical simulation of 2D and 3D flow field in a single slot jet discharging tangentially into a confined cylinder are presented. This geometry is relevant to new impingement dryers. An extended K--e turbulence model with a near-wall function treatment is used to simulate turbulent jet flows. A finite element weighted residual method is used to solve the governing mass, momentum, turbulent kinetic energy and turbulent kinetic energy dissipation equations. The computations were performed for the Reynolds number ranging from 3200 to 31 900. Slot width is varied from 0.5 to 1.0 cm. To verify the algorithm, numerical tests were Performed to ensure that the solutions were "grid independent". The mesh was constructed with four-node quadrilateral elements. Flow fields, velocity profiles, jet trajectories, recirculating flows and geometry effects were investigated. Recirculating flows were found for Reynolds lower than 6300. Desired velocity profiles were found for Reynolds upper than l5 000 with slot width of 1.0 cm.
机译：提出了在切向排放到封闭圆柱体中的单缝射流中2D和3D流场的数值模拟结果。这种几何形状与新型冲击式干燥机有关。具有近壁函数处理的扩展的K-e湍流模型用于模拟湍流射流。使用有限元加权残差法求解控制质量，动量，湍动能和湍动能耗散方程。对雷诺数在3200到31 900之间进行计算。缝隙宽度在0.5到1.0 cm之间变化。为了验证该算法，进行了数值测试以确保解决方案“与网格无关”。网格由四节点四边形元素构成。研究了流场，速度分布，射流轨迹，​​再循环流和几何效应。对于低于6300的雷诺，发现了再循环流动。对于高于1500的雷诺，在缝隙宽度为1.0厘米时，发现了所需的速度分布。

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