Lightnin静态混合器内纳米流体湍流传热特性分析

doi:10.16085/j.issn.1000-6613.2021-0928

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

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.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.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/Abstract

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

中图分类号:

TQ051.7

禹言芳, 陈雅鑫, 孟辉波, 王宗勇, 吴剑华. Lightnin静态混合器内纳米流体湍流传热特性分析[J]. 化工进展, 2021, 40(S2): 30-39.

YU Yanfang, CHEN Yaxin, MENG Huibo, WANG Zongyong, WU Jianhua. Analysis of turbulent heat transfer characteristics of nanofluids in the Lightnin static mixer[J]. Chemical Industry and Engineering Progress, 2021, 40(S2): 30-39.

图/表 12

图1 物理模型结构图

图2 LSM网格结构

表1 纳米颗粒和水的物性参数

物质	颗粒粒径d_p/nm	颗粒形状	密度ρ/kg·m^-3	比热容c_p/J·kg·K^-1	黏度μ/Pa·s	材料热导率λ_m/W·m^-1·K^-1
水	—	—	998.2	4182	0.001003	0.6
Cu	50、75、100	球形	8978	381	—	387.6
CuO	100	球形	6510	540	—	18
Al₂O₃	100	球形	3880	773	—	36

图3 网格无关性图

图4 单相流模型与混合模型与实验的对比图

图5 不同体积分数下Cu-H2O纳米流体的Nu、f及PEC随Re变化关系

图6 不同纳米流体Nu、f及PEC随Re变化关系

图7 不同粒径的Cu-H2O纳米流体的Nu、f及PEC数随Re变化关系

图8 不同体积分数下Cu-H2O纳米流体的总熵产率和Be数随Re变化关系

图9 不同种类纳米流体的总熵产率和Be数随Re变化关系

图10 不同粒径的Cu-H2O纳米流体的总熵产率随Re变化关系

图11 不同条件下纳米流体的协同数随Re变化关系

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Lightnin静态混合器内纳米流体湍流传热特性分析

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

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