NETmix is a network mixer comprising mixing chambers interconnected by channels. Recently, a reduced geometry CFD model, the LoopNUB, was introduced for simulating single-phase flow with heat transfer in NETmix by imposing periodic conditions around the four unit cells of the network. This work proposes using LoopNUB, reducing the simulation domain by 2.3 compared to the geometry (ExtendedNUB) previously used to simulate two-phase flow. A water-in-oil churn flow was modelled. The flow patterns and critical aspects related to two-phase mixing obtained with LoopNUB are similar to those obtained in downstream chambers of ExtendedNUB, proving the flow periodicity in NETmix and the ability of LoopNUB to reduce the simulation domain also for multiphase flows. The LoopNUB does not simulate entrance effects, observed in the first three rows of the network, but provides a better description of the fully developed flow regions, which account for more than 90% of an industrial reactor.

中文翻译：

---

使用周期性边界条件模拟网络混合器中的两相流


NETmix 是一种网络混合器，由通过通道互连的混合室组成。最近，引入了一种简化几何 CFD 模型 LoopNUB，用于通过在网络的四个晶胞周围施加周期性条件来模拟 NETmix 中具有传热作用的单相流。这项工作建议使用 LoopNUB，与以前用于模拟两相流的几何结构 （ExtendedNUB） 相比，仿真域减少了 2.3。对油包水搅动流进行了建模。使用 LoopNUB 获得的与两相混合相关的流型和关键方面与在 ExtendedNUB 下游腔室中获得的流型和关键方面相似，证明了 NETmix 中的流动周期性以及 LoopNUB 减少多相流仿真域的能力。LoopNUB 不模拟在网络的前三行中观察到的入口效应，但更好地描述了完全开发的流动区域，这些区域占工业反应器的 90% 以上。