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Assessment of Gel Formation in Colloidal Dispersions during Mixing in Turbulent Jets

机译：湍流射流混合过程中胶体分散体中凝胶形成的评估

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摘要

Onset of gel formation upon mixing between colloidal dispersions and coagulant solutions in turbulent jets was studied using a combination of computational fluid dynamics (CFD) and population balance equation (PBE). To describe the interaction between turbulence fluctuations and particle aggregation, a micromixing model based on presumed probability density function was implemented inside the CFD code. Furthermore, effect of the solid phase on the fluid flow was modeled through an effective viscosity of the mixture evaluated from PBE. The results are presented in the parameter space of the primary particle diameter and the solid volume fraction where strong interplay between mixing and aggregation mechanisms controls the gelation phenomena and consequently also the fluid dynamics. Simulation results are in good agreement with observations from gelation experiments of concentrated nanoparticle suspensions injected into coagulant solutions.
机译：使用计算流体动力学（CFD）和种群平衡方程（PBE）的组合研究了在湍流射流中胶体分散体和凝结剂溶液之间混合后凝胶形成的开始。为了描述湍流波动与颗粒聚集之间的相互作用，在CFD代码内部实现了基于假定概率密度函数的微混合模型。此外，通过从PBE评估的混合物的有效粘度来模拟固相对流体流动的影响。结果显示在一次粒径和固体体积分数的参数空间中，其中混合和聚集机制之间的强烈相互作用控制了凝胶现象，因此也控制了流体动力学。模拟结果与注入凝结剂溶液的浓缩纳米颗粒悬浮液的凝胶化实验观察结果非常吻合。

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