Optimum wall-to-wall spacing in solar chimney shaped channels in natural convection by numerical investigation

被引：100

作者：

Zamora, B. ^{[1
]}

Kaiser, A. S. ^{[1
]}

机构：

[1] Univ Politecn Cartagena, Dpto Ingn Term & Fluidos, Cartagena 30202, Spain

来源：

APPLIED THERMAL ENGINEERING | 2009年 / 29卷 / 04期

关键词：

Natural convection; Solar chimney; Geometrical optimization; Turbulent flow; Numerical simulation; HEAT-TRANSFER; MODEL;

D O I：

10.1016/j.applthermaleng.2008.04.010

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A numerical study on the laminar and turbulent flows induced by natural convection in channels, with solar chimney configuration, for a wide range of Rayleigh number, several values of the relative wall-to-wall spacing and different heating conditions has been performed. The low-Reynolds k-omega turbulence model has been employed to simulate the turbulent cases. Numerical results for the average Nusselt number and the non-dimensional induced mass-flow rate have been obtained for values of Rayleigh number varying from 10(5) to 10(12) for symmetrically, isothermal heating. For this heating condition, a correlation for the thermal optimum aspect ratio has been presented. The sudden change reached in the flow pattern for given conditions drives to obtain a different behavior of the optimum aspect ratio that maximizes the mass-flow rate with respect to the thermal optimum aspect ratio. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：762 / 769

页数：8

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