Turbulent flow characteristics of nanofluids inside circular tube

被引：0

作者：

Wang, Peng ^{[1
]}

Bai, Minli ^{[1
]}

Lü, Jizu ^{[1
]}

Hu, Chengzhi ^{[1
]}

Wang, Yuyan ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning

来源：

Huagong Xuebao/CIESC Journal | 2014年 / 65卷 / SUPPL.1期

关键词：

CFD; Nanofluids; Pressure drop; Turbulent flow; Two-phase flow;

D O I：

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

中图分类号：

学科分类号：

摘要：

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. © All Rights Reserved.

引用

页码：17 / 26

页数：9

共 19 条

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