Transition to unsteady natural convection flow in a prismatic enclosure of triangular section

被引：16

作者：

Cui, Huimin ^{[1
,2
]}

Xu, Feng ^{[1
,2
]}

Saha, Suvash C. ^{[3
]}

机构：

[1] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

[2] Beijings Key Lab Struct Wind Engn & Urban Wind En, Beijing 100044, Peoples R China

[3] Queensland Univ Technol, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2017年 / 111卷

基金：

中国国家自然科学基金;

关键词：

Transversal roll; Longitudinal roll; Rayleigh number; Prismatic enclosure of triangular section; HEAT-TRANSFER; BOUNDARY-CONDITIONS; 3-DIMENSIONAL SIMULATION; NUMERICAL-SIMULATION; ATTIC SPACE; AIR-FLOWS; SUBJECT; CAVITY;

D O I：

10.1016/j.ijthermalsci.2016.09.008

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Natural convection in a prismatic enclosure of triangular section with the top cooling and the bottom heating is investigated using three dimensional (3D) numerical simulations for a wide range of Rayleigh numbers from 10 degrees to 1.25 x 10(6). The numerical result has been compared with the experiment. The development of natural convection flows in the cavity following sudden heating and cooling involves three stages: an initial stage, a transitional stage and a fully developed stage. Transition to unsteady natural convection flow in the fully developed stage, dependent on the Rayleigh number, is described. The flow structure including transversal and longitudinal rolls is characterized and the corresponding mechanism is discussed. The critical Rayleigh number for the transition to unsteady natural convection flow is obtained. The dependence of heat transfer on the Rayleigh number is quantified. (C) 2016 Elsevier Masson SAS. All rights reserved.

引用

页码：330 / 339

页数：10

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