Experimental study on heat transfer enhancement of nanofluid flow through helical tubes

被引：44

作者：

Ardekani, A. Mokhtari ^{[1
]}

Kalantar, V. ^{[1
]}

Heyhat, M. M. ^{[2
]}

机构：

[1] Yazd Univ, Mech Engn Dept, Yazd, Iran

[2] Tarbiat Modares Univ, Fac Mech Engn, Tehran, Iran

来源：

ADVANCED POWDER TECHNOLOGY | 2019年 / 30卷 / 09期

关键词：

Nanofluid; Experimental heat transfer; Helically coiled tube; Nanoparticle; Empirical correlations; Turbulent flow; THERMAL-CONDUCTIVITY; TRANSFER COEFFICIENT;

D O I：

10.1016/j.apt.2019.05.026

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Fluid flow and heat transfer characteristics of nanofluids flowing through helically coiled tubes under uniform heat flux condition are studied experimentally. The turbulent flow of two different kinds of nanofluids, i.e. Ag-water and SiO2-water, are examined. Three different helically coiled tubes along with straight ones are constructed to investigate the effects of geometrical parameters such as pitch circle diameter and helical pitch as well as nanoparticle volume concentration. The viscosity and thermal conductivity of nanofluids are determined experimentally in different volume fractions and temperatures. The range of Reynolds number is from 8900 to 11970. The experimental outcomes show that using nanoparticles in coiled tubes can be more effective in improving the heat transfer rate than the straight tube. Empirical correlations are extracted based on experimental data to predict the Nusselt number and friction factor of turbulent nanofluids flow through helically coiled tubes. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

引用

收藏

页码：1815 / 1822

页数：8

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