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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Interaction Effects between Surface Radiation and Sub-atmosphere Natural Convection in Multi-Heat Sources Enclosures

Han Wang
Harbin Institute of Technology, College of Energy, Nanjing University of Technology, Nanjing, People's Republic of China

Chuang Sun
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, People's Republic of China

Han Wang
School of Energy Science and Engineering Nanjing Tech University, Nanjing, People's Republic of China

Heping Tan
Key Laboratory of Aerospace Thermophysics of MIIT, School of Energy Science of Engineering, Harbin Institute of Technology, Harbin 150001, China

DOI: 10.1615/IHTC15.ncv.009319
pages 5327-5333


Palavras-chave: Convection, Radiation, Sub-atmosphere

Resumo

Natural convection in rectangular enclosures in encountered in many engineering applications such as heating and cooling of rooms, solar collectors, cooling of electronic equipment etc. The problem of natural convection in a square enclosure with single heat source has been extensively investigated for various boundary conditions. However, in many practical situations, multi-heat sources existed in the cavity, and the interaction among heat sources could affect the temperature distribution and flow pattern in the enclosure. Especially in the sub-atmosphere environment, the surface radiation need to be considered due to reduced natural convection, which will be important for thermal analysis and design. In the present study, the interaction effects of surface radiation with natural convection in a classical model of multi-heat sources in sub-atmosphere enclosure will be numerically analyzed, with the pressure range from 101 kPa to 0.1 kPa. The walls of enclosure are set to be isothermal and constant heat flux, respectively. Heat transfer results for natural convection will be presented as heat transfer coefficients, and the ratio of natural convection and surface radiation will also be presented. The effect of various parameters such as pressure, heat power, emissivity and position will be investigated to understand the heat transfer and to facilitate the optimal design of cooling electronic equipment.

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