热力发电2025，Vol.54Issue(10)：93-104,12.DOI:10.19666/j.rlfd.202504068
水平管内超临界二氧化碳类沸腾传热数值模拟:全周与侧半周加热对比研究
Numerical simulation on pseudo-boiling heat transfer of supercritical carbon dioxide in horizontal tube with circumferential heating and semicircle heating
摘要
Abstract
Supercritical carbon dioxide(S-CO2)in horizontal tube with circumferential heating and semicircle heating is investigated numerically based on pseudo-boiling theory.The phase distribution of supercritical fluid in the tube is obtained.It is found that the heat transfer performance of supercritical fluid is determined by the thickness of vapor-like film on tube,which can be characterized by supercritical K number,involving the balance between evaporation momentum force and inertia force.The increasing thickness of local vapor-like film can trigger heat transfer deterioration.There are both overshoot wall temperature along the flow direction and non-uniform wall temperature in the circumferential direction.The emerging condition of heat transfer deterioration can be accurately predicted by supercritical boiling number SBO.Under working conditions where the pressure p is 8～20 MPa,and the range of mass flux G and heat flux density qw is 300～1 300 kg/(m2·s)and 42～500 kW/m2 respectively,compared with the circumferential heating tube,the semicircle heating tube behaves thinner vapor-like film to enhance the heat transfer performance.The critical SBO to heat transfer deterioration rises from 6.179×10-4 to 9.798×10-4.Furthermore,the semicircle heating tube keeps more uniform vapor-like film,the maximum temperature difference between the top and bottom generatrix of tube wall changes from 116.3 K to 57.1 K.Due to the ability to repress heat transfer deterioration and non-uniform wall temperature,semicircle heating is recommended to ensure the safe operation of horizontal heat exchangers in advanced supercritical CO2 system.关键词
超临界二氧化碳/类沸腾/传热恶化/半周加热Key words
supercritical carbon dioxide/pseudo-boiling/heat transfer deterioration/semicircle heating引用本文复制引用
周纪龙,于博文,钟锡镇,齐会,徐进良,谢剑..水平管内超临界二氧化碳类沸腾传热数值模拟:全周与侧半周加热对比研究[J].热力发电,2025,54(10):93-104,12.基金项目
河南省基本科研业务费支持项目(2023KY32) （2023KY32）
国家自然科学基金重点项目(52130608)Basic Scientific Research Fund of Henan Province(2023KY32) （52130608）
Key Project of National Natural Science Foundation of China(52130608) （52130608）
