Irreversibility analysis of a vertical annulus using TiO2/water nanofluid with MHD flow effects

被引：81
|
作者：
Mahian, Omid [1 ]
Pop, Ioan [2 ]
Sahin, Ahmet Z. [3 ]
Oztop, Hakan F. [4 ]
Wongwises, Somchai [5 ]
机构：
[1] Islamic Azad Univ, Mashhad Branch, Young Researchers Club & Elites, Mashhad, Iran
[2] Univ Babes Bolyai, Dept Math, Cluj Napoca 400084, Romania
[3] King Fahd Univ Petr & Minerals, Dept Mech Engn, Dhahran 31261, Saudi Arabia
[4] Firat Univ, Fac Technol, Dept Mech Engn, TR-23169 Elazig, Turkey
[5] King Mongkuts Univ Technol Thonburi, Fac Engn, Dept Mech Engn, Fluid Mech Thermal Engn & Multiphase Flow Res Lab, Bangkok 10140, Thailand
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2013年 / 64卷
关键词：
Nanofluid; Entropy generation; Vertical annulus; MHD flow; Analytical solution; HEAT-TRANSFER PERFORMANCE; ENTROPY GENERATION; ROTATING CYLINDERS; CONVECTION; ENCLOSURE;
D O I：
10.1016/j.ijheatmasstransfer.2013.05.001
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this paper, an analytical study of the second law of thermodynamics is performed for the flow and heat transfer of TiO2/water nanofluid in a vertical annulus with isoflux walls and under the influence of magnetohydrodynamic (MHD) field. The governing equations in cylindrical coordinates are written and then simplified with reasonable assumptions. The simplified equations are solved analytically to obtain expressions for the velocity, temperature, and entropy generation distributions. The results are presented for different values of nanofluid volume fractions phi(0% <= phi <= 2%), Hartmann number M and the flow parameter Gr/Re. To calculate the thermal conductivity and viscosity of TiO2/water nanofluid, relations based on experimental data are used. Finally, using the well-known theoretical models for the thermal conductivity and viscosity, the effects of Hartmann number on the results are investigated. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：671 / 679
页数：9
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