Physical modeling of conjugate heat transfer for multiregion and multiphase systems with the Volume-of-Fluid method

IF 8.7 2区 工程技术 Q1 Mathematics
Johannes Kind, Axel Sielaff, Peter Stephan
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Abstract

The Volume-of-Fluid (VOF) method is commonly used for numerical simulations of phase change phenomena, such as nucleate boiling or droplet evaporation. A key issue with the standard VOF method is the averaging of the liquid and vapor properties in interface cells, which causes non-physical conjugate heat transfer with a solid wall. Therefore, we aim at a physical model for conjugate heat transfer between a solid and a multiphase fluid. The first measure for higher quality simulations is the splitting of the single temperature field in the fluid region into separate liquid and vapor temperature fields. The second measure is the development of a new, more physical temperature boundary condition for conjugate heat transfer between a solid region and a multiphase fluid, based on experimental results, theoretical models and theoretical considerations. In interface cells, the vapor phase is excluded from the conjugate heat transfer because only heat transfer to the liquid phase occurs resp. dominates. Additionally, the conjugate heat transfer between solid and liquid in the interface cells is performed with virtual subcells, depending on the respective volume fraction of the liquid phase. This new approach (we name it distinctive approach) is successfully validated for energy conservation, and stability issues are discussed for the first time. Significant differences to simulations with averaged properties are observed due to the (now) physically correct modeling of conjugate heat transfer. In our boiling cases, the more accurate numerical simulations lead to considerably larger bubble growth rates. Higher quality simulations are also expected for nearly all applications, where there is a three-phase contact line, be it vapor bubbles in nucleate boiling or droplets impacting on a heated surface.

Abstract Image

用流体体积法建立多区域和多相系统共轭传热的物理模型
流体体积(VOF)法通常用于核沸腾或液滴蒸发等相变现象的数值模拟。标准 VOF 方法的一个关键问题是界面单元中液体和蒸汽属性的平均化,这会导致与固体壁的非物理共轭传热。因此,我们的目标是建立固体与多相流体之间共轭传热的物理模型。提高模拟质量的第一项措施是将流体区域的单一温度场拆分为独立的液体和蒸汽温度场。第二项措施是在实验结果、理论模型和理论考虑的基础上,为固体区域和多相流体之间的共轭传热开发一种新的、更具物理性的温度边界条件。在界面单元中,气相被排除在共轭传热之外,因为只有对液相的传热才会发生。此外,界面电池中固体和液体之间的共轭传热是通过虚拟子电池进行的,这取决于液相各自的体积分数。这种新方法(我们将其命名为独特方法)成功地验证了能量守恒,并首次讨论了稳定性问题。由于(现在)对共轭传热进行了物理上正确的建模,因此可以观察到与平均特性模拟的显著差异。在我们的沸腾案例中,更精确的数值模拟导致了更大的气泡增长率。在几乎所有存在三相接触线的应用中,无论是成核沸腾中的蒸汽气泡还是撞击加热表面的液滴,都有望获得更高质量的模拟结果。
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来源期刊
Engineering with Computers
Engineering with Computers 工程技术-工程:机械
CiteScore
16.50
自引率
2.30%
发文量
203
审稿时长
9 months
期刊介绍: Engineering with Computers is an international journal dedicated to simulation-based engineering. It features original papers and comprehensive reviews on technologies supporting simulation-based engineering, along with demonstrations of operational simulation-based engineering systems. The journal covers various technical areas such as adaptive simulation techniques, engineering databases, CAD geometry integration, mesh generation, parallel simulation methods, simulation frameworks, user interface technologies, and visualization techniques. It also encompasses a wide range of application areas where engineering technologies are applied, spanning from automotive industry applications to medical device design.
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