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高温环境下团聚体颗粒的烧结现象决定了颗粒表面积、内部非均匀结构等。现有数值模拟方法中一般认为团聚体由若干尺度相同的一次粒子组成,不符合实验测量结果。该文考虑团聚体内一次粒子的多分散性,建立一次粒子质量平衡和数目平衡关系,描述烧结过程团聚体内一次粒子尺度分布函数的演变。对气相法制备TiO2纳米颗粒的烧结定制过程进行数值模拟,模拟结果与实验结果吻合较好,且考虑团聚体内一次粒子多分散分布的模型结果比考虑团聚体内一次粒子单分散分布的模型结果更精确。所建立的描述团聚体烧结过程的多分散模型可适用于多尺度模拟、颗粒群平衡模拟–Monte Carlo方法、多相流模拟的欧拉–拉氏模型等。
Agglomeration of particles under high temperature sintering phenomenon determines the particle surface area, the internal non-uniform structure. In the existing numerical simulation method, it is generally considered that the agglomerate consists of several primary particles with the same scale and does not meet the experimental measurement results. In this paper, we consider the polydispersity of primary particles in agglomerates and establish a primary particle mass balance and number equilibrium relationship, and describe the evolution of primary particle size distribution function in agglomerates during sintering. The results show that the simulation results are in good agreement with the experimental results. The model results that consider the polydisperse distribution of primary particles in the aggregates are more accurate than the model results which consider the monodispersed primary particles in the aggregates . The established polydisperse model describing agglomeration sintering process can be applied to multi-scale simulation, particle swarm equilibrium simulation-Monte Carlo method, Euler-Laplace model for multiphase flow simulation and so on.