Numerical study of nanofluid mixed convection in a horizontal curved tube using two-phase approach

被引：25

作者：

Alikhani, S. ^{[1
]}

Behzadmehr, A. ^{[1
]}

Saffar-Avval, M. ^{[2
]}

机构：

[1] Univ Sistan & Baluchestan, Dept Mech Engn, Zahedan, Iran

[2] Amirkabir Univ Technol, Dept Mech Engn, Tehran, Iran

来源：

HEAT AND MASS TRANSFER | 2011年 / 47卷 / 01期

关键词：

HEAT-TRANSFER ENHANCEMENT; EFFECTIVE THERMAL-CONDUCTIVITY; FLOW; FLUIDS; MODEL;

D O I：

10.1007/s00231-010-0677-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Laminar mixed convection of nanofluid consisting of water/Al2O3 in a horizontal curved tube is investigated numerically. Three dimensional elliptical governing equations have been solved to study the simultaneous effect of the buoyancy and centrifugal forces throughout the curved tube. The effects of nanoparticle concentrations on the secondary flow and also on the contours of temperature are presented and discussed. Axial velocity profiles with respect to the horizontal and vertical diameter are shown. In addition, the effects of nanoparticle volume fractions on the axial evolution of the local peripheral average convective heat transfer coefficient and the local peripheral average skin friction coefficient are studied. It is shown that the average convective heat transfer coefficient augments with the nanoparticle concentrations. However, its effect on the average skin friction coefficient is negligible.

引用

页码：107 / 118

页数：12

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