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A Multiscale Approach Simulating Generic Pool Boiling
Nuclear Science and Engineering ( IF 1.2 ) Pub Date : 2020-05-29 , DOI: 10.1080/00295639.2020.1764265
T. Höhne 1 , D. Lucas 1
Affiliation  

Abstract This technical paper presents an application of the GEneralized TwO Phase flow (GENTOP) model for phase transfer and discusses the submodels used. Boiling of a heated surface under atmospheric conditions is simulated by the multifield computational fluid dynamics (CFD) approach. Subcooled water in a generic pool is heated up first in the near-wall region leading to the generation of small bubbles. Farther away from the bottom wall, larger bubbles are generated by coalescence and evaporation. The CFD simulation is based on the recently developed GENTOP concept. It is a multifield model using the Euler-Euler approach, and it allows the consideration of different local-flow morphologies, including transitions between them. Small steam bubbles are handled as dispersed phases, while the interface of large gas structures is statistically resolved. The multiscale simulation of the transitions from small bubble to larger structures during boiling in a pool is now feasible. However, the GENTOP submodels need a constant improvement and a separate, intensive validation effort using CFD-grade experiments.

中文翻译:

一种模拟通用池沸腾的多尺度方法

摘要 本技术论文介绍了通用双相流 (GENTOP) 模型在相转移中的应用,并讨论了所使用的子模型。通过多场计算流体动力学 (CFD) 方法模拟大气条件下加热表面的沸腾。普通水池中的过冷水首先在近壁区域加热,从而产生小气泡。离底壁越远,聚结和蒸发就会产生更大的气泡。CFD 模拟基于最近开发的 GENTOP 概念。它是一个使用 Euler-Euler 方法的多场模型,它允许考虑不同的局部流动形态,包括它们之间的过渡。小蒸汽泡作为分散相处理,而大型气体结构的界面是统计解析的。在池中沸腾期间从小气泡到更大结构的转变的多尺度模拟现在是可行的。然而,GENTOP 子模型需要使用 CFD 级实验不断改进和单独的、密集的验证工作。
更新日期:2020-05-29
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