Multicellular laminar natural convection in vertical bent cavities

被引：0

作者：

Lartigue, B. ^{[1
]}

Lorente, S. ^{[1
]}

Bourret, B. ^{[1
]}

机构：

[1] Université Paul Sabatier, LESETH, 118, route de Narbonne, 31062 Toulouse cedex 4, France

来源：

International Journal of Heat and Technology | 2001年 / 19卷 / 01期

关键词：

Aspect ratio - Computer simulation - Laminar flow - Prandtl number - Pressure drop;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This study concerns the heat transfer inside double glazing windows which bend because of extreme climatic conditions (an important temperature difference leads to a pressure drop inside the cavity which results in the bending of the plates). Four reference plane cavities of aspect ratio A = 40 with Rayleigh numbers varying within the laminar flow regime are considered. In each case, the influence on the convective heat transfer of the vertical surfaces bending inward is studied. A two-dimensional numerical simulation based on a finite volume method is performed to investigate natural convection in the air-filled cavities. Important curvature creates two patterns in the enclosure. In the core, heat is transferred more by conduction whereas in the ends multicellular convection occurs. A coefficient of heat transmission K is defined. K strongly increases with curvature. These results will be used to supply correlation allowing to take into account the curvature in the determination of the global coefficient of heat transmission U-factor established from ASHRAE.

引用

页码：51 / 60