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Simulation of Particle Coagulation and Breakage in a Planar Jet via the DEMM method

机译:通过DEMM方法模拟平面喷射中的颗粒凝固和破损

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Simultaneous numerical simulation of particle coagulation and breakage in a planar jet is performed. Large eddy simulation (LES)is adopted to calculate the flow field and the direct expansion method of moments (DEMM) is employed to describe theevolution of particles undergoing coagulation and breakage. The Aggregation-Breakage Balance Equation is converted to a set ofmoment equations which contains the n/2th (n=0~4) moments through the DEMM method. The newly proposed DEMM modelis confirmed to be valid to describe the evolution of particle size distribution (PSD). The coherent structures dominate theevolution of particle concentration, geometric mean diameter and geometric standard deviation. The particle numberconcentration decreases and the span of particle diameter gets wider along the centerline as the jet develops. The geometricstandard deviation is larger in the shear layer than that in the jet core.
机译:进行平面射流颗粒凝结和破损的同时数值模拟。 采用大涡模拟(LES)来计算流场,采用直接膨胀方法(DEMM)来描述经历凝血和破裂的颗粒的分析。 聚合 - 破坏平衡方程式被转换为通过DEMM方法包含N /第2(n = 0〜4)矩的一组MOMENT等式。 新建议的DEMM模型确认有效地描述粒度分布(PSD)的演变。 相干结构主导颗粒浓度,几何平均直径和几何标准偏差的角落。 当喷射发育时,粒子数互换减小,粒径沿中心线宽度宽。 剪切层的几何标准偏差比射流芯中的剪切层更大。

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