Flow and heat transfer characteristics of supercritical COb>2b> in a natural circulation loop

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• 作者：Yuhui Cao^a ; ¹ ; Xin-Rong Zhang^b ; ^{scho@mail.doshisha.ac.jp} ; ^{zhxrduph@yahoo.com}
• 关键词：Carbon dioxide ; Supercritical fluid ; Heat transfer ; Natural circulation loop
• 刊名：International Journal of Thermal Sciences
• 出版年：2012
• 期刊代码：94_12900729
• 类别：et
• 出版时间：August, 2012
• 卷：58
• 期：Complete
• 页码：52-60
• 文件大小：918 K

摘要

Owing to the environmentally benign nature and the special property variation at supercritical pressure, COb>2b> attracts considerable attention in both science and engineering. The COb>2b> utilization is regarded as a sustainable way in long term and has become an important global issue. In the present study, a two-dimensional numerical model is used to study the convective flow and heat transfer characteristics of supercritical COb>2b> natural circulation in a uniform diameter rectangular loop. Parametric influences of the heat sink temperature, the inclination angle of the loop and the temperature difference on the convection motion and heat transfer performance have been studied. For a given temperature difference, the heat sink temperature has great effect on both flow and heat transfer performance. Increasing the inclination angle decelerates the convective flow and heat transfer processes due to the gradual decrease in buoyancy. With the increase of the temperature difference, both the flow rate and heat transfer performance are found to initially increase, reach a peak, and then decrease gradually. The underlying physics is explored.