Turbulent heat transfer and secondary flows in a non-uniformly heated pipe with temperature-dependent fluid properties

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Heat and Fluid Flow Pub Date : 2025-09-01 Epub Date: 2025-04-05 DOI:10.1016/j.ijheatfluidflow.2025.109791

A. Antoranz , O. Flores , M. García-Villalba

{"title":"Turbulent heat transfer and secondary flows in a non-uniformly heated pipe with temperature-dependent fluid properties","authors":"A. Antoranz , O. Flores , M. García-Villalba","doi":"10.1016/j.ijheatfluidflow.2025.109791","DOIUrl":null,"url":null,"abstract":"<div><div>The influence of temperature-dependent fluid properties in a turbulent pipe flow with sinusoidal heat flux boundary conditions is studied. Four cases with increasing sensitivity to temperature variations, representative of molten salts in solar heat receivers, are calculated by means of direct numerical simulation. The computations have been performed with a reference friction Reynolds number equal to 180 and a reference Prandtl number equal to 0.7. It is found that the fluid properties variations result in an enhancement (damping) of the flow and temperature fluctuations on the cold (hot) side of the pipe. Small secondary motions of Prandtl second kind are found to occur with a significant impact on the vertical heat flux, accounting for one third of the total heat flux in the most sensitive case. Finally, the effect of the variable fluid properties in integral quantities like friction coefficient and Nusselt number is quantified.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"115 ","pages":"Article 109791"},"PeriodicalIF":2.6000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Fluid Flow","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0142727X25000499","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/5 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The influence of temperature-dependent fluid properties in a turbulent pipe flow with sinusoidal heat flux boundary conditions is studied. Four cases with increasing sensitivity to temperature variations, representative of molten salts in solar heat receivers, are calculated by means of direct numerical simulation. The computations have been performed with a reference friction Reynolds number equal to 180 and a reference Prandtl number equal to 0.7. It is found that the fluid properties variations result in an enhancement (damping) of the flow and temperature fluctuations on the cold (hot) side of the pipe. Small secondary motions of Prandtl second kind are found to occur with a significant impact on the vertical heat flux, accounting for one third of the total heat flux in the most sensitive case. Finally, the effect of the variable fluid properties in integral quantities like friction coefficient and Nusselt number is quantified.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

具有温度依赖流体性质的非均匀加热管道中的湍流传热和二次流

研究了具有正弦热流边界条件的管内湍流中随温度变化的流体性质的影响。用直接数值模拟的方法计算了四种对温度变化越来越敏感的情况，其中有代表性的是太阳能热接收器中的熔盐。在参考摩擦雷诺数为180，参考普朗特数为0.7的条件下进行了计算。研究发现，流体性质的变化导致管道冷（热）侧流动和温度波动的增强（阻尼）。在最敏感的情况下，微小的普朗特第二类二次运动对垂直热流的影响很大，占总热流的三分之一。最后，量化了摩擦系数和努塞尔数等积分变量对流体性质的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.