纳米流体圆管内的湍流流动特性

doi:10.3969/j.issn.0438-1157.2014.z1.004

化工学报 ›› 2014, Vol. 65 ›› Issue (S1): 17-26.DOI: 10.3969/j.issn.0438-1157.2014.z1.004

纳米流体圆管内的湍流流动特性

王鹏, 白敏丽, 吕继组, 胡成志, 王玉艳

大连理工大学能源与动力学院, 辽宁大连 116024

收稿日期:2013-01-14 修回日期:2013-01-20 出版日期:2014-05-30 发布日期:2014-05-30
通讯作者: 吕继组
基金资助:
国家自然科学基金项目（51006015，51276031，51376002）。

Turbulent flow characteristics of nanofluids inside circular tube

WANG Peng, BAI Minli, LÜ Jizu, HU Chengzhi, WANG Yuyan

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received:2013-01-14 Revised:2013-01-20 Online:2014-05-30 Published:2014-05-30
Supported by:
supported by the National Natural Science Foundation of China (51006015, 51276031, 51376002).

摘要/Abstract

摘要： 采用Eulerian-Eulerian模型和Eulerian-Lagrange模型研究了TiO₂-水纳米流体在水平管内的湍流流动特性，并与实验结果进行对比分析，探讨了不同模型中各种相间作用力的影响。从微流动角度探索纳米流体的流动本质，从而进一步揭示其传热强化机理。结果表明：在壁面附近，纳米颗粒与水存在着明显的速度差异，相间的动量交换十分明显，从而强化了局部微流动，导致边界层变薄。纳米颗粒在整个流场内部是不均匀分布的，使得边界层内部换热能力得到大幅度增强。纳米流体流动特性的改变是影响其强化换热的主要因素。

关键词: 纳米流体, 压差, 两相流, 湍流, 计算流体力学

Abstract: The current study explained the mechanism of heat transfer enhancement of nanofluids from the micro-flow aspect. The Eulerian-Eulerian and Euler-Lagrange multiphase models are implemented respectively to explore the flow field of nanofluids inside a horizontal circular tube under turbulent state.The pressure loss is used to validate the accuracy of predictions for each model, which is the most important flow parameter in turbulent flow but also is frequently ignored in previous numerical work.The results indicated that there is obvious velocity slip phenomenon between water and nanoparticles.Compared with the pure water, the development of nanofluids boundary layer is inevitably disturbed, which consequently decreases its thickness and thermal resistance.The distribution of nanoparticles in the entire flow field is not uniform, which improves overall heat transfer capacity inside the boundary layer. The present authors suggest the enhanced heat transfer capability of nanofluids is the result of altered flow characteristics when nanoparticles are present and the flow conditions are most important drivers of heat transfer enhancement in nanofluids. The thorough understanding on flow characteristics of nanofluids is essential for nanofluids flow, which is the basis of further utilization of nanofluids in engineering applications.

Key words: nanofluids, pressure drop, two-phase flow, turbulent flow, CFD

中图分类号:

TK402

王鹏, 白敏丽, 吕继组, 胡成志, 王玉艳. 纳米流体圆管内的湍流流动特性[J]. 化工学报, 2014, 65(S1): 17-26.

WANG Peng, BAI Minli, LÜ Jizu, HU Chengzhi, WANG Yuyan. Turbulent flow characteristics of nanofluids inside circular tube[J]. CIESC Journal, 2014, 65(S1): 17-26.

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纳米流体圆管内的湍流流动特性

Turbulent flow characteristics of nanofluids inside circular tube

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