Natural convection heat transfer in a nanofluid filled semi-annulus enclosure

被引：233

作者：

Soleimani, Soheil ^{[1
]}

Sheikholeslami, M. ^{[1
]}

Ganji, D. D. ^{[1
]}

Gorji-Bandpay, M. ^{[1
]}

机构：

[1] Babol Univ Technol, Dept Mech Engn, Babol Sar, Iran

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2012年 / 39卷 / 04期

关键词：

Semi-annulus enclosure; Nanofluid; Natural convection; CVFEM; Vorticity stream function formulation; LAMINAR MIXED CONVECTION; ENTRANCE REGION; TRANSFER ENHANCEMENT;

D O I：

10.1016/j.icheatmasstransfer.2012.01.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

To investigate natural convection heat transfer in a semi-annulus enclosure filled with nanofluid, the Control Volume based Finite Element Method (CVFEM) is used. The fluid in the enclosure is Cu-water nanofluid. The inner and outer semi circular walls are maintained at constant temperatures while the two other walls are thermally insulated. The Navier Stokes equations in their vorticity-stream function form are used to simulate the flow pattern and isotherms. The numerical investigation is carried out for different governing parameters namely; the Rayleigh number, nanoparticle volume fraction and the angle of turn for the enclosure. The effective thermal conductivity and viscosity of nanofluid are calculated using the Maxwell-Garnetts (MG) and Brinkman models, respectively. The results reveal that there is an optimum angle of turn in which the average Nusselt number is maximum for each Rayleigh number. Moreover, the angle of turn has an important effect on the streamlines, isotherms and maximum or minimum values of local Nusselt number. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：565 / 574

页数：10

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