A numerical investigation of transient natural convection heat transfer of aqueous nanofluids in a differentially heated square cavity

被引：29

作者：

Yu, Zi-Tao ^{[1
]}

Wang, Wei ^{[1
]}

Xu, Xu ^{[2
]}

Fan, Li-Wu ^{[3
]}

Hu, Ya-Cai ^{[1
]}

Cen, Ke-Fa ^{[4
]}

机构：

[1] Zhejiang Univ, Inst Thermal Sci & Power Syst, Dept Energy Engn, Hangzhou 370027, Zhejiang, Peoples R China

[2] China Jiliang Univ, Coll Metrol & Measurement Engn, Hangzhou 310018, Zhejiang, Peoples R China

[3] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA

[4] Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2011年 / 38卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Numerical simulation; Transient natural convection; Heat transfer; Differentially heated square cavity; Nanofluids; Brownian motion; TRANSFER ENHANCEMENT; ENCLOSURE; FEATURES;

D O I：

10.1016/j.icheatmasstransfer.2011.03.017

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Transient natural convection heat transfer of aqueous nanofluids in a differentially heated square cavity is investigated numerically. The effective thermal conductivity and dynamic viscosity of nanofluids are predicted by using the proposed models that take the contribution of Brownian motion of nanoparticles into account. Three different Rayleigh numbers and five different volume fractions of nanoparticles are considered. The development of natural convection is presented through the evolutions of the average Nusselt number along the cold side wall. The predicted flow development times and time-averaged Nusselt numbers are scaled with Rayleigh number. In addition, the time-averaged Nusselt numbers are presented in terms of volume fraction of nanoparticles. It is shown that at constant Rayleigh numbers, the time-averaged Nusselt number is lowered with increasing volume fraction of nanoparticles. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：585 / 589

页数：5

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