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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >High-Rayleigh heat transfer flow: Thermal stratification analysis and assessment of Boussinesq approach
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High-Rayleigh heat transfer flow: Thermal stratification analysis and assessment of Boussinesq approach

机译：高瑞利换热流：Boussinesq方法的热分层分析和评估

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Purpose - The purpose of this paper is to assess the Boussinesq approach for a wide range of Ra (10 × 6 to 10 × 11) in two-dimensional (square cavity) and three-dimensional (cubic cavity) problems for air- and liquidfilled domains. Design/methodology/approach - The thermal behavior in "differentially heated cavities" filled with air (low and medium Rayleigh) and water (high Rayleigh) is solved using computational fluid dynamics (CFDs) (OpenFOAM) with a non-compressible (Boussinesq) and compressible approach (real water properties from the IAPWS database). Findings - The results from the wide range of Rayleigh numbers allowed for the establishment of the limitation of the Boussinesq approach in problems where the fluid has significant density changes within the operation temperature range and especially when the dependence of density with temperature is not linear. For these cases, the symmetry behavior predicted by Boussinesq is far from the compressible results, thus inducing a transient heat imbalance and leading to a higher mean temperature. Research limitations/implications - The main limitation of the present research can be found in the shortage of experimental data for very high Rayleigh problems. Practical implications - Practical implications of the current research could be use of the Boussinesq approach by carefully observing its limitations, especially for sensible problems such as the study of pressure vessels, nuclear reactors, etc. Originality/value - The originality of this paper lies in addressing the limitations of the Boussinesq approach for high Rayleigh water systems. This fluid is commonly used in numerous industrial equipment. This work presents valuable conclusions about the limitations of the currently used models to carry out industrial simulations.
机译：目的-本文的目的是评估在空气和液体填充的二维（方腔）和三维（立方腔）问题中，对于宽范围的Ra（10×6至10×11）的Boussinesq方法域。设计/方法/方法-使用带有不可压缩（Boussinesq）的计算流体力学（CFD）（OpenFOAM）解决充满空气（中瑞利和中瑞利）和水（瑞利高）的“差热腔”中的热行为和可压缩的方法（来自IAPWS数据库的真实水属性）。发现-广泛的瑞利数结果可建立Boussinesq方法的局限性，以解决流体在工作温度范围内密度发生显着变化的问题，尤其是密度与温度的关系不是线性的情况下。对于这些情况，Boussinesq预测的对称行为远非可压缩结果，从而导致瞬态热失衡并导致更高的平均温度。研究局限性/含义-当前研究的主要局限性在于非常高的瑞利问题缺乏实验数据。实际意义-当前研究的实际意义可能是通过仔细观察Boussinesq方法的局限性，特别是对于诸如压力容器，核反应堆等敏感问题的使用。Boussinesq方法的独创性/价值-本文的独创性在于解决Boussinesq方法在高瑞利水系统中的局限性。这种流体通常用于许多工业设备中。这项工作提出了有关当前用于进行工业仿真的模型的局限性的有价值的结论。

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