INTERACTION OF SURFACE RADIATION WITH FREE-CONVECTION IN A SQUARE CAVITY

被引：133

作者：

BALAJI, C ^{[1
]}

VENKATESHAN, SP ^{[1
]}

机构：

[1] INDIAN INST TECHNOL,DEPT MECH ENGN,HEAT TRANSFER & THERMAL POWER LAB,MADRAS 600036,TAMIL NADU,INDIA

来源：

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW | 1993年 / 14卷 / 03期

关键词：

RADIATION CONVECTION INTERACTION; RADIATION NUSSELT NUMBER; CONVECTIVE DROP; RADIOSITY;

D O I：

10.1016/0142-727X(93)90057-T

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A numerical investigation of free convection in a rectangular enclosure has been carried out based on Gosman's finite volume method with a 21 x 21 nonuniform grid. A radiation model has been included in the analysis to study the effect of surface radiation on the heat transfer characteristics of the enclosure. The model is general since it takes into account different emissivities for the side walls and for the top and bottom walls. The nonuniform grids for convection have been retained for radiation, notwithstanding the fact that the evaluation of view factors becomes highly tedious. The view factors are evaluated by Hottel's crossed-string method. Nonuniform grids for both convection and radiation routines ensure grid compatibility and yield convergent solutions. The model has thrown light onto the importance of surface radiation even at low emissivities and temperature levels and provides an explanation of the discrepancies between the experimental and theoretical correlations. A parametric study of surface radiation effects is also presented.

引用

页码：260 / 267

页数：8

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