物理学报Issue(5)：1-7,7.DOI:10.7498/aps.64.054401
水平螺旋管内超临界CO2冷却换热的数值模拟∗
Numerical study of co oling heat transfer of sup ercritical carb on dioxide in a horizontal helically coiled tub e
摘要
Abstract
In the present study, cooling heat transfer of supercritical CO2 in a horizontal helically coiled-tube 4 mm in diameter, 2000 mm in length, a pitch of 10 mm and 0.1 in curvature is numerically investigated with RNG turbulence model. Influences of mass flow rate, heat flux and pressure on heat transfer of supercritical CO2 are studied. The characteristics of the flow and heat transfer are compared with those in a horizontal straight tube. Results show that the secondary flow and heat transfer coefficient in a helically coiled tube is obviously larger than in a horizontal straight tube. The heat transfer coefficient of supercritical CO2 increases with increasing mass flow rate, and the heat transfer coefficient increases slightly as the heat flux increases in the gas-like region, while the heat transfer coefficient is unaffected by heat flux in the liquid-like region. The peak of the heat transfer coefficient decreases and shifts to a higher temperature region as the pressure increases.关键词
超临界二氧化碳/数值模拟/螺旋管/冷却换热Key words
supercritical CO2/numerical study/helically coiled-tube/cooling heat transfer引用本文复制引用
徐肖肖,吴杨杨,刘朝,王开正,叶建..水平螺旋管内超临界CO2冷却换热的数值模拟∗[J].物理学报,2015,(5):1-7,7.基金项目
国家自然科学基金(批准号:51206197)、中央高校基本科研业务费专项资金(批准号：CDJZR12140032)和重庆市自然科学基金(批准号：CSTC2011BB6094)资助的课题.@@@@* Project supported by the National Natural Science Foundation of China (Grant No.51206197), the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. CDJZR12140032), and the Natural Science Foundation of Chongqing, China (Grant No. CSTC2011BB6094) （批准号:51206197）
