A numerical investigation of transient natural convection heat transfer of aqueous nanofluids in a horizontal concentric annulus

被引：50
|
作者：
Yu, Zi-Tao [1 ]
Xu, Xu [2 ]
Hu, Ya-Cai [1 ]
Fan, Li-Wu [3 ]
Cen, Ke-Fa [4 ]
机构：
[1] Zhejiang Univ, Inst Thermal Sci & Power Syst, Dept Energy Engn, Hangzhou 310027, 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 JOURNAL OF HEAT AND MASS TRANSFER | 2012年 / 55卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Numerical simulation; Transient natural convection; Heat transfer; Horizontal concentric annulus; Nanofluids; Brownian motion; THERMAL-CONDUCTIVITY; TRANSFER ENHANCEMENT; BROWNIAN-MOTION; ENCLOSURE; SUSPENSIONS; DIAMETER; MODEL; FLOW;
D O I：
10.1016/j.ijheatmasstransfer.2011.09.058
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A numerical study of transient natural convection heat transfer of aqueous nanofluids in a horizontal annulus between two coaxial cylinders is presented. The effective thermophysical properties of water in the presence of copper oxide nanoparticles with four different volume fractions are predicted using existing models, in which the effects of the Brownian motion of nanoparticles are taken into consideration. The predicted development of convective flow and heat transfer of nanofluids is presented by means of the average Nusselt number over the outer cylinder. The flow development time towards a steady state and the time-averaged Nusselt number are predicted and scaled with Rayleigh number. It is shown that at constant Rayleigh numbers, the time-averaged Nusselt number is gradually lowered as the volume fraction of nanoparticles is increased. In addition, the time-averaged Nusselt number will be overestimated if the Brownian motion effects are not considered. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1141 / 1148
页数：8
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