TRANSIENT CHARACTERISTICS OF COUPLED THERMAL RADIATION AND NATURAL-CONVECTION IN A 3-D CYLINDRICAL CAVITY CONTAINING A HEATED PLATE

被引：0

作者：

Wang, Tianxiang ^{[1
]}

Qiu, Yinan ^{[1
]}

Lei, Gang ^{[1
]}

Zhang, Jinjin ^{[2
]}

Huang, Yonghua ^{[2
]}

Yang, Guang ^{[2
]}

机构：

[1] State Key Lab Technol Space Cryogen Propellants, Beijing, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai, Peoples R China

来源：

THERMAL SCIENCE | 2023年 / 27卷 / 3B期

基金：

中国国家自然科学基金;

关键词：

natural-convection; radiation; numerical simulation; dynamic characteristics; heated plates; FLOW;

D O I：

10.2298/TSCI220523135W

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this study, a numerical study of transient combined natural-convection and surface radiation in a cylindrical cavity with a heated plate placed inside is carried out using the open-source platform OpenFOAM. The effects of the Rayleigh number (105 < Ra < 107), inclination angle (0o < & phi; < 90)o, and surface emissivity (0 < & epsilon; < 1) on the velocity components, temperature field, and Nusselt number are investigated in detail. Results show that the Rayleigh number has a greater effect on the radiative heat transfer than on natural-convection. Radiative heat transfer increases monotonously with the increase of surface emissivity, and its contribution could be over 50% of the total heat transfer rate. The inclination angle of the plate affects the flow structure, but the difference in total Nusselt number is less than 10% for various inclination angles. Results in this study provide insights into the transient characteristics of coupled thermal radiation and natural-convection in a 3-D cavity and will guide the optimal design of related devices.

引用

页码：2377 / 2390

页数：14

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