化工学报2019，Vol.70Issue(4)：1291-1299,9.DOI:10.11949/j.issn.0438⁃1157.20180695
垂直上升管内超临界CO2流动传热特性研究
Flow and heat transfer characteristics of supercritical CO2 in vertical tube
摘要
Abstract
The heat transfer characteristics of supercritical carbon dioxide in vertical upward tubes under uniform heating were studied experimentally. The inner diameter of the experimental section is 10 mm. The experimental parameters are: pressure 7.5—21 MPa, heat flux 50—413 kW·m-2, mass flux 519—1500 kg·m-2·s-1. The flow heat transfer characteristics in the riser tube were tested under uniform heating conditions. The effects of heat flux, pressure and buoyancy force on the heat transfer characteristics in the circular tube were analyzed. The results show that with the increase of heat flux the heat transfer deterioration occurs, and the peak point of wall temperature moves towards the inlet section. Heat transfer deterioration occurs when the fluid temperature is less than the pseudo-critical temperature and the wall temperature is greater than the pseudo-critical temperature. When increasing pressure, the deterioration of heat transfer is restrained due to the change of physical property tends to be gentle. Buoyancy forces are bad for heat transfer when heat transfer deterioration occurs. Based on the experimental data, the physical properties change and buoyancy influence on heat transfer are considered comprehensively, new supercritical carbon dioxide heat transfer correlations is established, within the range of the experiment condition, deviation from the mean and standard deviation of the predicted values and experimental values were 1.2% and 16.29% respectively.关键词
超临界二氧化碳/流动/传热关联式/实验/传热Key words
supercritical carbon dioxide/flow/heat transfer correlation/experiment/heat transfer分类
能源科技引用本文复制引用
朱兵国,吴新明,张良,孙恩慧,张海松,徐进良..垂直上升管内超临界CO2流动传热特性研究[J].化工学报,2019,70(4):1291-1299,9.基金项目
国家自然科学基金项目(21476036) （21476036）
国家科技重大专项(2016ZX0566005-002) （2016ZX0566005-002）
