Experimental study on heat transfer of supercritical carbon dioxide in a long silica-based porous-media tube

详细信息    查看全文

• 作者：Jui-Ching Hsieh ; David T. W. Lin ; Bo-Heng Lee ; Ming-Che Chung
• 刊名：Heat and Mass Transfer
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：53
• 期：3
• 页码：995-1004
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics, Heat and Mass Transfer; Industrial Chemistry/Chemical Engineering; Thermodynamics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-1181
• 卷排序：53

文摘

The heat transfer phenomena of supercritical carbon dioxide were experimentally investigated in a vertical tube containing silica-based porous media. The experiment was conducted at various levels of static pressure, flow rates, and initial wall temperatures as well as with silica sand of porous media in a long test section to study the heat transfer characteristics of supercritical carbon dioxide (CO<sub>2sub>). The results indicated that the average heat transfer coefficient and outlet temperature at an initial wall temperature of 150 °C were higher and lower than that of 200 °C. The heat transfer performance was significantly influenced by flow rate of supercritical CO<sub>2sub>. The porous media was provided large heat exchange surface between particles and CO<sub>2sub> to increase the heat transfer coefficient, especially when small diameter of particles. When the inlet temperature was higher than the pseudocritical temperature, the heat transfer coefficient sharply dropped when x/L ≥ 0.5, because of the development of a thermal boundary and the decrease of CO<sub>2sub> thermophysical properties of CO<sub>2sub> in a far pseudocritical temperature. When the pseudocritical temperature was higher than the inlet temperature of the fluid, the local heat transfer coefficient was affected by a thermal boundary and thermophysical properties of CO<sub>2sub> in pseudocritical point at a higher initial wall temperature or lower supercritical pressure when x/L ≤ 0.75; only the thermophysical properties of supercritical CO<sub>2sub> in pseudocritical point played a pivotal role when x/L > 0.75 at a lower initial wall temperature or higher supercritical pressure. In the present study, the supercritical pressure of 10.5 MPa constituted an optimal operating condition for supercritical CO<sub>2sub> a long silica-based porous-media tube because of the high heat transfer performance at 150 and 200 °C.