Abstract
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 the evolution of particles undergoing coagulation and breakage. The Aggregation-Breakage Balance Equation is converted to a set of moment equations which contains the n/2th (n=0∼4) moments through the DEMM method. The newly proposed DEMM model is confirmed to be valid to describe the evolution of particle size distribution (PSD). The coherent structures dominate the evolution of particle concentration, geometric mean diameter and geometric standard deviation. The particle number concentration decreases and the span of particle diameter gets wider along the centerline as the jet develops. The geometric standard deviation is larger in the shear layer than that in the jet core.
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