化工进展 ›› 2021, Vol. 40 ›› Issue (S2): 30-39.DOI: 10.16085/j.issn.1000-6613.2021-0928

• 化工过程与装备 • 上一篇    下一篇

Lightnin静态混合器内纳米流体湍流传热特性分析

禹言芳1,2(), 陈雅鑫1,2, 孟辉波1,2(), 王宗勇1,2, 吴剑华1,2   

  1. 1.沈阳化工大学机械与动力工程学院,辽宁 沈阳 110142
    2.沈阳化工大学辽宁省高效化工混合技术重点实验室,辽宁 沈阳 110142
  • 收稿日期:2021-04-29 修回日期:2021-06-30 出版日期:2021-11-12 发布日期:2021-11-12
  • 通讯作者: 孟辉波
  • 作者简介:禹言芳(1979—),女,博士,副教授,研究方向为静态混合器流动特性及强化机理。E-mail:taroyy@163.com
  • 基金资助:
    辽宁特聘教授计划(辽教函[2018]35号);国家自然科学基金面上项目(21476142);沈阳市“中青年科技创新人才支持计划”(RC200032);辽宁省“百千万人才工程”项目(201892151);辽宁省教育厅项目(LQ2019003);辽宁省自然科学基金(2019-ZD-0082)

Analysis of turbulent heat transfer characteristics of nanofluids in the Lightnin static mixer

YU Yanfang1,2(), CHEN Yaxin1,2, MENG Huibo1,2(), WANG Zongyong1,2, WU Jianhua1,2   

  1. 1.College of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
    2.Liaoning Key Laboratory of Chemical Technology for Efficient Mixing, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
  • Received:2021-04-29 Revised:2021-06-30 Online:2021-11-12 Published:2021-11-12
  • Contact: MENG Huibo

摘要:

静态混合器作为一种高效传热传质连续流强化设备,在化工过程强化技术中具有明显技术特色。由于缺乏纳米流体的物性对Lightnin静态混合器(LSM)内传热特性影响的研究,一定程度上制约了LSM强化传热应用的进一步推广。本文采用混合多相流模型和SST k-ω湍流模型,在Re=8000~28000和恒热流密度条件下,从熵产以及速度场与温度场的协同性等方面分析纳米颗粒的体积分数、种类及粒径大小对LSM内传热特性的影响。结果表明,随着Cu纳米颗粒体积分数的增加,纳米流体的综合传热性能及温度场与速度场的协同性能逐渐增强,总熵产率和Be数逐渐减小,体积分数为0.5%~2.0%的Cu-H2O的纳米流体在Re=8000~28000范围内的综合传热性能系数(PEC)分别达到2.16~2.25、3.16~3.25、3.94~4.15及4.64~5.16。Cu-H2O、Al2O3-H2O及CuO-H2O这3种纳米流体相比,Cu-H2O纳米流体的强化传热性能要远好于其他两种纳米流体,Al2O3-H2O及CuO-H2O纳米流体的平均PEC分别是Cu-H2O纳米流体的0.47倍和0.46倍。随着Cu纳米颗粒粒径的增加,纳米流体的综合传热性能和温度场与速度场的协同性能逐渐减弱,总熵产率和Be数逐渐增加。

关键词: 静态混合器, 纳米流体, 总熵产, 协同数, 传热, 数值模拟

Abstract:

The static mixer is a kind of highly efficient and online heat and mass transfer enhanced equipment and has excellent characteristics in the chemical process intensification. The lack of research about the effects of physical properties of nanofluids on the heat transfer characteristics in the Lightnin static mixer (LSM) restricts a further industrial application of LSM in the field of enhancing heat transfer. The effects of volume fraction, particle type and size of nanoparticles on the heat transfer in LSM were numerically evaluated under the conditions of Re=8000—28000 and constant heat flux using the SST k-ω turbulence model and multiphase mixture model. With the increasing of volume fraction of Cu-H2O nanofluids, the comprehensive heat transfer performance (PEC) and synergy between velocity field and temperature field of nanofluids are gradually enhanced while the total entropy production rate and Be gradually decrease. The PEC values of Cu-H2O nanofluids with volume fractions from 0.5% to 2.0% could be obtained up to 2.16—2.25, 3.16—3.25, 3.94—4.15 and 4.64—5.16 at Re=8000—28000, respectively. The enhanced heat transfer performance of Cu-H2O nanofluids is much better than that in the Al2O3-H2O and CuO-H2O nanofluids. The average PEC of Al2O3-H2O and CuO-H2O are 0.47 and 0.46 times of Cu-H2O nanofluids, respectively. With the increasing particle size of Cu-H2O nanofluid, the comprehensive heat transfer performance and synergistic performance of the nanofluids are gradually weakened while the total entropy production rate and Be gradually increase.

Key words: static mixer, nanofluid, total entropy generation, field synergy number, heat transfer, numerical simulation

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