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A Numerical Study of Turbulent Mixed Convection in a Smooth Horizontal Pipe

机译:光滑水平管内湍流混合对流的数值研究

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摘要

This paper presents a numerical study aimed at identifying a suitable turbulence model to describe the fully developed turbulent mixed convention of air in smooth horizontal pipes. The flow characteristics considered here are relevant to those typically observed in ventilated hollow core slab (VHCS) applications and, because of this, the adopted geometry and boundary conditions are represented by the Reynolds number and Richardson number of about 23,000 and 1.04, respectively. Empirical expressions available in the literature are used as reference to evaluate the accuracy of different turbulence models in predicting the dimensionless velocity (u~+) and temperature (T~+) profiles as well as the Nusselt number (Nu). Among the turbulence models considered, the standard and realizable k-ε models provide the best overall predictions of u~+, T~+, and Nu in the fully developed flow, and the former is recommended for the modeling of VHCS systems as it gives slightly better estimates of the Nu values.
机译:本文提出了一个数值研究,旨在确定合适的湍流模型来描述光滑水平管中空气的充分发展的湍流混合规律。这里考虑的流动特性与通风空心板(VHCS)应用中通常观察到的流动特性有关,因此,采用的几何形状和边界条件分别由约23,000和1.04的雷诺数和理查森数表示。文献中可用的经验表达式可作为参考,以评估不同湍流模型在预测无量纲速度(u〜+)和温度(T〜+)以及努塞尔特数(Nu)时的准确性。在考虑的湍流模型中,标准和可实现的k-ε模型在充分发展的流动中提供了u〜+,T〜+和Nu的最佳总体预测,建议将前者用于VHCS系统的建模Nu值的估计要好一些。

著录项

  • 来源
    《Journal of Heat Transfer》 |2016年第1期|012501.1-012501.11|共11页
  • 作者单位

    School of Civil Engineering, The University of Sydney, Building J05, New South Wales 2006, Australia;

    School of Civil Engineering, The University of Sydney, Building J05, New South Wales 2006, Australia;

    Faculty of Architecture, Design & Planning, The University of Sydney, Building G04, New South Wales 2006, Australia;

    School of Civil Engineering, The University of Sydney, Building J05, New South Wales 2006, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pipe flow; mixed convection; turbulence models; buoyancy; Nusselt number; heat transfer;

    机译:管道流量混合对流湍流模型浮力;努塞尔数传播热量;

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