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传热学
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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

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传热学

DOI: 10.1615/HeatTransRes.2015008253
pages 1065-1079

EXPERIMENTAL RESEARCH ON COUPLED HEAT TRANSFER OF A HEAT SOURCE ENCAPSULATED INTO A SUBATMOSPHERIC HYPOBARIC CHAMBER

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
Xin-Lin Xia
School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001, P.R. China

ABSTRACT

In this work, an experimental setup was built to measure the coupled heat transfer mechanism of natural convection and radiation in a low-pressure enclosure with a heating cubic element, in which the pressure varied from 90 kPa to 0.1 kPa. The cubic element was heated by six attached electrical heating plates. An infrared thermography was used to measure the wall emissivities, based on which the net heat radiation flux between the component and hypobaric chamber was calculated by the Monte Carlo method. Eventually, the relative magnitude of natural convection and surface radiation can be estimated in the form of heat flux ratio, which was useful for better understanding the heat exchanger process in the low pressure environment. Experimental results provided the temperature distribution on the surface of the element, and heat dissipation was demonstrated. Considering the variable density of air at a low pressure, the average Nusselt numbers in the above pressure range could be correlated well with the Rayleigh number into three correlations, providing valuable reference for the engineering design calculations and thermal analysis.


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