Laminar convective heat transfer of non-Newtonian nanofluids with constant wall temperature

被引：36

作者：

Hojjat, M. ^{[1
]}

Etemad, S. Gh. ^{[1
]}

Bagheri, R. ^{[1
]}

Thibault, J. ^{[2
]}

机构：

[1] Isfahan Univ Technol, Dept Chem Engn, Esfahan 8415683111, Iran

[2] Univ Ottawa, Dept Chem & Biol Engn, Ottawa, ON K1N 6N5, Canada

来源：

HEAT AND MASS TRANSFER | 2011年 / 47卷 / 02期

关键词：

AQUEOUS SUSPENSIONS; TRANSFER ENHANCEMENT; OXIDE NANOFLUIDS; FLOW BEHAVIOR; NANOPARTICLES; WATER;

D O I：

10.1007/s00231-010-0710-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nanofluids are obtained by dispersing homogeneously nanoparticles into a base fluid. Nanofluids often exhibit higher heat transfer rate in comparison with the base fluid. In the present study, forced convection heat transfer under laminar flow conditions was investigated experimentally for three types of non-Newtonian nanofluids in a circular tube with constant wall temperature. CMC solution was used as the base fluid and gamma-Al2O3, TiO2 and CuO nanoparticles were homogeneously dispersed to create nanodispersions of different concentrations. Nanofluids as well as the base fluid show shear thinning (pseudoplastic) rheological behavior. Results show that the presence of nanoparticles increases the convective heat transfer of the nanodispersions in comparison with the base fluid. The convective heat transfer enhancement is more significant when both the Peclet number and the nanoparticle concentration are increased. The increase in convective heat transfer is higher than the increase caused by the augmentation of the effective thermal conductivity.

引用

页码：203 / 209

页数：7

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