Buoyancy induced heat transfer deterioration in vertical concentric and eccentric annuli

被引：13

作者：

Forooghi, Pourya ^{[1
]}

Abdi, Iman Ashtiani ^{[1
]}

Dahari, Mahidzal ^{[2
]}

Hooman, Kamel ^{[1
]}

机构：

[1] Univ Queensland, Sch Mech & Min Engn, Queensland Geothermal Energy Ctr Excellence, Brisbane, Qld 4072, Australia

[2] Univ Malaya, Fac Engn, Dept Mech Engn, Kuala Lumpur 50603, Malaysia

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2015年 / 81卷

关键词：

Heat transfer deterioration; Turbulent mixed convection; Eccentric annuli; TURBULENCE MODELS; MIXED CONVECTION; FLOWS; TUBE;

D O I：

10.1016/j.ijheatmasstransfer.2014.10.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Turbulent convection heat transfer of upward fluid flows in vertical annular channels with uniformly heated inner wall and adiabatic outer wall is investigated numerically. Two concentric geometries with outer-to-inner diameter ratios of 2.4 and 3 as well as two eccentric geometries with identical outer-toinner diameter ratio of 2.4 and eccentricities of 0.25 and 0.5 are investigated. Heat transfer deterioration, similar to that of a circular pipe, is observed. The range of buoyancy parameter, over which deterioration is observed, is close to that of circular pipes. Moreover, it is observed that when the value of eccentricity increases, the deterioration phenomenon becomes less pronounced and recovery of heat transfer coefficient occurs earlier, i.e. at lower buoyancy parameters compared to concentric annuli. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：222 / 233

页数：12

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