Direct Numerical Simulation of Turbulent Flow and Heat Transfer in Square Duct with Steady Natural Convection in Cross Section

马良栋; 李增耀; 陶文铨

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Direct Numerical Simulation of Turbulent Flow and Heat Transfer in Square Duct with Steady Natural Convection in Cross Section

更新时间：2025-12-08

- Direct Numerical Simulation of Turbulent Flow and Heat Transfer in Square Duct with Steady Natural Convection in Cross Section
- Vol. 41, Issue 3, Pages: 367-371(2007)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： O357.5
- Online First：10 March 2007，
  
  Published：2007
- 稿件说明：
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马良栋, 李增耀, 陶文铨. Direct Numerical Simulation of Turbulent Flow and Heat Transfer in Square Duct with Steady Natural Convection in Cross Section[J]. 2007, 41(3): 367-371.
DOI：

马良栋, 李增耀, 陶文铨. Direct Numerical Simulation of Turbulent Flow and Heat Transfer in Square Duct with Steady Natural Convection in Cross Section[J]. 2007, 41(3): 367-371. DOI：

摘要

对矩形管道内具有稳定自然对流的充分发展湍流换热进行了直接数值模拟

湍流雷诺数Re

和普朗特数Pr分别为400和0.71

格拉晓夫数Gr为10

、10

和10

.分析了管道截面上雷诺应力对主流平均速度、截面流速以及截面平均温度的影响.结果表明:在Gr较小时

湍流雷诺应力的作用使截面的平均换热系数增大; 在Gr为10

时

浮升力的作用增强

但湍流产生的雷诺应力使自然对流的作用减弱.因此

与层流相比

在Gr相同时

湍流的管道截面平均换热系数反而减小.

Abstract

A direct numerical simulation of a fully developed turbulent flow and heat transfer was conducted in a square duct with a steady natural convection. The flow field was simulated at a turbulent Reynolds number of 400 based on the mean friction velocity and the hydraulic diameter

and a Prandtl number of 0.71. Four different Grashof numbers(Gr is 10

and 10

respectively)were considered. The influence of Reynolds stress on the streamwise velocity

crosswise velocity and mean temperature was investigated. The results show that the Reynolds stress has more effect than buoyancy body force at the lower Gr number

leading to an increase of the mean heat transfer. However

for the higher Grashof nu

mber cases(Gr is 10

)

the buoyancy body force becomes dominant

the natural convection is somewhat weakened by the Reynolds stress

and the mean heat transfer coefficient is even less than that at the same Gr number in laminar case.

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references

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马良栋, 李增耀, 陶文铨.高精度有限差分在壁面湍流直接数值模拟中的应用 [C]∥中国工程热物理学会传热传质学术会议论文集:中册.南京:中国工程热物理学会,2006:1167-1170.

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Related Institution

国家核电技术有限公司北京研发中心

School of Energy and Power Engineering, Xi’an Jiaotong University

College of Environmental Science and Engineering, Chang'an University

School of Civil and Hydraulic Engineering, Dalian University of Technology

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