Large eddy simulation of turbulent heat transfer at supercritical pressures
Large eddy simulation of turbulent heat transfer at supercritical pressures
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DOI：
10.1016/j.nucengdes.2013.03.042
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发表时间：
2013-08-01
影响因子：
1.7
通讯作者：
Sharabi, M.
中科院分区：
文献类型：
--
作者：
Niceno, B.;Sharabi, M.
本文给出了超临界压力下水的湍流传热大涡模拟结果。考虑了两种情况：外加热管道中的向下流动和向上流动。两种情况所涉及的温度范围都包含拟临界区，在该区域工作流体的物理性质发生显著变化。特别是向上流动的情况，具有传热恶化的特征，表现为壁温大幅升高。数值框架由基于笛卡尔网格的交错有限体积法组成，并通过投影法进行时间积分。工作流体的可变物理性质基于美国国家标准与技术研究院（NIST）数据库以查找表的形式实现。收集了55个大涡周转时间范围内的湍流统计数据。给出了一阶和二阶矩统计结果。特别是壁温与测量值吻合良好。作者认为，本文所呈现的对湍流统计的深入了解有助于改进基于雷诺平均纳维 - 斯托克斯方程的模型。© 2013爱思唯尔有限公司。保留所有权利。
The paper presents results of large eddy simulation of turbulent heat transfer for water at supercritical pressures. Two cases are considered; the downward and the upward flow in an externally heated pipe. The temperature range for both considered cases entails the pseudo-critical region, where physical properties of the working fluid change significantly. The upward case, in particular, features the heat transfer deterioration, characterized by large increase in wall temperature. The numerical framework consists of staggered finite volume method, defined on Cartesian grids, integrated in time with a projection method. Variable physical properties of the working fluid are implemented as look-up tables, based on the NIST database. Turbulent statistics were gathered for a range of 55 large-eddy turn-over times. The results for first and second moment statistics are presented. Wall temperature, in particular, compares favorably with measurements. The authors believe that insight into turbulent statistics presented in this work can be useful to improve Reynolds-averaged Navier-Stokes based models. (C) 2013 Elsevier B.V. All rights reserved.